Sign bit optical-electrical geophone

Details Sign bit optical-electrical geophone Sign bit optical-electrical geophone

1983-12-09

1987-09-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73653, G01D 534

Patent

active

046941622

ABSTRACT:
An optical-electrical geophone which generates a binary signal is described. The geophone utilizes an optical fiber for the return transmission of a light source in the geophone. The geophone contains a light chopping means which oscillates in response to vibrations imparted into a geologic formation. As the chopping means such as a baffle or a tubular member vibrates, it chops the light signal and creates an on/off light pattern, i.e., binary signal. The light passing through a slit in the baffle or tubular member is returned to the seismic vehicle through an optical fiber for further processing. The optical-electrical geophone creates a binary signal directly without the use of clipping electronics and magnets or coils used in conventional geophones.

REFERENCES:
patent: 3851167 (1974-11-01), Levine
patent: 4321464 (1982-03-01), Miller
patent: 4353259 (1982-10-01), Schneider
patent: 4359637 (1982-11-01), Perren
patent: 4376390 (1983-03-01), Rines
patent: 4403144 (1983-09-01), Strahan et al.
patent: 4517456 (1985-05-01), Halsall et al.

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