The performance of infrared dome camera with excellent performance

Infrared cameras have outstanding advantages such as long night vision distance, strong concealment, and stable performance among surveillance cameras, so they occupy most of the market in CCTV night vision surveillance. How to distinguish the advantages and disadvantages in the complicated infrared hemisphere camera market? The infrared dome camera with good performance must be able to have the following performance:

A. Working conditions of infrared lamps

In general, the radiant power of the infrared lamp is proportional to the forward operating current, but when the maximum rating of the forward current is approached, the temperature of the device rises due to the heat consumption of the current, causing the light emission power to decrease. Infrared diode current is too small, it will affect the performance of its radiated power, but too large operating current will affect its life, and even burn the infrared diode. When the voltage crosses the positive threshold voltage (about 0.8V), the current starts to flow, and it is a very steep curve, indicating that its working current requirement is very sensitive. Therefore, the working current is required to be accurate and stable, otherwise it will affect the performance of the radiated power and its reliability. The increase in radiant power with ambient temperature (including the increase in ambient temperature due to its own heat) will cause its radiant power to decrease. Infrared lamps, especially long-distance infrared lamps, heat consumption is a problem that should be noted when designing and selecting. Therefore, the use of infrared lamps must have a good constant current power supply, good heat dissipation design

B. Infrared light utilization and red storm

What is a red storm? Red storms are caused by the visible infrared light contained in the emitted infrared light. Infrared lamps can be completely free of red bursts (using 940-950nm wavelength infrared tubes) or only weak red bursts.

C. Fog and frost problem of infrared camera

The formation of fog and frost is caused by the condensation of saturated water vapor in the air, which is condensed into frost and fog due to the strength and weakness of the cold environment. During the work of infrared cameras, especially outdoor cameras, fog or frost is often formed on the window glass of the protective cover due to seasonal changes, day-night temperature differences, and rain and snow environments, which causes the camera to be unable to see the objects directly, which directly affects the monitoring effect.

D. Infrared camera window glass cleaning

Infrared dome cameras work in rainy, snowy or dusty environments, and the window glass of the protective cover is prone to dirt, causing the camera's sight to be blocked. The solution is usually to add a wiper on the protective cover and clean the glass by controlling the wiper; another method is to use an invisible wiper window glass. Compared with ordinary window glass, invisible wiper window glass has the function of repelling water, dust and snowflakes.

E. Constant temperature of infrared camera

Due to the configuration of the infrared lamp with large heat generation, after the infrared lamp is started, there will be heat concentration in the front of the infrared hemisphere camera during the entire working period (in 12 hours), that is, the front temperature of the cavity is high, if the heat can not be even It will affect the normal operation of the camera and other components.

F. Fully enclosed infrared camera

In addition to the constant temperature, another advantage of using automatic cooling and heating air conditioners is that the infrared camera can be made fully enclosed without leaving any heat dissipation holes to prevent the entry of dust, moisture, and corrosive gases, so that it can adapt to harsh environments with large dust Such as large coal mines can also be used normally.