There are Xue Huadian reasons for infrared surveillance cameras to monitor at night. What should I do if I spy on Xue Huadian at night?

According to users' feedback, infrared surveillance cameras have many Xue Huadian besides common whitening and glare. At night, the snow is like snow. So, by doing various experiments, I tried to change the infrared lamp and circuit board, tried to change the CCD, and went to different places to do experiments. Later, the Pacific Safety Net came to the conclusion that there were several reasons for the emergence of Xue Huadian.

There is a reason for Xue Huadian to use infrared surveillance cameras for night surveillance.

First of all, the reason why Xue Huadian lacks electricity.

Some outdoor short-distance use of 12V centralized power supply is convenient, but long-distance use of 12V centralized power supply is not suitable for switching power supply. First, the long-distance infrared lamp generates a lot of heat, and the unstable power supply of 12V may lead to insufficient power, and there is no built-in heat sink, which is easy to burn out in the case of unstable current. Second, the current decays quickly, which may cause the infrared lamp to fail to work normally. Moreover, due to the high illuminance of CCD, the auxiliary light of the infrared lamp cannot be obtained, so snowflakes fly.

Second, the quality of infrared lamp is poor, and the angle and infrared distance of infrared lamp do not match with the lens, which leads to snowflake fluttering.

In order to facilitate their own procurement and installation, many companies use lamps from different angles together. The advantage of this kind of use is that they can use lenses with different millimeter sizes for almost the same lamp. The disadvantage is that people always feel that the angle and distance of the lamp are not suitable for the lens. Inappropriate angle, prone to flashlight phenomenon or narrow electricity phenomenon. When the distance doesn't match, for example, if you use a lens of 12MM instead of a lamp of 10 to 20m, it will be gray, with a blur in the distance and snowflakes fluttering nearby. Also, inferior infrared lights, in addition to decoration, the more lights, the more problems; The more concentrated the lamp, the greater the calorific value, and the easier it is to burn out.

Third, the issue of handicrafts.

Many manual installation, infrared light is not concentrated, astigmatism. Scattered light causes light everywhere, a gray phenomenon. The cotton in the infrared front end is not tight, so it is a boundless phenomenon.

Fourth, the built-in sub-infrared surveillance camera has extremely high illumination.

Many factories artificially increase the sensitivity of CCD in order to get brighter images under the same infrared lamp auxiliary light. For the sake of price competition, many manufacturers use very inferior camera built-in. This kind of camera artificially increases the gain sensitivity of CCD under the condition of insufficient infrared light in order to make it brighter, just like we increase the brightness on the hard disk video recorder, which is prone to snowflake phenomenon.

5. Unreasonable circuit design

The manufacturers of infrared surveillance cameras not only need to install infrared lamps directly into the cameras, but also need to redesign and age their camera circuits before installation. However, many small processing plants in the market only use cheap electronic components, buy cheap infrared lamps and weld them directly with electric soldering iron, without redesigning or aging the circuits. In other factories that make low-end products, in order to save money, the control board of the control circuit is removed or integrated with the lamp board, which easily leads to the infrared lamp heating due to unstable current, making the already inferior infrared lamp even more unable to work normally.

Sixth, it may be in a dusty environment outside.

Especially in the wild, it is possible that the infrared lamp in the infrared monitoring camera emits fine particles that cannot be seen by the naked eye, and it cannot be seen by the naked eye and the camera when the infrared lamp is not turned on during the day. This phenomenon is caused by the environment.

What if there is Xue Huadian in the infrared surveillance camera at night?

There are many reasons for Xue Huadian, but the solution is always more difficult than it is. As long as you find the real reason, it will be much easier to solve it, as long as you are willing to spend the cost and time.

1. Solve the problem of insufficient current with high stability transformer, and test the voltage and current with multimeter to ensure the normal operation of infrared lamp.

2. Use high-quality infrared lamps. This is equally important, the infrared lamp is not good, and even the best current is useless.

3. Replace the inferior camera inside. It may be that the illumination of the camera is extremely high, and it is easy to appear snowflakes when the brightness of outdoor light is not high, so use a black-and-white camera or a color-to-black camera.

4. Adopt double filter or double glass structure to improve the light input of infrared lamp at night and avoid the influence of water mist on the lens.