Apparatus for generating elliptically polarized shear waves

Details Apparatus for generating elliptically polarized shear waves Apparatus for generating elliptically polarized shear waves

1989-07-20

1990-09-25

Steinberger, Brian S.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Vibrator-type transmitter

181114, 181121, 181119, 181401, G01V 100

Patent

active

049598180

ABSTRACT:
Apparatus for generating a controlled parameter elliptically polarized shear wave into an earth medium. The apparatus consists of a baseplate for engagement with the earth medium in omni-directionally resistant manner and a reaction mass and actuator assembly affixed thereto and energizable to impart reciprocal lateral forces to the baseplate that exert a predetermined resultant force at a controlled rate of rotation.

REFERENCES:
patent: 3034594 (1962-05-01), Menzel et al.
patent: 3280935 (1966-10-01), Brown
patent: 4631964 (1986-12-01), Sprunt et al.
patent: 4705137 (1987-11-01), Fair
patent: 4853906 (1989-08-01), Cole

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