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The use of infrared lamps requires special attention in their structural installation and circuit design. Because the hot gas is rising, if the infrared lamp is installed lower, it will cause the increase of heat to affect the camera work, so the LED lamp should be installed more on the upper; In addition, the infrared lamp is used in the circuit design, use the infrared lamp to open and the day and night of the camera. Conversion function linkage control method, when the camera is converted to night mode infrared light automatically turns on, compensates the camera's image brightness in the night mode, improve the clarity of the image, which is also a very important test for the manufacturer's circuit design.
Separating the infrared light from the CCD is also a practice of some manufacturers. Zhang Yukun, an authorized design engineer of Guangzhou Meidian Bell Electrical Technology Co., Ltd., said that his company uses two glass plates to isolate the CCD, the lens, and the infrared lamp from each other. The iron ring is used in the middle and the iron ring is protruded. This can dissipate part of the heat. , can reduce the ambient temperature of the camera work.
In addition, manufacturers also add heat sinks or fans to infrared cameras. Such as Jia Xinjie's Wang Qiang introduced, you can install a layer of aluminum substrate under the infrared light board, use the thermal conductivity of the aluminum substrate to fully guide the heat to the shell. In response, Huang Yizhe, manager of R&D Department of Shanghai Kentong Electronics Co., Ltd. explained that the former infrared lamp board was made of glass fiber board and had a low thermal conductivity, but now the used aluminum board has better thermal conductivity, and due to the infrared lamp installation On the aluminum substrate, heat can be transferred to the aluminum substrate through the infrared lamp bracket feet for heat dissipation. Infrared cameras use the Sony CCD. The maximum temperature of the CCD is 65°C. If the infrared lamp emits no more than 65°C, it will not damage the camera. Therefore, the use of high-quality infrared lamps is the fundamental solution to the problem of heat dissipation.
Infrared cameras have a long-standing problem of heat dissipation, which is a problem that has caused headaches for many manufacturers. The infrared camera's biggest power consumption comes from the infrared light, many manufacturers seek the effect of night vision, deliberately increase the power of infrared light, in order to achieve a good video surveillance at night. According to industry insiders, the efficiency of converting LED lamps from electrical energy to light energy is only 25% at most, and simply increasing the operating current to illuminate more distant distances can only be counterproductive. The other 75% of electrical energy is converted into heat energy, resulting in its heat. If it rises, if the heat does not drain out for a long time, it will not only damage the infrared lamp itself, but also cause a certain impact on the life of the camera CCD. Therefore, the thermal problem of infrared cameras has not been completely solved yet, but many manufacturers have also made corresponding improvements to this problem.