Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1982-05-24
1985-08-20
Cangialosi, Sal
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367155, 367160, 367163, 367173, 310331, 310337, G01V 138, H04R 1700
Patent
active
045368627
ABSTRACT:
A seismic cable assembly having an acoustically transparent tubular enclosure has at least one hydrophone electrically connected and positioned within the cable assembly enclosure. The hydrophone is made up of a pair of formed, electrically conductive plates that fit against an insulating seal which also forms a fluid seal, providing a sealed chamber defined by the inside surfaces of the conductive plates. A pair of piezoelectric elements are interconnected and positioned within the sealed chamber, one element mechanically and electrically connected to the inside surface of one of the conductive plates and the other piezoelectric element mechanically and electrically connected to the inside surface of the other conductive plate. When pressure is applied to the conductive plates, they deform, causing the piezoelectric elements to flex. When the elements flex, an electrical output is presented on the conductive plates which serve as terminals. Depending upon the polarity relationship of the elements, the output is that of an acceleration-cancelling hydrophone, or that of an accelerometer.
REFERENCES:
patent: 2762032 (1956-09-01), Vogel
patent: 3749948 (1973-07-01), Morris
patent: 3947644 (1976-03-01), Uchikawa
patent: 3970878 (1976-07-01), Berglund
patent: 4370583 (1983-01-01), Ljung
Lo Charng-Wen M.
Sullivan Lawrence B.
Cangialosi Sal
Devine Thomas G.
Heiting Leo N.
Kaiser K.
Sharp Melvin
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