Apparatus for inducing elliptically polarized shear waves in an

Details Apparatus for inducing elliptically polarized shear waves in an Apparatus for inducing elliptically polarized shear waves in an

1988-05-31

1990-05-01

Steinberger, Brian S.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Vibrator-type transmitter

181114, 367 75, G01V 109

Patent

active

049224727

ABSTRACT:
The present invention relates to a method for generation of elliptically polarized shear waves in an earth medium using two shear wave vibrators engaged to the earth medium in cross-polarized attitude and driven at sweep rates having variable phase displacement.

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S. Hayashi, "A New Dynamic Control 4-Moment Vibration Generator", Meiden Rev (Inted), Japan, Ser. No. 63, No. 3, 1981, pp. 32-36.

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