Acoustic glass breakage detectors react to airborne noise and are installed in the area around the glass surface to be monitored. They have a built-in microphone and react to characteristic frequencies that arise when a glass breaks.
A piezoelectric sensor reacts to typical glass break vibrations in the range of around 100 kHz that occur when the pane is destroyed. Triggering by knocking on the glass pane is not built-impossible.
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