LEDs Effect – Queendom-led light,led lighting,led lamp,LEDs factory

Where are High Power LEDs typically used?

QUEENDOM01 — Mon, 15 May 2023 09:53:16 +0000

High power LED is a type of LED that can generate higher lumen luminous flux than regular LEDs. This makes it more commonly used in lighting devices with high brightness requirements. So, where are High Power LEDs typically used?

Home lighting

In home lighting, High Power LEDs can be applied to interior and exterior decorative lamps such as chandeliers, spotlights, and floor lamps. These lighting fixtures need to generate colorful and bright light to achieve good visual effects and a comfortable atmosphere. The use of High Power LEDs can better achieve these effects and have higher light wave efficiency and lifespan.

High Power LED

Indoor and outdoor commercial lighting

High Power LEDs are gradually being used in various indoor and outdoor commercial lighting applications. Many shopping malls and public places use this type of lighting fixture to enhance the brightness and effectiveness of the space, in order to strengthen the brand image. In indoor lighting, high power LEDs can also be used for lighting on display shelves, product guide lights, billboards, landscapes, and more.

Plant cultivation lighting

With the advancement of technology, plant cultivation also requires lighting. Compared to traditional problems such as long natural light consumption and unstable effects, High Power LEDs can be applied to efficient plant cultivation. By selecting appropriate wavelengths and chromatography, plant growth can be stimulated and crop growth can be promoted. These High Power LEDs also have characteristics such as power saving, energy saving, and environmental protection.

In summary, High Power LEDs are suitable for various applications, which can improve efficiency, reduce energy loss, and better meet market demand. For efficient lighting and innovative fields, High Power LEDs have broad prospects and great application potential.

Imaging Principles of LED Optical Systems

QUEENDOM01 — Sat, 06 May 2023 03:32:25 +0000

Optical imaging is the process of converting optical information on an object into an image through an optical system. An optical system is composed of multiple optical devices, such as lenses, prisms, reflectors, etc., the most basic of which is a lens. The imaging principle of LED Optical Systems is based on the basic laws of light propagation, refraction, and reflection, and the imaging of objects is achieved through the combination of lenses and optical devices.

The imaging principle of LED Optical Systems can be divided into two situations: convex lens imaging principle and concave lens imaging principle.

The principle of concave convex lens imaging

The principle of convex lens imaging mainly involves the direction of the image. When the object is located on the left side of the lens focus, the image formed by the refraction of light through the lens is located on the right side of the lens; When the object is located on the right side of the lens focus, the image formed by the refraction of light through the lens is located on the left side of the lens. If the object is located at the focal point of the lens, the light rays after imaging will be parallel and there will be no deviation in the light path.

The principle of concave lens imaging is also similar. However, due to the spherical aberration of concave lenses, they are rarely used in practical applications.

Propagation of light path

The basis of imaging principle is the propagation of incident light along a traceable optical path. The factors that affect the optical path in LED Optical Systems include the refractive index of imaging optical devices, the possible scattering of light when passing through optical devices, and so on. We can predict the propagation and imaging of light in optical devices through classical geometrical optics or radiation metrology.

The imaging principle of LED Optical Systems is based on the basic laws of light propagation, refraction, and reflection, and the combination of optical devices such as lenses is used to achieve the imaging of objects. Understanding and mastering the imaging principles of LED Optical Systems is of great significance for the design and application of LED Optical Systems.

High power LED street lighting application

queendomlamp — Sat, 18 Feb 2023 09:51:11 +0000

High power LED street lighting application

Driven by various emerging application fields, the scale of the LED market has been rapidly improved in recent years. Its application fields have evolved from simple electrical indications and LED-based displays to LCD green light sources, landscape lighting, Interior lighting, automotive lighting and other fields. As LED has the characteristics of long life, pollution-free and low power consumption, in the future, LED will gradually replace fluorescent lamps and incandescent lamps for the next generation of green lighting sources.

In this chapter, we explain the application of LED) in various territories, including the application of LED in the field of urban lighting, the application of LED display, the application of LED in home lighting, automotive lighting, and various special LED light sources. . The application of LED is very wide. It can not only provide bright lighting, but also save energy, which is the development direction of future lighting.

LED light post with beautiful sky background

The application of high-power LED in street lighting

Due to the rapid development of high-power LEDs in recent years, the current luminous efficiency can reach 80-100 ImW. Therefore, a large number of high-power LEDs are used as green energy advertising equipment, green energy landscape lighting, park lighting, community lighting and lighting between buildings. It not only saves energy, but also environmental protection, and can save investment. This section introduces the wind-solar complementary power LED designed and manufactured by Wuxi Zhongke Green Energy Technology Co., Ltd., which can be used for urban street lighting.

1.1 City street lighting

City street lights are common lighting tools in daily life, which bring light to night life (as shown in Figure 6.1). Beautiful street lights can also decorate the city at night. However, street lamps consume a lot of power, and because of the long low-voltage transmission lines of street lamps, not only the street lamps themselves consume power, but also the power consumption of the transmission lines and the wires themselves. At present, the energy-saving work of street lamps has been included in the important work of governments at all levels and street lamp management departments.

1.2 Solar lighting

In recent years, a large number of new technologies and products of book energy have appeared in the urban Weilu lighting industry. Among them, Dayang energy urban street lights do not need electricity: therefore, they have the advantage of not having to install cables. However, when solar energy is used to light high-pressure or low-sodium lamps, because it is an inductive negative line, if the voltage is increased by the electric energy converted by solar energy, many circuits must be converted: this also consumes energy.

If you use solar energy to light up the LED street lights, although the sun can light up after charging the battery, there is no guarantee that the LED will continue to light if there is no sunlight for five or six consecutive days. Therefore, wind power generation is used for external use, and there is no sunlight. In the case of, it refers to the supplementary energy of wind power, which can still light up

1.3 Wind-solar complementary power LED intelligent street light

The LED intelligent street lamp uses solar energy and wind energy as driving energy, and its working principle.

If you encounter continuous rainy days, you can work normally for more than 4 days (up to 7 days)

The height of the street lamp is 6~12m, which can be used for main and secondary roads, as well as for park and community lighting.
According to needs, it can be set to automatically switch street lights, and also can be set to full power all night, half power late at night, 4 to 8 hours timing lights off and other power options.
The charging circuit can be set with overload protection to provide constant current for lighting the LED.

After the company’s field test and trial, when the wind speed is high (above level 4), the wind turbine generates a large amount of electricity (more than 70%), and the charging speed is fast (the battery can be fully charged in 4 to 10 hours for 3 days use) . This complements each other with solar panels and can meet usage requirements.

According to the actual measurement, the illuminance of 35W power LED is the same as 70W high pressure sodium lamp, but the LED emits white light, so the visual effect is obviously better than the yellow light emitted by sodium lamp. Table 6.1 compares the economic costs and technical indicators of conventional street lamps and wind-solar complementary power LED street lamps.

From the above data, the price and performance of high-power LED street lights are still very competitive. With the advancement of technology, the luminous efficiency of high-power LED street lamps will continue to increase. Therefore, under the same power conditions, the street lights will be brighter, and the price will continue to fall. If the heat dissipation and other aspects are well designed, the life of this street lamp is guaranteed, so the use of LED as street lamp lighting will continue to spread. LED street lights lit by solar energy as a power source will find practical applications in the future.

Application of LEDs in traffic lights

queendomlamp — Sat, 18 Feb 2023 09:33:31 +0000

Because LED has the advantages of high brightness, power saving and long life, it has been widely used in traffic signal lights. According to statistics, there are about 20 million traffic lights in the world. In 2000, there were about 400,000 traffic lights in Pingtian LED around the world. In 2001, it reached 1 million, and the growth rate reached 150%. It is estimated that 2 million new LED traffic lights are added globally every year. Based on an update cost of about US$500 per seat, there will be a US$1 billion market for LED consumption in urban LED traffic lights in the world every year in the future.

At night, high-luminosity LED urban traffic lights have also begun to be applied. Traffic signals use LED light-emitting diode light sources. Each intersection requires 12 yellow and green signal lights, plus 24 pedestrian crossing warning lights (8 sets), a total of 36, of which 12 are blue-green signal lights, so each intersection needs 2400 Only blue and green LEDs are highlighted. In 2000, there were 663 cities in China, including 37 megacities, 51 large cities, 216 Zhongbo cities, and 359 small cities. With an average of 500 intersections in each city, the national Tongai needs about 800 million high-brightness blue-green LEDs.

traffic light

With the expansion of cities and the acceleration of urbanization, municipal construction facilities are also a large space. Small cities and even towns need equipment, including highway entrances and exits, and traffic lights at intersections of superhighways. It is estimated that this is a market of more than 1.5 billion yuan. With the continuous improvement of energy saving, environmental protection and traffic safety requirements, and the continuous decline of LED prices, more and more LEDs will be used to replace old lights and traffic lights. .

Device design of LED traffic lights

Using LED traffic lights to replace traditional incandescent lamps can save more than 80% of electricity, and its optical performance is better than that of 100W incandescent lamps. In order to ensure that the service life of traffic lights can exceed 5 years, it is suggested that the following technical measures should be taken when designing LED traffic lights.

In the signal lamp, through-hole LEDs are selected, and LED chips with higher brightness are used. It is best to use copper brackets for the selected LEDs. When designing the printed circuit board, the area of the copper clad laminate should be larger, which is conducive to the heat dissipation of the LED (the heat is dissipated by the copper strip of the circuit board).

When selecting LED, its design index should be 20% brighter than that required by traffic signal lights. Using reflective cup technology can improve the light output effect of signal lights.

The driving current should adopt a reliable constant current power supply. When the voltage changes within the range of ± 20%, the current change is controlled within ± 1 mA. Because the forward voltage of the LED decreases with the rise of temperature, if the resistance step-down, capacitive step-down or constant voltage method is used, the current will increase accordingly, which will cause the temperature to rise, resulting in a vicious cycle until the LED is damaged.

There should be room for the current that each LED bears, which is less than the current value of 20mA usually used at room temperature. For example, the red and yellow LEDs use 17~18 mA, and the blue and green LEDs use about mA. From the limit operating current of the LED and the ambient temperature It can be seen from the relationship that for the red and yellow LEDs, when the temperature rises to 80C, the limit current is only 23, and when the temperature rises to 70C, the limit current is only 10 mA, which exceeds the limit allowable current of these two LEDs. The LED is about to break.

traffic light

Technical standards for LED traffic lights

So far, LED traffic lights have circular red, green, and yellow lights, arrow-shaped green lights, and red, yellow, and green lights for sidewalks. The technical standards of these types of lamps are different, but their light intensity and luminance values are all measured at the viewing angle in the horizontal direction. On the horizontal light ground, there are 5” on both sides of the horizontal angle, 10° on both sides of the horizontal angle, 15” on both sides of the horizontal angle, 20” on both sides of the horizontal angle. 5°, depression angle of 10″, and depression angle of 20* to measure the optical indicators of famous points. As for the color of signal lights, the standards of different countries are also different.

Due to the harsh environmental conditions of traffic lights, high and low temperature tests should be carried out in cycles of -40~60C. The requirements for the waterproof conditions of the traffic signal lights are also relatively high. Under a certain water pressure, the traffic signal lights can be impacted from all sides, and it is necessary to ensure that no water can enter. Dustproof is also another requirement for traffic lights, that is, the surface lens should not be stuck with dust. For the above standards, you can check the specific test indicators of the traffic department. There is a research institute in the traffic department that is responsible for the testing and inspection of traffic signal indicators.

At present, the LEDs used in traffic lights are different. There are 0.5 mm red, green and yellow single-tube combinations. Because the luminous flux emitted by a single LED is small, 100-300 LEDs are usually used to distribute them evenly on the entire light-emitting surface. superior. With the improvement of the light output efficiency of a single LED, it is also possible to use only Shierdun LEDs to form a signal light.

For LEDs used as traffic lights, it should be designed according to relevant technical indicators and basic parameters such as voltage, current, and luminous flux of a single LEDE. Now there are many technical materials for designing traffic lights, which can be consulted by relevant professional and technical personnel.

LEDs car light source application

queendomlamp — Sat, 18 Feb 2023 09:07:47 +0000

Many countries have invested a lot of manpower here to study the application of LED in automobiles. The cars of the time are already equipped with LED lighting equipment, for example, the 200 Cadillac period 5 state-owned cars.

Features of automotive LED

Because LED has the advantages of energy saving, long life, maintenance-free, explosion-proof, no fear of vibration, easy to control new text, etc., plus the cold light characteristics of the LED itself, the shape of the lamp will not be deformed due to long-term heat, thereby improving the entire set of lights Life. Especially the LED light-up time is fast (the incandescent lamp of batch 1 is 0.7~1s faster), so when using LED as the brake light, if the car in front is printed with the car behind the car, it will be seen 0.7~1s earlier than the incandescent brake light To the signal. The speed of driving on the highway is 100 km/h, which can be braked 20 m ahead of the incandescent brake lights, thus preventing the occurrence of collisions between two vehicles and reducing hidden traffic hazards.

At present, LEDs are widely used in car taillights, brake lights, direction lights, indicator lights, reversing order, car ceiling lights, reading lights, as well as handles, car locks, switches, cup holders, seat belt buckles, mirror side sugar cars With the rapid development of technology, the price of LED will be greatly reduced, so the use of LED in automobiles will become more and more popular.

LED application

2 Power supply for automotive LED

The LED on the car uses the battery on the car as the power supply. The passenger battery on the car changes greatly. The voltage of the passenger battery that is not charged in the leisure time may drop to 10V. After fully charged, the power supply voltage of the oil can be Up to about 14V. The LED lamp must realize voltage stabilization or steady current power supply, so the input voltage of the car LED should be processed, and the voltage stabilization circuit should be designed to stabilize the voltage of 10~14V to 12V. Now there are models with this kind of module on the market. LED, like the 1W LED module made by Fujian Cangle Electronics Company, its input voltage is 10~14V, output constant current voltage is 12V, it is usually suitable for use in automobiles.

3 Examples of automotive LEDs

Recently, the new car LED lights are equipped with a kind of LED chassis lights on the car chassis, which can emit dazzling lights at night. New car decoration products with this effect have been popular at home and abroad. It integrates safety and decoration. At night, foggy, rainy, cloudy, and poorly visible roads, it can provide pedestrians or other vehicles with driving or parking location marks, thereby reducing potential accidents . This will bring greater market space for LEDs.

Automotive LEDs are most suitable for the backlight display of digital instrument indicators, front and rear turn signals, brake indicators, reversing lights, anti-fog lights, reading lights, etc., for the angle, color difference, brightness, voltage, light attenuation, and heat dissipation of these lights , UV protection and reliability requirements are very high. Only by meeting these requirements can automotive LEDs be truly industrialized.

Car light

Ten car maintenance lights

Recently, there is a new car maintenance lamp on the market (as shown in Figure 6.4), which uses φ mm white LED. Usually, Yisheng car maintenance lamp is composed of 30 or 60 LEDs, which are used as spare parts for cars. When the car is on the road at night In the event of a malfunction, this repair lamp is very useful.

If there is a failure in the head of the car, the maintenance lamp can be directly connected to the passenger battery to light it as a maintenance lamp. If a malfunction occurs inside the car yang, it can be connected to the cigarette lighter in the cab to light up. This kind of light can also flash yellow light, which can be used as a reminder or alarm for passing cars.

It is forbidden to use the above content without the author’s authorization, and reprinting must note the source of this content or the consent of the publisher

pcr led parameters

queendomlamp — Wed, 18 Jan 2023 15:19:01 +0000

For the irradiation end of the fast PCR instrument, if a Through hole Round LED with a diameter of 5/8/10mm is used, the optimized optical path is shown in Figure

1. The light emitted by the through hole LED first passes through a plano-convex glass lens, then filters the light through a filter, and finally converges the light into the optical fiber through a glass spherical lens. Plano-convex glass lens and filter, glass ball lens through optical fiber, numerical aperture NA = 0.56. Spacing between filter and glass ball lens = 3-5mm. The light spot on the fiber end face is shown in Figure

2. ZEMAX simulation found that the energy utilization rate of light is about 25.658%, compared with SMD LEDs (the energy utilization rate of light is about 85%)

Figure 1 Light path at the irradiated end (using Through hole LED)

Figure 2 Spot on the fiber end face

The above simulations are based on a wafer of medium to high power chips. Assuming that the thickness of the LED chip is 120 μm, all six sides of the wafer are illuminated. The wafer is in contact with the bottom of the holder’s reflective cup.

The drive current of the Through hole LED is expected to be 100mA. If it is greater than 100mA, the light intensity at the moment of lighting is high. If it is lower than 100mA, the light intensity is not enough to excite the fluorescence of low-concentration reagents, which will affect the sensitivity.

In terms of wavelength selection for through hole LEDs, the following are preferred:

1. Peak wavelength 430nm;

2. Peak wavelength 470nm;

3. Peak wavelength 520nm;

4. Color temperature 4000K full-spectrum white light;

5. Peak wavelength 630nm, or color temperature 3000K

6. The peak wavelength is 740nm.

Application of Infrared IR LED in Infrared Camera

queendomlamp — Sun, 15 Jan 2023 06:50:33 +0000

Application of Infrared IR LED in Infrared Camera

With the increasing demand for night vision monitoring in security video surveillance system engineering, infrared cameras have entered the mainstream market of cameras, and sales are increasing day by day. Problems in the application of infrared night vision technology are gradually exposed.

In fact, night vision technology is a photoelectric technology that realizes night observation by means of photoelectric imaging devices. It includes two types of low-light night vision and infrared night vision: low-light night vision technology is a night vision technology with an image intensifier tube, which actually enhances the faint target image illuminated by night skylight for observation photoelectric imaging technology. Here we mainly talk about active infrared night vision technology, which is a night vision technology that implements observation by actively illuminating and using the infrared light reflected by the target to reflect the infrared source. The corresponding equipment is an active infrared night vision device, and the actual core is an infrared camera.

The infrared light source, the camera composed of the non-direct-view photoelectric imaging device CCD or CMOS image sensor as the core, and the lens required for the imaging screen are the three major factors that dominate the night surveillance effect of the infrared camera.

Infrared IR LED

Selection of infrared light source

Infrared light is an invisible light with a wavelength greater than 780nm. Generally, there are the following three methods for generating such invisible light.

①. Directly use the infrared light emitted by incandescent lamp or xenon lamp. That is, install visible light filters on these two lamps to filter out visible light and only let invisible infrared rays emit;

②. Use infrared light-emitting diodes (LEDs) or LED arrays to generate infrared light. This device generates infrared light through the recombination of electrons and holes in a gallium arsenide (GaAs) semiconductor;

③. Using infrared laser diode LED can also be used as infrared light source. However, it needs to excite or pump electrons in a lower energy state to a higher energy state, and maintain stimulated emission of infrared light through a large number of particle distribution reversals and resonance.

The first type of light source is a thermal infrared light source. Its biggest advantage is that it can be made into a relatively large power and a large irradiation angle, so the irradiation distance is long. Its biggest disadvantage is that it contains visible light components, that is, there is a red burst, and its service life is short. If it works 10 hours a day, it can only be used for 5000 hours for more than a year. If the heat dissipation is not enough, the service life is even shorter. In order to improve the service life of the thermal radiation infrared lamp, it is necessary to use a light control switch circuit to reduce its working time. In addition, a delay switch circuit is added to prevent the interference of ambient light.

The second is an infrared lamp composed of a semiconductor gallium arsenide light-emitting diode array, especially the array-type integrated light-emitting chip LEDArray that is now developed and produced using new technology. The optical output of one LED-Array has reached 800mw-1000mw, and it has become a replacement product of ordinary LEDs. The half-power angle of the LED-Array is 10-120° (variable angle).

Since the LED-Array is a highly integrated LED, and its volume is only the size of a penny, it can evenly illuminate the entire space indoors, and its lifespan is 50,000 hours. It was originally used on aviation aircraft. In recent years, due to the development of the civilian night surveillance market, LED-Array has gradually entered the civilian market and has become an ideal choice for high-quality night surveillance.

Although infrared LED and LED-Array have eliminated thermal infrared light sources, for the monitoring of ultra-long-distance scenes over 1km, infrared LED light sources should still be selected. Because semiconductor lasers have the characteristics of higher brightness and stronger directionality than LEDs.

Generally, the following points should be paid attention to when choosing an infrared light source.

There should be a margin in the distance selection of infrared lamps

When choosing an infrared lamp, pay special attention to the gap between the nominal distance and the actual irradiation distance. Because the nominal viewing distance of some manufacturers is often too large, it is necessary to conduct actual tests when selecting the irradiation distance of infrared lamps, and to leave sufficient margin to make the illuminance of the observed scene reliable.

A light source driven by a steady current source should be selected

Because LED is a current-driven device, its luminous brightness and power are proportional to the driving current, not the voltage. Therefore, in order to keep the luminous intensity constant, a light source driven by a steady current source must be selected.

Choose a light source with good heat dissipation

Because luminous tubes have heat and heat dissipation problems, especially light sources with high power and long distances generate a lot of heat, so it is necessary to choose a light source with good heat dissipation to ensure stable and reliable work.

It is necessary to choose an infrared light source with a power supply circuit with a light-controlled switch automatic control circuit and separated from the light board

Because the power supply circuit of the infrared lamp is not separated from the lamp board, the heat generated by the light-emitting tube will affect the performance of the components of the power supply circuit, resulting in unstable light emission of the light-emitting tube. With this light-controlled switch circuit, the infrared The lights are off during the day and on at night.

Infrared lamps should be selected according to the monitoring distance

Because the infrared light-emitting diode LED can be installed on the lens, it can be used with a sensitive infrared camera, or directly installed on the casing around the interface between the camera and the lens. Obviously, these two types of devices have fewer infrared LEDs, and their irradiation distance is definitely not as far as that of a single infrared LED lamp. Generally, if it is more than 50m, it is better to choose a separate infrared lamp. In addition, LED is mostly used for night vision lighting of monitoring scenes with a distance of more than 1km, but the beam of LED is thin and strong. In order to make the infrared beam illuminate a certain range of scenes, use Sometimes it is necessary to expand the beam through a beam expander lens.

Second, the choice of camera

At present, there are two types of photosensitive devices in cameras: CMOS and CCD. Like the CCD, the CMOS image sensor chip also responds to infrared light waves, but its sensitivity in the range of 890-980nm is much higher than that of the CCD image sensor chip, and the attenuation gradient is slower as the wavelength increases. With the rapid development of CMOS image chips, their noise signals have been further reduced, and star-level CMOS cameras have also appeared on the market. Therefore, it is not necessarily limited to the choice of CCD cameras, but can be selected by making full use of their respective advantages. In general, the selection points of infrared cameras are as follows.

A low-illuminance camera should be selected, and its illumination requirements are generally ≤0.02Lux

Some camera manufacturers or sellers falsely report the minimum illuminance, which greatly reduces the effective distance of night vision, so it is best to test it in detail.

Intensified cameras such as moonlight level and starlight level can work in very dark conditions, but some places with small reflective coefficients still cannot meet the requirements, such as deserts, green lands, forest areas, etc. In this case, it is necessary to use a low-light night vision camera that is directly coupled by a high-performance image intensifier and a CCIR black and white CCD through a fiber panel and a light cone. In short, the lower the illuminance, the better. Since it is not yet standardized, the minimum illuminance claimed by the manufacturer cannot be trusted. It is better to test it under practical conditions. Usually, the illuminance requirement is generally ≤0.02Lux.

The larger the size of the selected infrared camera image sensor, the better

Because 1/4CCD cannot be used for the effective distance of infrared night vision above 15m, because the luminous flux of 1/4CCD is only 50% of 1/3CCD. The larger the size of the CCD, the larger the received luminous flux; the smaller the size of the CCD, the less the received luminous flux. Therefore, choose 1/2 of the CCD for the night vision camera, and 1/3 of the CCD can be tested if it is feasible, but you must not choose 1/4 of it.

Infrared cameras must have automatic electronic shutter and automatic gain control (AGC) functions

Because of these functions, the signal can be adjusted to a better state to meet the observation effect.

Choose a CMOS ultra-miniature camera for concealed occasions

Because low power consumption, high integration, and small size can only be achieved by CMOS image sensors, it can be made into a CMOS camera with the size of a shirt button or a suit button. Coupled with the miniaturization of the corresponding infrared light source and the introduction of high-efficiency batteries, the third eye will be ubiquitous. In this way, with a pair of night vision glasses and a hat equipped with an infrared light source and a CMOS ultra-miniature camera, the night will be like the day. Clearly, this will change the face of our entire social life.

Choose the supporting small power supply for the camera

The selection of the power supply of the camera should pay attention to the following two points

Select a regulated power supply. Because the mains AC220V is unstable, if only one AC-to-DC 12V transformer is selected and the voltage is not stabilized, the circuit in the camera will work unstable, so that the camera will not work stably, and the required performance will not meet the requirements;
It is better to choose a small power supply that is more than twice the current of the camera. If the current of the camera is 200mA or 250mA, generally 500mA is sufficient. If it is too large, such as 1A for 1 camera, the volume will be too large and the price will be too expensive; if it is too small, such as equal to the current of the camera, it may generate heat (due to long continuous working time) and affect reliability and working life.

Third, the choice of lens, etc.

The camera lens is the key equipment of the infrared camera. Its quality (indicator) directly affects the imaging effect of the system. Therefore, the selection of the lens is not only related to the quality of the system, but also related to the project cost. Therefore, pay attention to the following points when choosing a lens:

It is best to choose an infrared lens

Because of the ordinary optical lens, the infrared light reflected by the object back to the lens cannot be effectively focused on the CCD target surface. At this time, the infrared night vision effect will be greatly reduced, so it is best to use an infrared lens. Especially for color-to-black cameras, if the infrared lens is not used, the focal plane of the day and night monitoring cannot be consistent, so that the day and night images cannot be kept clear.

The imaging size of the selected lens should preferably be consistent with the size of the image sensor in the camera

The imaging size of the selected lens should be consistent with the size of the image sensor in the camera. If the size of the image sensor is 1/2″, the imaging size of the lens must be 1/2″.

When the imaging size of the lens is larger than the size of the photosensitive surface of the camera, the imaging will not be affected, but the actual imaging field of view is smaller than the nominal field of view of the lens, and when the imaging size of the lens is larger than the photosensitive surface of the camera If the size is small, it will affect the imaging, and it will appear that the imaging picture is blocked by the lens barrel, and black corners will appear on the four corners of the picture.

It can be seen that for 1/3″ cameras, 1/3″, 1/2″ and 2/3″ lenses can be used; for 1/2″ cameras, 1/2″, 2/3″ lenses can be used 1/3 of the lens can not be used. Because the CCD is like the human eye, and the lens is like the glasses that people use. If the glasses are too small, the eyes will not be able to see the surrounding things clearly.

It is best to choose the same installation method as the interface of the lens and the camera

There are two installation methods for the interface between the lens and the camera: C-type installation and CS-type installation, and the two should be the same. If you choose a C-type lens, you need to add a 5mm thick adapter ring. If it is directly connected to the CS interface camera without an adapter ring, the rear mirror of the lens may touch the protective glass of the sensitive surface of the CCD, resulting in damage to the CCD camera, which needs special attention in practice.

It is best to choose an automatic aperture lens to adapt to the large changes in day and night illumination

Due to the day and night monitoring, the illuminance changes in a large range, so it is best to choose an automatic aperture lens that can automatically change according to the illuminance to keep the image clear.

The resolution and light transmittance of the lens must meet the requirements

The resolution of the imaging lens used must be greater than that of the camera, otherwise the required clear effect cannot be achieved. And the light transmittance of the lens in the lens should be good, that is, the attenuation of light should be very small.

The monitoring distance is more than 1 km, and the laser beam expander collimation lens is also required

According to the size and distance of the scene to be observed, choose the appropriate laser beam expander collimation lens, so that the laser beam can illuminate the scene to be monitored, so that the reflected light of the monitored scene can be received by the camera.

Pay attention to choose a protective cover with good performance window glass

In addition to selecting infrared lamps, cameras, and lenses, we must also pay attention to the comprehensive consideration of protective covers, power supplies, etc. Because the protective cover has an impact on the effect of the infrared lamp, if the infrared light passes through different media, the transmittance and reflectance are different. For example, different window glasses, especially self-defrosting coated glass, have different attenuation of infrared light, so pay attention to choose a protective cover with good performance window glass.

Four. Conclusion

It can be seen from the above that the three infrared light sources have their own advantages and disadvantages, but thermal infrared light sources are basically eliminated by infrared LED and LED-Array light sources. Because the LED-Array can also be irradiated to a distance of several hundred meters to monitor the scene. As for the ultra-long-distance monitoring scene of more than 1km, it is better to choose infrared LED light source. Because of its high brightness, one LED is equivalent to many LEDs, so the infrared LED light source is small in size and light in weight, and is the best choice for ultra-long distance.

The most important issue in the selection of infrared cameras is completeness. In addition to selecting a good infrared light source, comprehensive consideration should be given to the matching of cameras, lenses, protective covers, power supplies, etc. Only by comprehensively considering the selection points mentioned in the article can we get twice the result with half the effort.

LED application PCBA

queendomlamp — Sun, 25 Dec 2022 10:06:16 +0000

pcba led assembly

LED application PCBA control board electrical digital application technology Queendom SMD LED, in-line LED is also widely used in the household appliance industry, SMD LED, through-hole LED is also widely used in the household appliance industry, Queendom’s LED diode is durable, High temperature resistance, anti-vibration, low light attenuation, high brightness and other advantages are very popular among users. All products are strictly inspected in accordance with the national system safety certification, from chips, brackets, gold wires, etc. are all high-quality materials.

SMD LEDs are applied to refrigerators. For example, the temperature data of the refrigerator displayed in the visualization area on the refrigerator is the application of SMD LED lights, as well as the internal lights of the refrigerator that turn on and off when the refrigerator door is opened. It provides a good lighting effect with high brightness.

The SMD LED is applied to the purifier, and the light display block on the purifier is the application of the SMD LED light, which well shows the data and numbers adjusted by the purifier. And the light color of different transformations can be changed accordingly.

SMD LEDs and direct-plug LEDs in the air-conditioning home appliance Queendom are well applied, the temperature display in the center of the air conditioner, and the LED indicator light in the air conditioner.

Optoelectronics’ LEDs are popular among users for their advantages of toughness, high temperature resistance, shock resistance, low light decay, and high brightness. All products are strictly inspected in accordance with the national system safety certification, from chips, brackets, gold wires, etc. are all high-quality materials.

SMD LED lamp beads are used in refrigerators. For example, the temperature data of the refrigerator displayed in the visualization area on the refrigerator is the application of SMD LED lights, as well as the internal lights of the refrigerator that turn on and off when the refrigerator door is opened. It provides a good lighting effect with high brightness.

SMD LED lamp beads are applied to the purifier, and the light display block on the purifier is applied with SMD LED lights, which well shows the data and numbers adjusted by the purifier. And the light color of different transformations can be changed accordingly.

Queendom focuses on R&D and production of high-end LED light-emitting diodes, including visible light in-line LEDs, visible light patch LEDs, infrared emitting tubes, infrared receiving heads and other optoelectronic products. Combined with the actual application needs of customers, we can provide effective application solutions, and provide a variety of research and development design suggestions, as well as various customized products, to fully meet the different needs of customers. Products are widely used in traffic instructions, beauty care products, home appliances, electronic digital products, smart products, computer peripheral products, automotive electronics, toys and gifts, security products, mobile communications and many other production fields.

led application in medical industry

queendomlamp — Thu, 22 Dec 2022 15:38:06 +0000

This article summarizes the research and application of light-emitting diodes (LED) in animal models and clinical medicine in recent years, including the research of LED application in animal cells and human tissue cells, the research of LED application in animal models, and the experiment of LED in clinical treatment Research. Look forward to the prospect of LED application in clinical treatment. LED Phototherapy Cell Animal Clinical Light Emitting Diode (1ight emitting diode, LED) drive circuit is easy to control, has a long service life and is low in price. With the continuous development of semiconductor technology, LED has greatly improved the performance of parameters such as luminous intensity, peak wavelength, and half-wave bandwidth. At present, the light effect of a single LED has exceeded 1001mW; the peak wavelength is becoming more and more stable, the half-wave bandwidth is narrower, and the monochromatic performance is good; the directionality is good; the covering wavelength is from ultraviolet to infrared, and monochromatic LEDs of almost any wavelength can be found. These characteristics provide a technical basis for LEDs to be used in the medical field. This paper summarizes the work that LED has done in the medical field, and looks forward to the application prospect of LED in the biomedical field.

Medical Bio-LED

1 Research on the effect of LED on animal tissue cells Whelan et al. used LEDs of different wavelengths and irradiation doses to irradiate cells cultured in vitro. Cell proliferation increased by 55% to 71% compared with the control group. Whelan fibroblasts extracted from Sprague Dawley mouse skin were irradiated with 670nm LED at a dose of 4J/cm2, and osteoblasts (MC3T3-E1) were extracted from mouse bone with 670nm, 728nm and 880nm LEDs, respectively With a dose of 4J/cm2

On the second day after irradiation, the percentages of DNA synthesis in fibroblasts and osteoblasts were measured compared with those in the control group. It was found that the percentage of DNA synthesis in cells after LED irradiation was significantly increased, and at the second day The percentage of days is increased.

Liu Jiang et al. used different concentrations of simvastatin to culture mouse skeletal muscle C2C12 cells, and then irradiated them with red LEDs [wavelength (640±15) nm] of varying intensities for 2 days, 15 min/d. Cell proliferation was assessed by the methylthiazolyl tetrazolium colorimetric assay. It was found that the proliferation of C2C12 cells in the experimental group with a concentration of simvastatin of 2.0×10-5mol/L was inhibited, and this inhibitory effect could be antagonized by the photobiomodulation effect of red LED[1]. It is further confirmed that photobiomodulation only regulates dysfunctional cells or tissues, and has no effect on normal functioning tissues or cells.

For canine neuroma cells (2A9) and human glioblastoma cells (U373) cultured in vitro, use Lutetium Texaphyrin (Lutex, absorption peak 740nm ) and Benzoporphyrin Derivative (BPD, absorption peak 690nm ) as photosensitizers, using PDT method In the experiment of killing tumor cells, when LEDs with emission peaks at 728nm and 680nm were used as light sources, 50% to 86% of cancer cells in the two cell lines were killed.

2 Study on LED therapy in animals Whelan conducted a study on gene expression changes in traumatic hyperglycemic mice undergoing LED rehabilitation phototherapy. The drug was implanted subcutaneously in the back of the mouse, and LED phototherapy was performed every day. Finally, the skin was cut to remove the drug sponge to extract RNA, which was then analyzed using eDNA array. The results showed that compared with samples without phototherapy, gene regeneration was obvious in the samples after phototherapy. LED light therapy can accelerate the natural wound healing process, allowing patients to return to pre-illness levels of activity more quickly. In the experiment, Li Fengmin et al. used blue-violet light with a wavelength of 380-460nm, a peak value of 410nm, and an output power of 40mW to irradiate burn and trauma rat models. The irradiation distance was 8cm, and the spot diameter was 65mm.

3 Each irradiation dose was 0.72 J/cm2, 10 min, starting on the first day after operation, once a day, for 12 d continuously. Experiments have shown that blue-violet light in this wavelength range can significantly increase the content of hydroxyproline in rat burn wound skin tissue, thereby promoting the growth of granulation tissue and wound healing, and improving the tensile strength of the healing wound. Blue-violet light irradiation can increase the phagocytic rate and phagocytic index of peritoneal phagocytes in burnt rats, that is, improve the phagocytic ability of rat peritoneal phagocytes to improve the body’s immunity, thereby promoting wound healing [2].

3 LED research in clinical medical experiments

3.1 Treatment of acne Acne is a common sebaceous gland disease, with an incidence rate as high as 80% among adolescents. Excessive sebum secretion and proliferation of Propionibacterium acnes are the main causes of the disease. At present, local and systemic treatments are mainly based on antibiotics and isotretinoin drugs, but the use of antibiotics will lead to drug resistance of Propionibacterium acnes, and isotretinoin drugs will produce obvious side effects, resulting in limited clinical application. Propionibacterium acnes is irradiated with LED blue light with a wavelength of about 415 nm, which can cause the endogenous porphyrins (mainly protoporphyrin IV and coproporphyrin III) of anaerobic P. acnes to undergo a photochemical reaction to generate singlet oxygen. Thereby killing bacteria and achieving the effect of treating acne. LED blue light therapy is safe and effective without the drug resistance and side effects of traditional treatments.

3.2 Treatment of neonatal jaundice

The typical application of LED blue light phototherapy is the treatment of neonatal jaundice. The light that can be absorbed by bilirubin has the best wavelength of 450-460nm, while the main wavelength peak of LED blue light is between 425-475nm , so far it is still the best light source for phototherapy. In the experiment, Zhao Xinchun et al. randomly divided 120 neonates with clinical diagnosis of hyperbilirubinemia into

The experimental observation results of the LED phototherapy group and the luminal group: the clinical effective rate of the LED blue light phototherapy group was 83.3%, and that of the luminal group was 33.3%. Obviously, LED blue light irradiation is safer and more effective in treating neonatal jaundice.

3.3 Treatment of wound healing According to the research results of low-energy laser on wound healing, many companies have launched products that use LEDs to promote wound healing and tissue healing, and have done a lot of clinical research and obtained satisfactory results. Whelan and other studies on animal bodies and cells believe that LED irradiation can make human muscle and skin cells grow at 5 times the normal speed. The study was conducted by the Midwestern Athletes Against Childhood Cancer (MACC) Foundation Research Center at the Wisconsin-Madison School of Medicine. The FDA has approved the team led by WHELAN to conduct clinical trials on the experimental therapy of LED, and the results are satisfactory for wound recovery. At the same time, Whelan’s research is also used in tissue healing in a gravity-free environment, applying this technology to long-distance and long-duration space travel to treat astronaut injuries. In addition, the technology was used on a US submarine with an array of LEDs to heal potential training injuries. 3.4 Increasing the body’s endurance and anti-fatigue ability Jia Danbing et al. used LED red light with a wavelength of 600nm-1200nm to detect the content of myocardial enzymes, blood coagulation series and blood routine related molecules, and studied the effect of red light irradiation on human body’s anti-fatigue ability and Endurance effects. Results Compared with the control group, the contents of HB, IBC and Ca in the experimental group were significantly increased after red light irradiation, while other indicators did not change significantly, and HB and Rt3C played an important role in tissue oxygen supply. During the body’s exercise, by improving the tissue’s ability to withstand hypoxia, reducing the anaerobic metabolism of the tissue and reducing the generation of lactic acid during exercise, the body’s soreness and fatigue can be significantly reduced under the same intensity of exercise, and the body’s endurance and resistance can be improved. Fatigue ability. The experiment showed that the content of HB and 5 after red light irradiation increased significantly compared with that before irradiation through self-control and inter-group control research. After light irradiation, the oxygen-carrying capacity of the blood is significantly increased, and the body’s endurance and fatigue resistance are increased.

3.5 Oral Ulcer Inflammation Treatment

Some pediatric patients with leukemia receive maximal doses of chemoradiotherapy to kill the neoplastic bone marrow before implanting bone marrow that matches their cellular antigens, as chemotherapy drugs and radiation therapy would not Differentially kills rapidly dividing cells, such as oral mucosal cells and gastrointestinal cell lines. These chemotherapy patients often cause acute oral ulcers, resulting in difficulty in swallowing and swallowing, and severe gastrointestinal reactions. Using LEDs with a wavelength of 688nm , after the last chemotherapy, they received a LED irradiation dose of 4J/cm2. Among the 30 patients treated with LEDs, 47% of the oral pain was relieved, and the degree of healing of their oral ulcers was better than expected better.

3.6 Treatment of seasonal depression

One of the best ways to beat the seasonal blues is to use light. Light can stimulate the retina, and the retina transmits this stimulus information to the nervous system, and then to the light-sensitive melatonin in the brain. Melatonin plays an extremely important role in adjusting the body’s circadian rhythm. Patients with seasonal depression have elevated levels of melatonin. Because full-spectrum light reduces melatonin secretion, it is very effective in treating SAD patients with light. Green light (wavelength 540nm) is the most obvious spectrum to inhibit melatonin secretion. In 1991, IBERMAN mentioned that LEWY believed that irradiating with white light with an intensity of 10mW for 30 minutes after getting up every day can inhibit the secretion of melatonin and relieve seasonal depression. This observation is important not only for understanding the physiological consequences of melatonin, but also for regulating secretion rhythms.

6 SAD and other health problems. At present, relevant patents on the application of LEDs have been applied for, and the content is light therapy for various physiological and mental disorders, such as light therapy for SAD.

【References】Photobiomodulation of C2C12 Cell Proliferation by Red Light Emitting Diode Irradiation[J]. Chinese Clinical Rehabilitation, 2006, l0(13): 107-109

Effects of blue-violet light on skin wound and burn healing in rats. Chinese Journal of Physiotherapy [J]. 2001, 24 (5): 294-295.