Ten Intrusion Detectors Introduction

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1) Passive infrared intrusion detector 1 What is a passive infrared intrusion detector? When the human body moves within the detection range, the detection device that causes the received infrared radiation level to change and can generate an alarm state is called a passive infrared intrusion detector.

This is a detector used for indoor guarding. According to different installation locations, it can be divided into two types: wall-mounted and ceiling-mounted.

2 Use of passive infrared intrusion detectors Note a. When a small animal such as a mouse moves within the detection range, it also causes the infrared radiation level received by the passive infrared intrusion detector to change to generate an alarm state, causing a system error. Rate alarm.

b. When the temperature near the room temperature or near the detector is close to the human body temperature, the sensitivity of the passive infrared intrusion detector is reduced, which also causes the system to leak alarm.

c. It is not allowed to place or place any objects whose temperature will change rapidly near the detector or on the opposite side, such as air conditioners and electric heaters. Prevents false alarms due to hot gas flow.

d. Infrared penetrating ability is very poor, so passive infrared intrusion detector can not be set any shield before, otherwise it will cause the system to leak alarm.

e. Strong electromagnetic field interference can easily cause false alarms by the detector, especially for users who are closer to radio stations and television stations.

f. Any direct source detectors should be prevented, otherwise the system is susceptible to false alarms.

g. Regularly (usually no more than three months) imitate the movement of intruders within the detection range to check the sensitivity of the detector and adjust or repair if problems are found.

h. Pay attention to protect the light transmission system of the detector and avoid scratching with hard objects or nails. When it is stained with dust, it can be blown away with a suction earball. If you use lens paper to wipe off dust, you must ensure that the direction and angle of the detector are the same as those before wiping.

(2) Magnetic switch detector 1 What is a magnetic switch detector? A device consisting of a reed tube (reed switch) and a permanent magnet is called a magnetic switch detector (commonly known as a door magnet). When the magnet moves away from the reed pipe by a certain distance, it causes a change in the state of the switch, and the control circuit can issue an alarm signal.

Magnetic switch detector contact points can be divided into:

H type: Normally open contact type D: Normally closed type contact type Z: Switch type contact 2 Magnetic switch detector Precautions for use (H type as an example).

a. The staff in the fortification area must insert the doors and windows after work, otherwise the system will alarm due to the shaking of the doors and windows.

b. Pay attention to check the gap between the tongue and the magnet (especially in the season). Excessive clearance may cause false alarm; too small friction will damage the reed.

c. Reed contact, sometimes there will be adhesion, at this time the system is prone to leak alarm. Should pay attention to regularly open the window to check the working status of the system and find problems in a timely manner.

d. If the contact of the reed switch is bad, the system will alarm frequently. This indicates that the reed switch has been damaged.

e. In the vicinity of the magnetic switch detector, there can be no strong magnetic field, so as not to affect the normal operation of the magnetic switch detector.

(3) Active infrared intrusion detector 1 What is the active infrared intrusion detector The infrared radiation beam between the transmitter and the receiver is completely or greater than the detection device capable of generating an alarm state when a given percentage is interrupted, called active Infrared intrusion detector.

Active infrared intrusion detectors are generally composed of separate transmitters and receivers. Transmitters and receivers are installed separately.

2 Active infrared intrusion detectors use precautions a. Active infrared intrusion detectors are wire-controlled detectors, appropriate to disguise in use is appropriate.

b. Active infrared intrusion detectors are greatly affected by climate when they are used outdoors. In case of bad weather such as fog, snow, rain, and sand, the visibility of the atmosphere will be reduced, and the active infrared intrusion detector will have a shorter distance. The system is prone to false alarms. In this case, we must strengthen our vigilance and ensure safety.

c. The sensitivity of the active infrared intrusion detector is normally adjusted at the factory (usually the shortest shading time for triggering the alarm is set at about 10-2 seconds), users can not adjust by themselves, once the sensitivity is too high (easily error alarm ) or too low (easily leak alarm), it should promptly notify the relevant personnel to overhaul.

d. When the windshield shakes the infrared beam, it may easily cause the system to alarm.

e. When active infrared intrusion detectors are used indoors, the curtain movements can easily block the infrared beam and cause false alarms. The on-site staff must insert the windows after work.

f. The surface of the lens is exposed to air and is easily contaminated. Always wipe it with lens paper to ensure normal operation of the detector.

(4) Sound review device 1 What is a sound review device A device that is used to listen to an intruder's movement in a precautionary area or to steal and break activities (such as shackles, opening doors and windows, carrying, disassembling, etc.)? Sound review device. The sound review device is used in conjunction with other detectors. The function in the system is the alarm review, that is, the alarm system monitors the live sound after the alarm, so as to identify the authenticity of the alarm, it is also called the listener.

2 Precautions for using sound review devices a. The sound review device can only be used with other detectors.

b. When the acoustic environment of the vigilance site changes, the sensitivity of the sound review device must be adjusted. For example, the warning zone has never been carpeted and covered with thick carpets; never hung curtains to hang thicker curtains; and there has been a large increase in the number of goods from less goods to goods.

(5) Vibration intrusion detector 1 What is vibration? The intrusion detector is a device that can generate an alarm signal to the intruder-induced mechanical vibration within the detection range. It is called a vibration intrusion detector. Current vibration detectors used in security systems include contact type, piezoelectric ceramic type, and electric vibration detectors (earth sound detectors). FIG. 8 is a schematic structural view of an electric vibration detector.

2Vibration Intrusion Detector Usage Cautions a. Do not move a vibrating object (such as a refrigerator) to the area where the vibration detector is installed. Otherwise, it will cause a false alarm.

b. The use of electric vibration detectors (earth sounding detectors) in the outdoors, especially mud lands, will reduce the sensitivity of the detectors in the rainy season (soft soil) and winter (freezing of soil). Users should take other warning measures.

c. The electric vibration detector is easy to wear between the magnet and the coil. Generally, it needs to be checked once every six months. The time interval for checking in the wet place should be shortened.

(6) Microwave Doppler-type intrusion detector 1 What is a microwave Doppler-type intrusion detector According to the principle of Doppler, electromagnetic waves with a radiation frequency greater than 9GHz cover a certain range, and can detect human bodies moving within the range. The device that generates an alarm signal is called a microwave Doppler type intrusion detector.

2 Microwave Doppler Intrusion Detector Usage Precautions a. There should be no movement and possible movement of objects in the prevention area. Otherwise, the system will cause false alarms.

b. The microwave penetrates the non-metallic objects very well. If the outdoor moving object causes the system to alarm, it can be solved by adjusting the sensitivity of the detector.

c. The microwave is very reflective to metal objects. Metal objects (such as metal cabinets, etc.) have a blind spot on the back. The user should pay attention to the resulting leak alarm.

d. High-frequency electromagnetic waves, especially the launch and stoppage of television stations, can easily cause false alarms in the system.

(7) Microwave-Passive Infrared Composite Intrusion Detector 1 What is Microwave-Passive Infrared Composite Intrusion Detector combines microwave and passive infrared in one unit, and when both sense the movement of the human body, they are all in alarm at the same time. The device that only issued an alarm signal at the time was called a microwave-passive infrared composite intruder. Also called microwave-passive infrared dual technology intrusion detector or microwave-passive infrared double detector. The following two figures are the physical maps of the wall-mounted microwave-passive infrared double detector and the ceiling-mounted microwave-passive infrared double detector respectively.

2 Microwave-Passive Infrared Composite Intrusion Detector Usage Precautions a. There must be no obstructions and possible obstructions in front of the detector.

b. Behind the metal or non-metallic furniture is the detector's blind spot, which should prevent the system from generating a leak alarm.

c. Prevent false alarms caused by small animals (such as rats).

(8) Voice-activated single-technology glass breakage detector 1 What is the voice-activated single-technology glass breakage detector? It responds to high-frequency (10KHz~15KHz) sound signals generated when the glass is broken and enters an alarm state device, called sound control. Single technology glass break detector.

General window glass, window glass, etc. are the object of protection of the detector.

2 Acoustic Control Single Technology Glass Breakage Detector Usage Notes a. Ease of use of electric ringtones, metal percussive sounds, etc. Possibilities The system of this detector generates false alarms.

b. When there is a great change in the acoustic environment of the room being guarded, such as hanging thick curtains or accumulating high cargo, the sensitivity of the controller should be adjusted. The sensitivity of the glass break detector can be adjusted with a glass crush simulator.

(9) Sound control-vibration dual technology glass breakage detector 1 What is called sound control-vibration dual technology glass breakage detector Combining voice-activated single-technology glass breakage detection with piezoelectric vibration detection, combined only when detected simultaneously The high-frequency sound signal emitted when the glass breaks and the vibration signal caused by striking the glass can enter the device in the alarm state. Compared with the double-technology glass break detector, the sound-control-vibration can effectively reduce the false alarm rate and increase the invasion rate. The reliability of the alarm system. Figure 11 is a physical image of this dual technology detector.

2 Sound-vibration-vibration dual-technology glass breakage detectors Precautions for use Regularly simulate acoustic signals and vibration signals generated when the glass breaks, and check the detector sensitivity. When the indoor acoustic environment changes greatly, the detector sensitivity should be adjusted in time.

(10) Sound-infrasound dual-technology glass break detector combines sound-activated single-technology glass breakage detection with infrasound detection. Only when the high-frequency sound signal and the resulting infrasound signal are detected at the same time when the glass breaks, The device that can enter the alarm state is called the sound control-infrasonic dual-technology glass break detector.

When the glass is broken, in addition to generating high-frequency sound signals and vibration signals, the infrasound waves of 0.5 Hz to 5 Hz are generated due to the pressure difference between the inside and outside and the air near the glass is compressed.

The glass break detector capable of detecting the high frequency sound signal and the infrasound wave signal generated when the glass breaks down has been further improved in performance compared with the sound-control-vibration double-technology glass breakage detector. The current level is a better glass break detector.

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