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In the past, the fill light used for intelligent traffic monitoring systems was usually filled with several Kilowatts of metal halide lamps. However, the metal halide lamp consumes a lot of power and has a short life span, which can cause serious glare to the driver. Later, a xenon flash lamp (also called a gas flash) is used. Although the helium strobe light fills the camera at night, it also slows the driver’s glare. However, xenon flashers also have the following disadvantages:
1. Because the charging time of the capacitor is slow, the discharge is fast (only 3-5 flashes in one second). When the traffic volume is large, a single Xenon flashing lamp cannot satisfy the fill light, the camera will capture some of the dark image.
2. Short life, good quality The flash life of the xenon flash light is generally only 3 million times, and the quality is less than 300,000 times. Therefore, the monitoring point with a large traffic volume needs to replace several xenon flash lamps within a year.
3. The xenon flash lamp cannot be used for recording because of its own reason, so the xenon flash lamp cannot be used for an electronic* or bayonet item based on a video detection method.
The LED strobe light or LED constant light is used to talk about the LED strobe light, first from the LED constant light fill light, these two kinds of fill light can be used for electronic * or bayonet based video detection program System to fill HD cameras at night.
The so-called LED constant light fill light is not connected to other trigger signals, as long as the power is always on or always bright at night (plus light control circuit) LED fill light.
1, LED lights fill light life longer than the helium strobe lights, but the brightness is less than helium strobe lights and LED strobe lights.
2, the work of heat than the LED strobe light, so the market's LED constant light power is generally only a few tens of watts, the camera is not as good as the LED strobe lights, especially in order to take a clear high-speed moving vehicles After the electronic shutter speeds up, the exposure time of the CCD is shortened, and it is difficult to achieve the fill light requirement. At the same time, it will also cause blindness to the driver. In general, it is the human eye that feels very bright, but the camera's image is not bright.
The use of LED strobe light can be a good solution to the shortcomings of xenon flashing lights and LED constant light fill light. LED strobe lights can be used both for video fill and for fill light.
Why Intelligent Traffic Monitoring System Uses LED Strobe Lights
Adding a fill light to a high-definition camera can improve the night-time performance of the camera; in particular, the high-definition camera is used in an intelligent traffic monitoring system to capture or record illegally and high-velocity vehicles, and to avoid the need to clear the license plate or the cab, avoid Image smearing, you must set the camera's electronic shutter faster. When the electronic shutter is faster, the CCD exposure time of the camera is shortened, which makes the image of the camera that was originally dark at night become darker and the fill light becomes more difficult.