Glass break detector

Details Glass break detector Glass break detector

1987-10-13

1989-06-06

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

310324, 340566, G08B 1304

Patent

active

048375586

ABSTRACT:
A glass break defection system includes a unidirectional acoustic transducer directed toward an area of glass to be monitored. The transducer is narrowband and has a sharp frequency response peak in the 4 to 8 kHz range. An electronic audio discriminator connected to the transducer output is responsive to signals within this frequency range having a predetermined amplitude thereby eliminating ambient or environmental sounds not characteristic of breaking glass. The transducer is mounted in a rectangular enclosure which is pointed at the area to be monitored and comprises a flat circular metallic disk affixed to the enclosure with a piezo electric element affixed to the rear of the metallic disk. The enclosure is tuned to resonate at a frequency characteristic of the sound of breaking glass.

REFERENCES:
patent: 3863250 (1975-01-01), McCluskey, Jr.
patent: 4088989 (1978-05-01), Solomon
patent: 4091660 (1978-05-01), Yanagi
patent: 4134109 (1979-01-01), McCormick et al.
patent: 4196423 (1980-04-01), Carver et al.
patent: 4668941 (1987-05-01), Davenport et al.

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