Glass breakage detector

Details Glass breakage detector Glass breakage detector

1991-02-11

1992-05-26

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340566, G08B 1300

Patent

active

051172208

ABSTRACT:
A glass breakage detector utilizes a single microphone or piezoelectric element as a transducer to detect both the structurally-transmitted vibrations and airborne sounds indicative of breaking glass. The structurally transmitted component and airborne component are combined in accordance with a time-dependent function to provide an indication of breaking glass which has a low false alarm rate.

REFERENCES:
patent: 4091660 (1978-05-01), Yanagi
patent: 4180811 (1979-12-01), Yoshimura et al.
patent: 4195286 (1980-03-01), Galvin
patent: 4383250 (1983-05-01), Galvin
patent: 4668941 (1987-05-01), Davenport et al.
patent: 4853677 (1989-08-01), Yarbrough et al.
patent: 4928085 (1990-05-01), DuRand, III et al.

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