Apparatus for detecting and signalling the fall of bodies in wat

Details Apparatus for detecting and signalling the fall of bodies in wat Apparatus for detecting and signalling the fall of bodies in wat

1990-02-12

1991-08-20

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310345, H01L 4104

Patent

active

050417525

ABSTRACT:
An apparatus is provided for signalling the falling of bodies in water, comprising a piezo-electric cell for detecting frequency waves less than or equal to 5 Hz and comprising, in a case, a sensor formed of a membrane and a piezo-electric cell connected to a signal amplification and management circuit, in which the effects produced by disturbing frequencies not representative of bodies falling in water, are eliminated, wherein the effects produced by disturbing frequencies are eliminated by dumping or attenuating the frequencies higher the 5 Hz by placing, in the center between membrane 2 and the piezo-electric element 4, an elastomer disk 11 with a Shore hardness between 20 and 25 and forming an elastomer bridge.

REFERENCES:
patent: 2430013 (1947-11-01), Hansell
patent: 2942247 (1960-06-01), Lienau et al.
patent: 4054808 (1977-10-01), Tanaka
patent: 4374377 (1983-02-01), Saito et al.
patent: 4533907 (1985-08-01), Thatcher
patent: 4704894 (1987-11-01), Inuzuka et al.

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