Infrared hunting cameras and infrared camera in the surveillance cameras with night vision distance, strong concealment, stable performance and outstanding advantage, thus occupied most of the market in the night vision surveillance.How to identify strengths and weaknesses in mixed infrared hunting camera market?Good performance of the infrared camera must be able to have the following properties:
1.Infrared lamp working conditions
In general, the infrared lamp radiation power is proportional to the positive working current, but near to the maximum rating of forward current, the temperature of the device for current heat consumption to rise, make the light emitting power decrease.Infrared diode current is too small, will affect the radiation power of the play, but the working current overshoot affects its life, and even make the infrared diode burned.When the voltage across the positive threshold voltage (0.8 v) current to flow, to movement, and it is a steep curve, show that the requirements of the working current is very sensitive.Therefore requires working current and accurate, stable, otherwise influencing the full play of the radiation power and reliability.Radiation power with the temperature increasing of environment (including its own heat generated by the environment temperature) makes its radiation power decline. Infrared lamp especially long-distance infrared lamp, heat loss is a problem that should be paid attention to during the design and selection.
2.The infrared light utilization and red critical problems
What is a red storm? Red storm is due to the ir ingredients contained in the visible light. Infrared lamp can be totally without red violence (in 940 ~ 950 nm wavelength infrared tube) or only a faint red binge.Using the American oakes (aucsiter) infrared technology, through on the premise of guarantee the lamp power, reduce the heat consumption of infrared lamp itself, adjust the Angle of infrared light, infrared lamp effective utilization rate reached 90%.Infrared hunting cameras and on the choice of infrared lamp, choose the larger wavelength (910 nm) infrared lamp, strictly to reduce the red storm, reached the reddish critical effect.
3.The fog in the infrared camera
Fog, frost formation is due to the saturated water vapour met with cold air condenses, because of the cold environment is strong, the weak condense into frost and fog. Infrared cameras in the process of work, the infrared hunting camera especially outdoor camera is often due to change of the four seasons, the temperature difference between day and night, and the rain and snow conditions in shield to form fog or frost on the window glass, cause the camera to see objects, directly affect the monitoring results. Through the use of advanced electronic circuit of defrosting, effective control of saturated water vapor concentration in the body cavity, do the mist defrost automatically.