Five types of infrared surveillance cameras

After infrared technology was discovered by British astronomer Herschel in 1800, more and more scientists were studying how to apply it in various occasions. The application of active infrared camera technology in security monitoring has been rapid for more than 20 years. The development of technology is more mature. Infrared cameras are developing and growing at lightning speed, and the types of products are constantly diversifying, and the application fields are being further expanded. To sum up, there are the following types:

First, the halogen camera infrared camera that has been eliminated: The halogen lamp has very strong luminous power. Of course, the power consumption and heat generation will be relatively large, and the cost is relatively high. Its fatal disadvantage is its bulkiness, insufficient heat dissipation, and very short life span. Generally within a thousand hours, and the red storm phenomenon is particularly serious, it is not suitable for civilian night vision surveillance. Halogen Infrared Cameras have large power and have optical and thermal conversion of filters. Therefore, the problem of heat generation is particularly serious. The maintenance cost is high and the service life is short.

Second, led infrared camera: led infrared light is composed of a certain number of infrared light emitting diodes. Infrared emitting diodes are made of pn junctions with high infrared radiation efficiency (commonly used gallium arsenide), plus a forward bias voltage to inject infrared current into the pn junction to excite infrared light. The spectral power distribution is center wavelength of 830~950nm, half-peak bandwidth. About 40nm or so, it is a narrowband distribution, which is the range that the CCD camera can sense. Led infrared cameras are generally suitable for short-to-medium distances of 10 to 100 meters and have the highest market share. However, there is a problem of non-uniform illumination. They are mainly suitable for use in corridors, halls, warehouses and other interior and exterior buildings, community perimeters, roads, etc. monitor.

Third, led array infrared camera: The core of the array infrared lamp is a light-emitting diode array (LED array), which has the following advantages compared with the traditional LED: 1. The brightness is high, the output of a single LED array is about 1W-30W, and the brightness is about Is a conventional single led output of 5 ~ 15mw dozens of times, so far range; 2, electrical - optical conversion efficiency is high, ordinary infrared led electro-optical conversion efficiency is only about 10%, and ledarray electro-optical conversion efficiency is improved to 25% Left and right; 3, small size, ledarray technology will be highly integrated light unit, under the same brightness indicators than the average led infrared light product size is much smaller; 4, long life, ledarray life of 50,000h, much higher than the average life of led . Array infrared lamp products have a clear deficiency, namely "eccentricity." Since the light emitting angle can reach 120-180 degrees, it is necessary to reduce the light transmission angle through the lens to match the camera lens. This inevitably causes a lot of light to deviate from the center of the lens, resulting in poor light transmission efficiency. The application scope of the led array infrared camera is basically the same as that of the led infrared camera, and it is more suitable for short-distance monitoring applications in the interior and exterior of buildings such as halls and warehouses, the perimeter of the community, and roads.

Fourth, dot matrix infrared cameras use dot matrix infrared light sources. The third-generation infrared light-emitting devices used in dot-matrix infrared lamps are based on the second-generation product, led-array, and are also called second-generation led-arrays. Compared with the first generation, the second generation led-array has the biggest advantages of small size, good heat dissipation, low attenuation, long life, and a rated life of 50,000 hours. The dot matrix infrared lamp is also called high-power array infrared. The biggest difference from the low-power array infrared is higher brightness and lower cost, and through the independent lens, the light distribution angle can be arbitrarily adjusted according to the use demand, so that it can be solved simultaneously. The first generation of "flashlight effects" and the second generation of "eccentricity."

Fifth, laser infrared camera: laser infrared camera irradiation distance is generally up to 300 to 5000 meters, due to energy concentration, the angle is not close to the short distance, the current cost is still high. It is more suitable for the monitoring of forest fire prevention, oil fields, railways, water conservancy, scenic spots, military, aquaculture, ports, and security markets. With the further reduction of costs, it has been applied to many areas that require night vision surveillance including the community. . Therefore, infrared cameras need to determine the type of camera according to the specific use environment, especially the night environment.

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