Infrared cameras have outstanding advantages such as long-range night vision, strong concealment, and stable performance in surveillance cameras, thus occupying most of the market in CCTV night vision surveillance. How to identify the advantages and disadvantages of the infrared hemisphere camera market? A good performance IR dome camera must have the following capabilities:
1. Infrared lamp operating conditions . In general, the infrared lamp radiation power is proportional to the forward operating current, but near the maximum rated value of the forward current, the temperature of the device rises due to the heat dissipation of the current, and the optical emission power decreases. Infrared diode current is too small, it will affect the radiated power to play, but the operating current is too large will affect its life, and even make the infrared diode burned.
When the voltage crosses the positive threshold voltage (about 0.8V or so), the current begins to flow, and it is a very steep curve, indicating that its operating current requirements are very sensitive. Therefore, it is required that the operating current is accurate and stable, otherwise it will affect the performance and reliability of the radiation power. The increase in radiated power with the ambient temperature (increased ambient temperature due to its own heat generation) will reduce its radiated power. Infrared lamps are particularly long-range infrared lamps. Heat consumption is a problem that should be considered when designing and selecting.
Therefore, the use of infrared lamps must have a good constant current power supply and a good heat dissipation design. Midway Communications' zoom MCD, MDD, MED, and MBB series cameras have installed high-power infrared lamps (up to 24) and are powered by a high-power constant-current power supply. The internal circulation heat dissipation design enables them to reach remote nights. According to the effect (up to 220 meters) and the long life of infrared lamps.
2. Infrared light utilization and red storm issues . What is Redstorm? Redstorm is due to the fact that the emitted infrared light contains visible light components.
Infrared lamps can be completely red-free (using 940-950nm wavelength infrared tube) or only a weak red storm. Middle Road Communications adopts AUCSITER infrared technology to reduce the infrared lamp's own heat consumption and to adjust the angle of infrared light to ensure that the infrared lamp's effective utilization rate reaches 90%. In the selection of infrared lamps, infrared light with a relatively large wavelength (910 nm) was selected, and red storms were strictly reduced to achieve a reddish effect.
3. Infrared camera fogging and frosting problems . The formation of fog and frost is caused by the condensation of saturated steam in the air, which is condensed into frost and fog due to the strong and weak cold environment. In the work process of infrared cameras, especially outdoor cameras often cause fog or frost on the protective window glass due to seasonal changes, temperature difference between day and night, and rain and snow conditions. As a result, cameras cannot see objects and directly affect the monitoring results. Midway Communications adopted the advanced electronic defrosting circuit to effectively control the saturated water vapor concentration in the chamber and achieved automatic defogging and defrosting.
4. The infrared glass window glass is clean . Infrared dome cameras work in rainy, snowy or dusty environments, and the window glass of the protective cover is prone to dirt, which can block the camera's line of sight. The solution is usually to add a wiper to the hood, and to control the wiper to clean the glass; another option 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 snow. 5. The constant temperature of the infrared camera As the infrared lamp is configured to generate a large amount of heat, after the infrared lamp is started, during the entire working period (in 12 hours), there will be heat concentration in the front of the infrared dome camera, that is, the temperature of the front end of the cavity is High, if not uniformly cooled, will affect the normal operation of the camera and other components. Middle Road Communications Co., Ltd. has solved this problem by designing and using an automatic air-conditioning system with forced cooling and cooling.
Automatic cooling and air conditioning adopts Peltier effect principle, temperature measurement control circuit can be automatically adjusted, the temperature inside the protective cover is constant within the normal operating temperature range of the camera, the temperature inside the cover is set at +5°C below the heating, +40°C above cold. Experiments show that the infrared hemisphere camera can work normally in an outdoor natural environment of -40°C to +70°C (direct sunlight).
6. The infrared camera is fully enclosed . In addition to the constant temperature, another advantage of using an automatic air conditioning system is that the infrared camera can be made fully enclosed, without leaving any cooling holes to prevent the entry of dust, moisture, and corrosive gases, enabling it to adapt to the harsh environment of dust. Such as large coal mines can also be used normally.
The above information is provided by Shenzhen Blue Vision Intelligent Technology Co., Ltd.