Laser geophone

Details Laser geophone Laser geophone

1979-11-14

1981-08-18

Buczinski, S. C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

73657, 356 45, 356356, G01P 336, G01B 1102, G01B 902

Patent

active

042843502

ABSTRACT:
A method for measuring the velocity of earth surface motion utilizing coherent light energy which comprises steps of generating and directing a coherent light beam toward a selected earth surface position, reflecting said beam from a stationary reflector located at the earth surface position, and simultaneously reflecting said beam from a reflector at said earth surface position which moves with earth surface motion; and, detecting the reflected beam, including both the reflection path components, to derive an instantaneous difference frequency that is proportional to the velocity of the earth surface motion.

REFERENCES:
patent: 3373401 (1968-03-01), Bayer
patent: 3523735 (1970-08-01), Taylor
patent: 3601491 (1971-08-01), Vaniz
patent: 3863064 (1975-01-01), Doyle et al.
patent: 4026655 (1977-05-01), Gunter, Jr.
patent: 4185503 (1980-01-01), Saito

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