Combined electret hydrophone and transmission line

Details Combined electret hydrophone and transmission line Combined electret hydrophone and transmission line

1976-01-22

1977-03-08

Birmiel, Howard A.

Communications: electrical

Selective

Having indication or alarm

1741015, 340 3T, 340 155TS, 325 7, 179 15BL, G01V 138

Patent

active

040115402

ABSTRACT:
A continuous line hydrophone comprising a plurality of coaxial cable segments coupled by electronic circuit modules wherein the coaxial cable serves the functions of seismic detector, signal transmission line, and DC power supply line. In the preferred embodiment, the coaxial cable is sensitized to seismic energy by having the inter-electrode dielectric permanently polarized so that it becomes an electret. An electronic circuit module at the end of a coaxial cable segment responds to seismic frequency signals produced in the coaxial cable by acoustic waves to generate a frequency-modulated carrier wave which is coupled to the next coaxial cable segment for transmission toward a tape recorder. The electronic module also retransmits any carrier wave signals which it receives from cables from distant from the recorder. The electronic circuit means additionally allows DC power to be coupled from the recorder end of the cable to more distant electronic circuits.

REFERENCES:
patent: 3239803 (1966-03-01), Godbey
patent: 3748638 (1973-07-01), Montgomery, Jr.
patent: 3763482 (1973-10-01), Burney et al.
patent: 3831162 (1974-08-01), Armstrong
patent: 3889230 (1975-06-01), Knott
patent: 3958216 (1976-05-01), Chapman
patent: 3978446 (1976-08-01), Miller

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