The high-definition infrared conference camera has outstanding advantages such as long night vision distance, strong concealment and stable performance among surveillance cameras. An excellent high-definition infrared conference camera must be able to have the following five major performances, which are the five must-see factors for the selection of high-definition infrared conference cameras carefully summarized by R & D personnel.
1. Working conditions of infrared lamp
Generally speaking, the infrared lamp radiation power of a high-definition infrared conference camera is proportional to the forward working current, but when it is close to the maximum rating of the forward current, the temperature of the device rises due to the heat consumption of the current, which reduces the light emission power . 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 begins 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 high-definition infrared conference camera infrared light must have a good constant current power supply, good heat dissipation design. ZOOM's zoom MCD, MDD, MED, MBB series cameras are equipped with high-power infrared lamps (up to 24), and use high-power constant current power supply, internal circulation heat dissipation design, which can achieve long-distance night Sight (up to 220 meters away) and the long life of infrared lamps.
2. Fogging and frosting problem of high-definition infrared conference 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 high-definition infrared conference 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 conditions, which causes the camera to be unable to see the objects directly, which directly affects monitoring effect. By adopting advanced electronic defrosting circuit, Zhonglu Communication Company can effectively control the concentration of saturated water vapor in the cavity to achieve automatic defrosting and defrosting.
3. Clean the window glass of high-definition infrared conference camera
The camera works in a rainy, snowy or dusty environment, 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 the invisible wiper window glass. Compared with ordinary window glass, invisible wiper window glass has the function of repelling water, dust and snowflakes.
4. Constant temperature of high-definition infrared conference 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 high-definition infrared conference camera during the entire working period (in 12 hours), that is, the front temperature of the cavity is too high. Even heat dissipation will definitely affect the normal operation of the camera and other components. By designing and using automatic cooling and heating air conditioners with forced heat dissipation and cooling, Zhonglu Communications has solved this problem well. The automatic cooling and heating air conditioner adopts the Peltier effect principle. The temperature measurement control circuit can be automatically adjusted to keep the temperature in the protective cover constant within the normal operating temperature range of the camera. The temperature in the cover is set to be below + 5 ° C for heating and above + 40 ° C cold. Experiments show that the high-definition infrared conference camera can work normally in the outdoor natural environment of -40 ℃ ~ +70 ℃ (direct sunlight).
5. Fully enclosed high-definition infrared conference camera
In addition to the constant temperature, another advantage of using automatic cooling and heating air conditioning is that the high-definition infrared conference 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 large dust Harsh environment, such as large coal mines can also be used normally.
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