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The microwave detector is composed of a microwave transmitter and a microwave receiver, wherein the microwave transmitter is composed of a modulation signal control circuit, a microwave generator, an array transmitting antenna and a detector casing; the microwave receiver is received by the detector casing and the array. Antenna, signal detector, signal analysis and alarm control circuit. When the detector is working, the microwave transmitter emits a modulated microwave beam through the array antenna. After the microwave receiver reliably receives the modulated microwave signal from the microwave transmitter through the array antenna, the signal received by the microwave receiver remains unchanged. When the amount of change is insufficient to reach the threshold of the receiver output alarm signal, the receiver remains in a stable normal working signal output state; at this time, an invisible spindle shape is formed between the microwave transmitter and the microwave receiver. The stereoscopic protection area (microwave wall), the height and width of the microwave wall are determined by the beam angle formed by the array antenna of the microwave transmitter and the microwave receiver. The effective detection distance of the detector is determined by the transmission power, beam angle and microwave of the microwave transmitter. Determined by the sensitivity of the receiver;
When an object passes or stops from the microwave defense line formed by the microwave transmitter and the microwave receiver, the signal received by the microwave receiver changes, and when the amount of change reaches the alarm threshold set by the receiver, the state of the microwave receiver output signal occurs. Change (generate an alarm).
Microwave detectors generally use X-band or K-band microwaves as the source of detection signals. Due to the high penetration of microwaves, microwaves are difficult to be affected by the natural environment and cause false alarms when used outdoors. Therefore, the early stage of microwave radiation was mainly used as a perimeter anti-intrusion detector for military, petroleum, key industrial units and key protection units. Since there are very few enterprises in China that actually develop and produce microwave radiation detectors, microwave detectors have always been monopolized by foreign companies. The foreign microwave radiation is very expensive in China, and the debugging process is very complicated.
Viandas is a national brand specializing in intrusion detection and alarm systems. Viandas has all-digital microwave radiation. It has a number of patented technologies: 耙-type algorithm and debugging mode, not only the detection distance is long, the work is stable, and the debugging is very simple. Users can quickly debug without any external tools. Viandas Microwave is currently widely used in many prisons, detention centers, oil depots, power stations, museums, etc., and plays an important role in the wisdom of the domestic judicial system.