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| How can the anti-theft alarm reduce the false alarm rate? |
| 2021.04.28 |
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The false alarm in the use of anti-theft alarms makes users feel very troubled. There are many types of anti-theft alarms. How to choose to reduce the false alarm rate?
1. Glass break detector: It uses a piezoelectric microphone and is installed at the position facing the glass. Since it only effectively detects high-frequency glass breaking sound, it will not be affected by the vibration of the glass itself and cause a reaction.
2. Infrared detector: Any object will radiate infrared rays of varying intensity due to the difference in surface heat.
Infrared detection is mainly used to detect the human body and some other intrusive moving objects. When the human body enters the detection area, the stable thermal radiation is destroyed and a changing thermal radiation is generated. After the infrared sensor receives it, it amplifies, processes, and sends out an alarm signal. Dual-element infrared detector, using microprocessor, optional pulse counting, detection distance. It adopts the lower window design, which can eliminate the detection dead angle, automatic temperature compensation in all directions, and super anti-false alarm ability. Optional alarm output NC/NO, adapt to different alarm hosts, metal shielding cover, anti-electromagnetic interference.
3. Infrared microwave detector: It is one of the commonly used equipment in the alarm system. Its working principle combines infrared and microwave. When the infrared and microwave detectors have alarm signals at the same time, the probe will have an alarm output, which reduces the possibility of false alarms. There are many types of infrared microwave probes, corresponding to different detection distances. Ceiling type three-technology passive infrared/microwave detector.
4. Microwave object motion detector: It uses the Doppler frequency shift of high-frequency radio waves as a detection method, which is suitable for open spaces or squares. Microwave is a very high-frequency radio wave with a short wavelength and is easily reflected by objects. According to the frequency drift of the incident wave and the reflected wave, invading objects can be detected.
5. Door magnetic detector: It is a widely used, low cost, convenient installation, and does not require adjustment and maintenance. The door magnetic switch is divided into movable parts and output parts. The movable parts are installed on the movable doors and windows; the output parts are installed on the corresponding doors and windows, and the installation distance between the two is not more than 10 mm. There are two lines on the output component, the normal state is normally closed output, and the door and window are open for more than 10 mm, and the output is converted to normally open.
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