Because of its particularity, infrared cameras are quite strict in the installation and selection process. If the operation is improper, in addition to the usual whitening and glare, there are also a lot of snowflakes. The editor summarizes the situation and the reasons for the occurrence of snowflakes are as follows:
First, the lack of current of the infrared camera leads to the formation of snowflakes. It is convenient for some outdoor short-distances to use 12V centralized power supply, but if it is long-distance, it is not suitable to use switching power to provide centralized 12V power supply; because first, long-distance infrared lamps generate large heat, and the unstable 12V power supply may cause insufficient power; and all Without a built-in heat sink, it is easy to burn out when the current is unstable; second, the current decays quickly, which may cause the infrared lamp to fail to work normally, and the CCD illuminance is relatively high and the infrared lamp auxiliary light cannot be obtained, so the snow drifts With the wind.
Second, the quality of the infrared light of the infrared camera is poor, and the angle and infrared distance of the infrared light do not match the lens, causing snow drift. In order to facilitate their own purchase and installation, many companies use lights with different angles to mix and use. The advantage of this use is that they can barely use different millimeter-sized lenses for the same lamp. The disadvantage is that it always makes people feel the light. The angle and distance are not suitable for the lens. When the angle is not suitable, flashlight phenomenon or narrow electric phenomenon is easy to appear; when the distance does not match, for example, if you use a 12MM lens but use a lamp of ten to twenty meters, then you There will be a grayish phenomenon; a blur in the distance and snow fluttering in the vicinity; and, in addition to decoration, the more the lights, the more problems, the more concentrated the lights, the more heat, and the easier it is Burn out.
Third, the handicraft issue. When many people work by hand, the infrared light is not concentrated and astigmatized; the scattered light causes light everywhere, but it is gray and hazy; the cotton at the front of the infrared light is not tightly blocked, and the concentrated infrared red scattered light is therefore a vague phenomenon.
Fourth, the built-in is a low-quality infrared camera with extremely high illuminance. In order to obtain brighter images under the same infrared lamp auxiliary light, many factories artificially increase the sensitivity of CCD; because many manufacturers use very Inferior cameras are built-in. When the infrared light is insufficient, this kind of camera artificially increases the gain sensitivity of the CCD to make it brighter, just like we increase the brightness on the hard disk video recorder, it is very prone to snowflakes. of.
Fifth, the circuit design is unreasonable; when we produce infrared cameras, we not only install the infrared light directly into the camera and then do it, but also redesign and age the camera circuit before installing it. Many small processing factories on the market use cheap electronic components, buy cheap infrared lamps, and solder them directly with an electric soldering iron. There is no redesign or aging treatment for the circuit. Other factories that make low-end products save money. The control board of the control circuit board is removed or integrated with the light board, which can easily lead to the infrared light receiving unstable current and heating, making the inherently inferior infrared light unable to work normally.
Sixth, another possibility is that when there is a lot of dust outdoors, especially in the wild, it is possible that the infrared light in the camera has captured the small particles that are invisible to the naked eye. This is not the case in the daytime. When it is turned on, the inner eyes and the camera do not feel obvious; this is the environment.
In summary, there are more reasons for producing more snowflakes, but there are more solutions than difficulties. As long as the real reason is discovered, the solution is much simpler. As long as you are willing to spend the cost and time, I will give you Suggest:
First, use a highly stable transformer to solve the problem of insufficient current; use a multimeter to test the voltage and current to ensure that the infrared lamp works normally.
Second, use high-quality infrared lamps; this is also important. If an infrared lamp is not good, no matter how good the current is, it is useless.
Third, replace the inferior camera inside. Maybe the camera's illuminance is extremely high, and when the outdoor brightness is not high, snowflakes are easy to appear; use a black and white camera or use a color to black and white color camera.
Fourth, adopt double filter or double glass structure to improve the intake of infrared light at night and effectively enter the water mist to affect the lens.
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