Structure-borne sound detector for an intruder alarm system

Details Structure-borne sound detector for an intruder alarm system Structure-borne sound detector for an intruder alarm system

1995-01-19

1997-02-11

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

310332, G08B 1300

Patent

active

056025297

ABSTRACT:
The detector contains a structure-borne sound microphone connected to an electronic evaluation unit with a piezoelectric sensor (18) for structure-borne sound vibrations. This sensor has a vibrating bar (28), which is attached by means of hybrid technology to a carrier (27). The vibrating bar (28) is formed by a bimorph element and the carrier by an electrically conductive ceramic wafer.

REFERENCES:
patent: 4197479 (1980-04-01), Gudzin
patent: 4290058 (1981-09-01), Bystricky
patent: 4678957 (1987-07-01), Harnden, Jr. et al.
patent: 4698541 (1987-10-01), Bar-Cohen
patent: 4755706 (1988-07-01), Harnden, Jr. et al.
Philips Components Catalog, "Piezokeramik" (Philips AG Components 1990/91, pp. 15.9, 15.19 and 15.20.

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