Dual channel glass break detector

Details Dual channel glass break detector Dual channel glass break detector

G - Physics

08

B

G08B 13/04 (2006.01) G08B 13/22 (2006.01)

Patent

CA 2117474

A glass break detector for detecting the breaking of a window or the like comprises an acoustic transducer (XI) having a wide band frequency response, coupled to a dual channel filter and signal processing circuit. A low frequency channel (10, 20) detects an initial positive compression wave caused by the inward flex of the window and a high frequency channel (40, 50) detects the acoustic spectrum which is characteristic of breaking glass. The two channels are combined in a logic circuit (30, 60) that is timed so that the low frequency positive flex is detected initially with the high frequency component following shortly thereafter. If both timing conditions are fulfilled, an alarm (100) is initiated. Additional circuitry (70, 80, 90) is provided to inhibit the alarm if a negative compression wave is initially detected. The detection sequence is initiated by a loud sound characteristic of breaking glass.

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