With the increasing demand for night vision monitoring in security video surveillance system engineering, explosion-proof infrared cameras have entered the mainstream market of cameras and their sales are increasing. The problems with the application of infrared night vision technology are gradually being exposed, and the camera image is often unclear. Based on experience, there are six reasons why ordinary explosion-proof infrared cameras may not have clear images:

1. Snowflake point problem caused by insufficient current

Some outdoor short distance use of centralized 12V power supply is more convenient, but long-distance centralized 12V power supply should not use switch mode power supply. Because firstly, long-distance infrared lights generate a large amount of heat, and an unstable 12V power supply may lead to insufficient power. Without built-in heat dissipation devices, it is easy to burn out in unstable current conditions. The second reason is that the current decay rate is fast, which may cause the infrared light to malfunction. The illumination of charge coupled devices is high, making it impossible to obtain auxiliary light from infrared lamps, resulting in snow drifting.

2. Handicraft issues

Many times when manually installed, the infrared light is not concentrated and the scattered light is gone. Scattered light causes light to be everywhere, resulting in a gray phenomenon. The cotton screen in front of the infrared light is not tight enough, resulting in a hazy phenomenon.

3. Poor quality of infrared lights, mismatched angle and infrared distance with the lens, resulting in snowflakes

For the convenience of self purchase and installation, many companies use various angles of lighting fixtures. The advantage of this use is that they can hardly use lenses of different millimeter sizes for the same lamp. The disadvantage is that it always makes people feel that the angle and distance of the light are not suitable for the lens. When the angle is not appropriate, it is easy to have a flashlight or narrow current. When the distance does not match, for example, using a 12mm lens but a 10 to 20 meter light, a gray phenomenon will appear, with a blurry distance and snowflakes floating nearby. Also, inferior infrared lights, besides decoration, the more lights there are, the more problems there are; The more concentrated the lamp, the greater the heat generated and the easier it is to burn out.

4. Unreasonable circuit design

Explosion proof infrared camera manufacturers not only need to install the infrared lamp directly into the camera, but also redesign and age the camera circuit before installation. However, many small processing factories in the market use cheap electronic components. Buying cheap infrared lamps can be directly soldered with an electric soldering iron, without the need for redesigning or aging circuits. Other factories that produce low-end products, in order to save money, dismantle the control board of the control circuit or integrate it with the light board, which can easily cause infrared lights to heat up due to unstable current, making low-quality infrared lights unable to work properly.

5. Poor quality built-in camera with extremely high illumination

Many factories artificially increase the sensitivity of CCD in order to obtain brighter images under the same auxiliary light of infrared lamps. Because many manufacturers use very low-quality built-in cameras for price competition, which are brighter when the infrared light is not filled enough, the gain sensitivity of the CCD is artificially increased, just like how we increase brightness on a hard disk recorder, which can easily cause snowflake phenomena.

6. It may be in a dusty outdoor environment
Especially in the wild, it is possible that the infrared lights in the camera shoot out tiny particles that are invisible to the naked eye. Not turning on the infrared lights during the day is not obvious to both the naked eye and the camera. This phenomenon is caused by the environment.
There are many reasons for producing snowflakes, but the methods are always more difficult. As long as you find the real reason, solving it will be much easier, as long as you are willing to spend cost and time.
Solution
1. Use a highly stable transformer to solve the problem of insufficient current, test the voltage and current with a multimeter to ensure the normal operation of the infrared light;
2. Use high-quality infrared lights. This is equally important, even if the infrared light is not good, the current is useless;
3. Replace the inferior camera inside. Perhaps its camera has extremely high illumination, making it prone to snow accumulation in low outdoor brightness, so it is necessary to use a black and white camera or a color to black camera;
4. Adopting a dual filter or dual glass structure to increase the intake of infrared lights at night and avoid the influence of water mist on the lens.