What are the conditions for an excellent infrared dome camera?
Infrared dome cameras are cameras with infrared lamps. They are used in dimly-lit or dark environments. They have outstanding advantages such as long-range night vision, strong concealment, and stable performance, 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, infrared dome camera infrared radiation power is proportional to the forward operating current, but close to the maximum rated current of the forward current, the temperature of the device due to heat dissipation of the current rise, so that the optical power drop. 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 hemisphere infrared lamps must have good constant current power supply and 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. The utilization of infrared light and red storm problem <br> <br> red storm What is it? 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.
Fogging mist frosting problem <br> <br> 3. IR dome camera, is due to the formation of frost in the air saturated water vapor condensed cold, cold environment due to strong and weak, respectively condensed into frost and fog. In the work process of infrared dome 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, which can cause cameras to 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. IR Dome of the window glass clean <br> <br> cameras in rain or snow or dusty environment, the protective cover of the window glass is prone to dirt, causing the camera line of sight blocked. 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.
The IR dome camera thermostat <br> <br> large amount of heat due to the configuration of the infrared lamp, infrared lamp after starting, the entire working period (of 12 hours) in the front portion of the dome camera infrared heat is concentrated there That is, the temperature at the front end of the cavity is too high. If it cannot be cooled evenly, it 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 camera can work normally in the outdoor natural environment of -40°C to +70°C (direct sunlight).
6. Infrared hemispheres are fully enclosed
In addition to the constant temperature, another advantage of using the automatic air conditioning system is that the infrared dome 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.
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