Method and apparatus for determining angle of inclination of sei

Details Method and apparatus for determining angle of inclination of sei Method and apparatus for determining angle of inclination of sei

1980-06-19

1984-07-24

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

367173, 181401, 33308, 33 1E, G01V 138

Patent

active

044620942

ABSTRACT:
A geophone is hung from a ball bearing in a pendular fashion so that it is free to swing in any direction. Because it is weighted, it will assume the correct positioning for operation. A clamp, carried with the pendular geophone in a seismometer designed for use on the ocean floor, fixes the geophone in a rigid position when a solenoid is actuated. After the seismometer is deployed on the sea bottom, it is desired to clamp the geophone into its assumed position. The solenoid is fired upon command causing the ball to be clamped. When the seismometer is recovered the angle of inclination with respect to the vertical it assumed at the time when the geophone was clamped can be determined by measuring the angle formed by the clamped geophone and a surface known to be vertical when the seismometer rests on a flat, horizontal surface.

REFERENCES:
patent: 1738589 (1929-12-01), Koppl
patent: 2551417 (1952-05-01), Carlisle
patent: 2615248 (1952-10-01), Hildebrandt
patent: 3731264 (1973-05-01), Campbell et al.
patent: 3818425 (1974-06-01), Brynand et al.
patent: 4292861 (1981-10-01), Thornhill et al.
patent: 4300254 (1981-11-01), Prior
Francis et al., "Experience . . . Ocean Bottom Seismograph", pp. 143-150, Marine Geophysical Researches, 3, 1977.
Francis et al., "Ocean Bottom Seismograph", 1975, pp. 195-213, Marine Geophysical Researches, 2.
Prothero, "An . . . Ocean Bottom Seismometer Capsule", U. of Calif., Project USDC R/E-15.

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