As the name implies, the infrared camera is at night, the camera emits infrared light that is invisible to the naked eye to illuminate the object being photographed, and then receives the reflected infrared light to form an image. Turn off the IR filter when you use it at night so that it no longer blocks infrared rays from entering the CCD. At this time, what we see is an image formed by infrared reflection, rather than an image formed by visible light reflection. At this time, an image that cannot be seen by the naked eye in a dark environment can be captured. Video surveillance is developing outdoors, outdoor monitoring is developing toward night vision, and the development direction of night vision is currently based on infrared light. This trend has become the opinion of most camera industry personnel.
Because the infrared camera can obtain a clear picture in the zero illumination environment at night, and has greater concealment, it has been widely recognized in the market, and its market share is gradually expanding. According to the survey, the domestic infrared camera market has a large demand, and the market share of infrared camera products is increasing year by year, reaching 30% in 2010. From the perspective of the global security market, infrared cameras are very "Chinese characteristics". Even Sony and other foreign brands such as Samsung, which have just entered the Chinese market, have begun to develop infrared cameras to adapt to localization in China. Infrared cameras are currently developing hot in the domestic market, but at the same time, the shortcomings exposed by infrared cameras in applications are becoming more and more obvious.
Development of infrared cameras
In order to meet the needs of all-weather monitoring, as early as 2001~2003, China's monitoring manufacturers began to explore infrared camera technology. From the early camera plus infrared panel module to the integrated design of the camera and infrared light, from the LED infrared light manual mode to the automatic control of the photoresistor, to the introduction of the camera dual filter; from the most basic video Infrared cameras that require a variety of functional requirements, such as waterproof and riot, strong light suppression, face recognition, privacy masking, etc., all witness the rapid development of China's infrared camera technology and market. After 2006, as more and more manufacturers flooded into the field, the infrared camera market gradually formed a situation of oversupply, and competition among manufacturers became more and more intense. In the era of security industry competition, infrared camera products, like other security products, have the same era imprint. Objectively speaking, the flood of hand workshops and the lack of industry standards have restricted the development of the infrared camera market to some extent.
After infrared technology was discovered by British astronomer Herschel in 1800, more and more scientists are studying how to apply it in various occasions. The application of active infrared camera technology in security monitoring has been fast for nearly two decades. The development technology is relatively mature. 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 infrared 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.
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