The anti-theft alarm system usually consists of three parts: alarm detector (also known as anti-theft alarm), transmission channel and alarm controller. Among them, the alarm detector is a sensing detection device used to detect the intrusion behavior of the intruder and various abnormal situations. The alarm detector is generally composed of sensors and signal processing. It is used to detect the intrusion behavior of the intruder. It is composed of two processing components, including electronic and mechanical. It is the key to the anti-theft alarm system, and the sensor is the core component of the alarm detector. Using sensors based on different principles, alarm detection devices of different types, different uses and different detection purposes can be formed. According to the working principle, the alarm detector can be mainly divided into infrared alarm detectors, microwave alarm detectors, passive infrared/microwave alarm detectors, glass break alarm detectors, vibration alarm detectors, ultrasonic alarm detectors, laser alarm detectors, magnetic switch alarm detectors, switch alarm detectors, video motion detection alarms, sound detectors and many other types. The transmission channel is the channel for the electronic signal of the alarm detector to be transmitted to the outside. At present, there are three ways of transmission, namely wired, wireless, and borrowed lines.
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