Infrared cameras have outstanding advantages such as long-range night vision, strong concealment, and stable performance in surveillance cameras, thus occupying most of the market in CCTV night vision surveillance.
Infrared camera technology classification
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 large size, 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 Diode A PN junction is made of a material with high infrared radiation efficiency (common GaAs GaAs). A forward bias voltage is applied to the PN junction to inject infrared light. The spectral power distribution is center wavelength of 830 to 950 nm, and the half-peak bandwidth About 40nm or so, it is a narrowband distribution, which is a range that can be sensed by a CCD camera. LED infrared cameras are generally suitable for medium and short 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 corridors, halls, warehouses and other interior and exterior buildings, community perimeters, roads, etc. monitor.
Third, the LED array infrared camera: The core of the array infrared lamp is an LED array. Compared with the traditional LED, the LED array has the following advantages: 1. The brightness is high, the output of a single LEDArray is about 1W-30W, and the brightness is about It is tens of times of the output of conventional single LED 5~15mW, so the range is far away; 2. The efficiency of electro-optical conversion is high, the electro-optic conversion efficiency of ordinary infrared LED is only about 10%, while the efficiency of electro-optical conversion of LEDArray is improved to 25%. Left and right; 3, small size, LEDArray technology will be highly integrated lighting unit, under the same brightness indicators than ordinary LED infrared light product volume is much smaller; 4, long life, LEDArray's life is 50,000h, much higher than the average LED life . 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 is more suitable for short-distance monitoring applications such as indoor and building exteriors, community perimeters, and roads in halls and warehouses.
Fourth, dot matrix infrared cameras use dot matrix infrared light sources. The third-generation infrared light-emitting components used in dot-matrix infrared lamps are based on the second-generation product array-based infrared arrays (LED arrays), and are also called second-generation LED-Arrays. Compared with the first generation, the second-generation LED-Array has the 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, the laser infrared camera: laser infrared camera irradiation distance is generally up to 300 ~ 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.
Infrared camera technology classification
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 large size, 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 Diode A PN junction is made of a material with high infrared radiation efficiency (common GaAs GaAs). A forward bias voltage is applied to the PN junction to inject infrared light. The spectral power distribution is center wavelength of 830 to 950 nm, and the half-peak bandwidth About 40nm or so, it is a narrowband distribution, which is a range that can be sensed by a CCD camera. LED infrared cameras are generally suitable for medium and short 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 corridors, halls, warehouses and other interior and exterior buildings, community perimeters, roads, etc. monitor.
Third, the LED array infrared camera: The core of the array infrared lamp is an LED array. Compared with the traditional LED, the LED array has the following advantages: 1. The brightness is high, the output of a single LEDArray is about 1W-30W, and the brightness is about It is tens of times of the output of conventional single LED 5~15mW, so the range is far away; 2. The efficiency of electro-optical conversion is high, the electro-optic conversion efficiency of ordinary infrared LED is only about 10%, while the efficiency of electro-optical conversion of LEDArray is improved to 25%. Left and right; 3, small size, LEDArray technology will be highly integrated lighting unit, under the same brightness indicators than ordinary LED infrared light product volume is much smaller; 4, long life, LEDArray's life is 50,000h, much higher than the average LED life . 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 is more suitable for short-distance monitoring applications such as indoor and building exteriors, community perimeters, and roads in halls and warehouses.
Fourth, dot matrix infrared cameras use dot matrix infrared light sources. The third-generation infrared light-emitting components used in dot-matrix infrared lamps are based on the second-generation product array-based infrared arrays (LED arrays), and are also called second-generation LED-Arrays. Compared with the first generation, the second-generation LED-Array has the 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, the laser infrared camera: laser infrared camera irradiation distance is generally up to 300 ~ 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.
Guangzhou Jointair Co., Ltd. , https://www.jointair.cn