Infrared camera development trend analysis
As a monitoring front-end device, the development of infrared cameras cannot circumvent the eternal theme of security monitoring: network, high-definition, and intelligent.
At the same time, there will be development trends in the following areas:
1. Video surveillance develops outdoors, outdoor surveillance develops toward night vision, and the development direction of night vision is based on infrared. This trend has become the development trend of the camera industry.
2. With the development of optoelectronics, microelectronics, microcomputers and digital video technology, the security industry has moved from traditional simple simulation to highly integrated miniaturization, digitization, networking and intelligence.
3, laser night vision technology is one of the ways to achieve long-distance night vision monitoring, because the laser has high brightness, good coherence, good monochromaticity, good directionality, long life and CCD is more sensitive to its wavelength than LED The characteristics determine that the laser can illuminate farther distances, and the light intensity is much stronger than conventional light sources.
Infrared camera five types of dissection
While the infrared camera has grown stronger and faster, the product types are constantly diversifying and the application fields are further expanding. There are several types that can be summarized:
First, the halogen camera that has been eliminated: The halogen lamp has a very strong luminous power. Of course, the power consumption and heat generation are relatively large, and the cost is relatively high. Its fatal disadvantage is that it is bulky, has insufficient heat dissipation, and has a very short life. It is generally within a thousand hours, and the red storm phenomenon is particularly serious, so it is not suitable for civil night vision monitoring. Due to the high power and the light-to-heat conversion of the filter, the halogen infrared camera has a particularly hot heating problem, high maintenance cost and short life.
Second, LED infrared camera: LED infrared light is composed of a certain number of infrared light-emitting diodes. The infrared emitting diode is made of a material with high infrared radiation efficiency (commonly used GaAs GaAs), and a forward bias voltage is applied to the PN junction to inject infrared light. The spectral power distribution is center wavelength 830~950nm, half-peak bandwidth. About 40nm, it is a narrow band distribution that is sensible for CCD cameras. LED infrared camera is generally suitable for short distances of 10~100 meters, and has the highest market share, but there are problems of uneven illumination. It is mainly suitable for short distances such as corridors, halls, warehouses, etc., indoor and building peripherals, community perimeters, roads, etc. monitor.
Third, the LED array infrared camera: the core of the array type infrared lamp is an LED array, which has the following advantages compared with the conventional LED: 1. The brightness is high, the output of the single LED array is about 1W~30W, and the brightness is about It is the output of conventional single LED 5~15mW, so the range is far; 2, the electro-optical conversion efficiency is high, the electro-optical conversion efficiency of ordinary infrared LED is only about 10%, and the LEDArray electro-optical conversion efficiency is improved to 25%. 3, small size, LEDArray technology will be highly integrated in the lighting unit, much smaller than the ordinary LED infrared lamp product under the same brightness index; 4, long life, LEDArray life is 50,000h, much higher than ordinary LED life .
The array type infrared lamp product has an obvious deficiency, that is, "eccentricity phenomenon". Since the illumination angle can reach 120-180 degrees, it is necessary to reduce the light supply angle through the lens to match the camera lens, so that inevitably a lot of light deviates from the center of the lens, resulting in poor light transmission efficiency. The LED array infrared camera is basically the same as the LED infrared camera. It is more suitable for medium and short-distance monitoring applications such as halls, warehouses, etc., indoor and building peripherals, community perimeters, and roads.
Fourth, the dot matrix infrared camera uses a dot matrix infrared light source. The third-generation infrared illuminating components used in dot-matrix infrared lamps were developed on the basis of the second-generation LED array (LEDArray), so it is also called the second-generation LED-Array. Compared with the first generation, the second-generation LED-Array has the advantages of small size, good heat dissipation, slow decay, long life and a rated life of 50,000 hours. Dot matrix infrared lamps are also called high-power array infrared. The biggest difference from low-power array infrared is higher brightness and lower cost. Through independent lenses, the angle of light distribution can be adjusted according to the needs of use. The first generation of "flashlight effect" problem and the second generation of "eccentricity phenomenon".
Fifth, laser infrared camera: laser infrared camera illumination distance is generally up to 300~5000 meters. Due to energy concentration, the angle is small and close, and the cost is still high. It is more suitable for monitoring in forest fire prevention, oil field, railway, water conservancy, scenic area, military, aquaculture, port and Ping An market. With the further reduction of cost, it has been applied to many areas requiring night vision monitoring including community. . Therefore, the infrared camera needs to determine the camera type according to the specific use environment, especially the night environment.
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