Glass breakage detector

Abstract

Abstract An alarm for sensing glass breakage having a solid state electronic shock sensor positionable on a sheet of glass and connected through a variable resistance circuit and a threshold detector SCR to a signaling device to detect the breakage of glass. The shock sensor is formed of a number of layers of materials including a piezoelectric material bonded by an electrically conductive epoxy to an electrically conductive sheet of material, such as copper, which in turn is positioned against a layer of epoxy glass, which is joined by a layer of catalyzed epoxy to a plastic case having a layer of adhesive polyurethane formed on the outside. The plastic case is mountable on a sheet of glass and when the glass is broken, the shock waves indicating breakage are transmitted through the layers of materials, which function to attenuate the signals outside the band of shock waves, to the piezoelectric material which generates an electrical signal which is transmitted via the variable resistor circuit to the threshold detector SCR to the signaling device to signal breakage of the glass.

Inventors

• 👤 Jr Arthur Mccluskey

Bibliographic Details