Method for maintaining a constant tension on a seismic marine ca

Details Method for maintaining a constant tension on a seismic marine ca Method for maintaining a constant tension on a seismic marine ca

1983-04-18

1986-04-08

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Offshore prospecting

367130, 367 15, 254274, G01V 138

Patent

active

045817235

ABSTRACT:
A method for maintaining a substantially constant tension on a towed seismic cable, wherein the instantaneous towing force and the instantaneous cable displacement relative to a fixed shipboard reference are continously measured and sampled. A microprocessor associated with a servo controlled capstan device, uses those measurements to pay out cable or to retrieve cable in response to an increase or decrease in the instantaneous towing force. The microprocessor also tries to minimize the average cable displacement.

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patent: 3181644 (1965-05-01), Roever
patent: 3265359 (1966-08-01), Bowden
patent: 3276746 (1966-10-01), Berne
patent: 3279761 (1966-10-01), Schreiber
patent: 3343810 (1967-09-01), Parnell
patent: 4196888 (1980-04-01), Tande et al.
patent: 4200052 (1980-04-01), Cunningham et al.
patent: 4314363 (1982-02-01), Thigpen et al.
patent: 4323222 (1982-04-01), Dempster et al.

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