Vibratory ground-survey system

Details Vibratory ground-survey system Vibratory ground-survey system

1996-08-30

1998-07-28

Oda, Christine K.

Measuring and testing

Vibration

Vibrator

181121, G01P 1502

Patent

active

057865370

ABSTRACT:
A rotary vibrating system is used in surveys of the acoustic properties of the shallow earth. The vibrator itself is of eccentric-mass (or "swinging-weight") form. Coupled to a flywheel, it decelerates freely from a selected high frequency to a selected low frequency. The observed deceleration rate is manipulated to give a measure of the acoustic properties of the near-surface. The eccentricity of the vibrator is then annulled, and the flywheel and vibrator accelerated back to the selected high frequency for another measurement at another location. A display in map form is provided to facilitate visual interpretation of the results.

REFERENCES:
patent: 3999626 (1976-12-01), Adams
patent: 4026383 (1977-05-01), Bedenbender
patent: 4706231 (1987-11-01), Mueller
patent: 4749057 (1988-06-01), Anstey
patent: 5079463 (1992-01-01), Matsuyama
patent: 5154254 (1992-10-01), Thompson
patent: 5327399 (1994-07-01), Ansada

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