In recent years, video surveillance technology has developed to some extent. However, there has always been a prominent problem in the field of video surveillance that has not been well solved, that is, video surveillance at night. Night surveillance is crucial, but surveillance cameras are like human eyes. When the light is too dark, you can't clearly see the target. You can only understand the outline and can't identify the face. It can't be used as a testimony. The basis for probative force.
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In order to solve this problem, various manufacturers in the security industry have explored many methods, such as active infrared LED infrared, laser infrared, passive infrared thermal imager, low light level night vision and other technologies. The most widely used active infrared night vision technology is to implement night vision monitoring by actively illuminating and using the infrared light of the target reflection infrared source to realize the nighttime monitoring requirements of the camera.
At present, more than 95% of the monitoring industry uses this technology to implement night vision monitoring. The LED infrared light tube emits the object to be monitored by actively emitting infrared wavelength light. Infrared light is not visible to the human eye and, therefore, is generally invisible. The brightness of the infrared light determines the clarity of the object being monitored.
Development of infrared technology
Active semiconductor infrared technology was first developed by Bell Labs in the early 1960s. The earliest infrared conversion efficiency was only 5%, and the efficiency was very low. It was mostly used in simple products such as infrared Remote Control. After repeated practice and development in night vision applications, by combining a single infrared LED package, it is fixed around the lens to actively fill the image of the surveillance camera. The effective efficiency of a single LED infrared diode is about 20%, but there are obvious defects, that is, the heat dissipation is limited by the heat dissipation treatment, so that the illumination distance is sharply reduced, and the nominal illumination distance is often not achieved; There is the volume of the product, which is limited by the number of LED tubes. In order to meet the lighting needs, it is necessary to assemble with multiple LED tubes, resulting in an increase in volume and inconvenience in application. In addition, because the heat of the LED can not be effectively dissipated, the overall temperature of the cavity increases, which seriously affects the performance of the camera CCD, which is why the life of the mainstream infrared camera on the market is relatively short. After a period of use, the effect is obviously worse. the reason.
Based on the urgent need of market practice, array infrared based on the original LED infrared technology, a revolutionary improvement, came into being. The array infrared night vision technology essentially implements the night vision effect by transmitting active infrared light waves through the camera, but adopts advanced packaging technology to package dozens of high-power, high-efficiency infrared crystal elements on one plane. As soon as this technology came out, it gained extraordinary rapid development.
The biggest advantage of the array infrared camera in the field of monitoring is that it solves the problem of heat dissipation of the LED light source. It has extremely high luminous efficiency and luminous intensity. The photoelectric conversion efficiency is about 25% higher than that of the ordinary infrared LED camera, and the efficiency can reach 45%. The energy consumption is greatly reduced, the illumination distance is increased, and the life of the camera is prolonged. The service life of the array infrared night vision camera is generally 9 times that of the ordinary infrared camera.
The main advantages of array infrared cameras
High Brightness
Obviously, the higher the brightness, the farther the illumination distance is. The output power of a single LED is generally 5~15mW. Although the current can be increased by increasing the current, the limitation of the material itself is the photoelectric conversion efficiency of the infrared. Not high, only 20% of the light, the remaining 80% is heat. Therefore, while increasing the brightness, more heat energy is generated, which is obviously not feasible for the key device CCD of the camera with strict operating temperature. In addition, multiple combinations of LEDs are based on the PCB board, and the heat dissipation performance is not good. The light source of the array infrared camera is configured with a good heat conduction device by encapsulating dozens of high-efficiency and high-power crystal cells on a flat surface through high-tech. At the same time increase its photoelectric conversion efficiency, the brightness is about 100 times that of a single LED.
small volume
As mentioned earlier, array infrared uses a highly integrated advanced packaging technology, an array of infrared chips packaged with dozens of wafers, only the size of the fingernail. Imagine what it would be like to combine dozens of individual LEDs together. The smallest size is most convenient for application. If you install dozens of individual LEDs combined with an infrared light source on a high-speed dome, the effect is conceivable. Known.
long life
The array infrared technology ensures the good working condition of the CCD, and its service life is 9 times that of the ordinary LED infrared camera. The ordinary LED infrared camera places the LED light-emitting tube and the camera in a cavity, and the heat of the LED tube cannot be effectively radiated through the PCB board, and the temperature problem seriously restricts the service life of the CCD. After 3 months of use, the ordinary LED infrared camera began to show signs of aging, such as blurry, whitish, lack of contrast, etc., directly affecting the use of the product, and even the entire camera was scrapped.
efficient
Determined by the characteristics of the semiconductor itself, its luminous efficiency and heat dissipation performance is a benign
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