Patent ID: 7323979
Filing Date: 2008-01-29
Classification: G08B

Abstract:
1. A dual technology glass breakage detector for a security system that detects the breaking of glass in a window or door comprising: an acoustic glass breakage sensor for detecting a sound of breaking glass within a premises protected by the security system, said acoustic glass breakage sensor is not mounted on a glass window or door; an impact sensor mounted on the glass window or door for detecting a physical/mechanical impact to the glass of the window or door to verify that there is a physical/mechanical impact to the glass window or door said acoustic glass breakage sensor and the impact sensor are separately mounted at a fixed remote distance from each other, wherein the security system includes a control panel, the impact sensor, upon sensing a physical/mechanical impact to the glass of the window or door consistent with that required to break the glass, transmits a first enable signal to the control panel and the acoustic glass breakage sensor, upon acoustically detecting a sound indicative of breaking of glass, transmits a second enable signal to the control panel, said control panel annunciates an alarm signal only after the receiving said first and second enable signals from both the acoustic glass breakage sensor and the impact sensor, such that the impact sensor prevents the annunciation of false alarms from sounds that might fool the acoustic glass breakage sensor, and the acoustic glass breakage sensor prevents the annunciation of false alarms from impacts to the glass window or door that do not result in breakage of glass.