In accordance with the installation of the detector can be divided into: wall, ceiling, mount
According to the detector's range can be divided into: a wide-angle type, curtain type, all-round
In accordance with the detection principle and work can be divided into: infrared, microwave, infrared and Microwave, vibration, smoke, air sense, broken glass, ultrasound and so on.
Wherein the infrared detector can be divided into active infrared and passive infrared, smoke can be divided into ionic and photoelectric.
1, active infrared detectors: an infrared transmitter and an infrared receiver. Infrared transmitter emits a modulated, or the majority of infrared light through toward the infrared receiver. When no obstructions, the detector will not alarm between transmitter and receiver. There are objects blocking, the receiver output signal changes, the detector alarm.
2,passive infrared detectors: There are two key components, a Fresnel lens, the other is the pyroelectric sensor. Any temperature above absolute nature (-273o) objects will produce infrared radiation at different temperatures of objects released by different wavelengths of infrared energy. The body has a constant temperature, there is a difference with the ambient temperature. When the body is moving, this difference varied by the Fresnel lens is the pyroelectric sensor detects to output a warning signal.
3, microwave detector: The principle of the Doppler effect. When the microwave band, when a frequency to transmit, fired out of the microwave encounters an immovable object, the reflected microwave frequency unchanged, that f = f collect hair, the detector does not alarm. When microwaves emitted encountered moving objects, the reflected microwave frequency will change, namely ≠ f f send receive, then microwave detector will send alarm signal.
4, vibration detectors: shock vibration signal detectors detect intruders are various sabotage activities generated as an alarm basis, for example, an intruder during Zaoqiang, drill holes, damage ATM, pry safes and other sabotage activities When will cause vibration of these objects. These vibration signal to trigger an alarm detector is called vibration detectors.
5, dual infrared detectors and four-infrared detectors: the two traits can be the same polarity opposite to the pyroelectric sensor integrates the detector with two detection source is the dual detector. The 4 personality can the same polarity opposite to the pyroelectric sensor together with four detectors to detect the source is the quad detector
6, Shuangjian detectors: In order to overcome deficiencies single technology detectors, usually two different technical principles detectors together, only when the two kinds of sensor detection technology to detect human movement detector when the alarm is called as Shuangjian detector. Common market Shuangjian microwave + passive infrared detector.
7, three Kam detector and four-Kam detector: three Kam detector just some domestic manufacturers and vendors publicity stunt to microprocessor technology as a way to detect. In fact, this can only be considered TriTech detectors. These are the words that count three Kam infrared microwave microprocessor pet anti-masking is not to be called anti-camouflage Six Kam detector? Real three Kam detector must have three kinds of detection technologies, such as: PIR + microwave + ultrasonic probe