What is the reason for the snowflakes on the camera screen at night?

Users may have encountered such a situation: the camera is white, dazzling, snowflakes drifting, and the snow is generally like at night. In response to this situation, the Hong Kong Zhiteng Technology Department has conducted many experiments (changing infrared lamps and circuit boards, changing CCDs, changing places, and changing brands), and conducted internal and external investigations to summarize the reasons for the situation:

The quality of the infrared lamp is poor, and the angle and infrared distance do not match the lens

In order to facilitate their own purchase and installation, many companies use a variety of lamps with different angles to mix together. The advantage of this is that the same lamp can barely use lenses of different sizes. The disadvantage is that people always feel the angle and distance of the lamp 2. The lens is not suitable. When the angle is not suitable, the flashlight phenomenon or narrow electric phenomenon is easy to occur. When the distance does not match, for example, you use a 12MM lens, but use a lamp of ten to twenty meters, then there will be a gray phenomenon, a blur in the distance, and snow fluttering in the vicinity. In addition, inferior infrared lamps, in addition to decoration, the more lamps, the more problems; the more concentrated the lamp, the greater the calorific value, the easier it is to burn out.

Insufficient current causes snowflake spots

It is convenient to use centralized power supply 12V for short distance outdoor, but if it is long distance, it is not suitable to use switching power supply for centralized 12V power supply. Because the long-distance infrared lamp has a large amount of heat, the unstable 12V power supply will cause insufficient power, and it is easy to burn out without a built-in heat dissipation device when the current is unstable; in addition, the current decay rate is fast, causing the infrared lamp to not work properly. The illuminance on the upper CCD is relatively high and the auxiliary light of the infrared lamp is not available, so "snow drifting" appears.

In a dusty environment

Especially in the wild, the infrared light in the camera shoots out small particles that are invisible to the naked eye. This is not obvious to the naked eye and the camera when the infrared light is not turned on during the day, and snowflakes appear at night. This phenomenon is caused by the environment.

In addition, handicraft problems, built-in inferior cameras, unreasonable circuit design and other reasons can also lead to "snowflake".

The above is the experimental experience shared with you. Here, we sincerely remind the majority of engineering customers that using brand-guaranteed and better-quality products is the best solution to prevent problems.