Glass break detectors can be divided into two major categories according to their working principles: One is a sound-controlled single-technology glass break detector, which is actually a kind of special purpose (with a bandwidth of 10 to 15 KHz) for frequency selection ( The voice-activated alarm detector that can drive out the high-frequency signals generated when the glass breaks. The other category is dual-technology glass break detectors, which include sound-shock-type and infrasonic-glass broken high-frequency sound types.
The voice control-vibration type combines the two technologies of sound control and vibration detection. Only when the high frequency sound signal emitted by the broken glass and the vibration caused by tapping the glass are detected at the same time, the alarm signal is output.
Infrasound-glass broken high-frequency sound double-technology detector combines the infrasonic wave detection technology and the glass broken high-frequency sound detection technology. Only the high-frequency sound signal and the induced infrasound signal emitted when the glass and the glass are broken are detected simultaneously. Trigger alarm.
Piezoelectric ceramic plate piezoelectric effect (piezoelectric ceramic plate under the action of the external force generated by the distortion, deformation will generate a charge on the surface), can be made into broken glass detector. High-frequency glass broken sound (10k ~ 15kHZ) is effectively detected, and the sound signal below 10kHZ (such as speaking, walking sound) has a strong inhibitory effect. The frequency of the acoustic emission frequency of the glass breakage and the strength are related to the thickness and area of ​​the glass.
The detector is affixed to the door and window glass, and the upper and lower surfaces are connected to the control circuit by wires respectively. Once the glass is struck or broken by gravity, the piezoelectric effect is generated. After being processed by the control circuit, the alarm device will produce a sound and light alarm. This alarm should not be determined by the control circuit. The vibration caused by passing cars, people walking, wind blowing, etc. should be excluded. This reduces the number of false alarms. As small as several tens of square centimeters and as large as several square meters, different thicknesses and specifications of glass can be used. When installing, it should be noted that the paste is firm and reliable, and if it is used together with a switch-type alarm, the effect is better. It is the most simple and practical set of good anti-theft alarm system that integrates door lock control in residential buildings.
The glass breakage detector should be as close as possible to the glass to be protected, as far as possible away from sources of noise interference, such as sharp metal impact sounds, ring tones, whistle whistle, etc., to reduce false alarms.
The voice control-vibration type combines the two technologies of sound control and vibration detection. Only when the high frequency sound signal emitted by the broken glass and the vibration caused by tapping the glass are detected at the same time, the alarm signal is output.
Infrasound-glass broken high-frequency sound double-technology detector combines the infrasonic wave detection technology and the glass broken high-frequency sound detection technology. Only the high-frequency sound signal and the induced infrasound signal emitted when the glass and the glass are broken are detected simultaneously. Trigger alarm.
Piezoelectric ceramic plate piezoelectric effect (piezoelectric ceramic plate under the action of the external force generated by the distortion, deformation will generate a charge on the surface), can be made into broken glass detector. High-frequency glass broken sound (10k ~ 15kHZ) is effectively detected, and the sound signal below 10kHZ (such as speaking, walking sound) has a strong inhibitory effect. The frequency of the acoustic emission frequency of the glass breakage and the strength are related to the thickness and area of ​​the glass.
The detector is affixed to the door and window glass, and the upper and lower surfaces are connected to the control circuit by wires respectively. Once the glass is struck or broken by gravity, the piezoelectric effect is generated. After being processed by the control circuit, the alarm device will produce a sound and light alarm. This alarm should not be determined by the control circuit. The vibration caused by passing cars, people walking, wind blowing, etc. should be excluded. This reduces the number of false alarms. As small as several tens of square centimeters and as large as several square meters, different thicknesses and specifications of glass can be used. When installing, it should be noted that the paste is firm and reliable, and if it is used together with a switch-type alarm, the effect is better. It is the most simple and practical set of good anti-theft alarm system that integrates door lock control in residential buildings.
The glass breakage detector should be as close as possible to the glass to be protected, as far as possible away from sources of noise interference, such as sharp metal impact sounds, ring tones, whistle whistle, etc., to reduce false alarms.
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