Target plate for impulse-type acoustic signal generator

Details Target plate for impulse-type acoustic signal generator Target plate for impulse-type acoustic signal generator

1984-09-12

1988-05-17

Moskowitz, Nelson

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

181401, G01V 104

Patent

active

047444398

ABSTRACT:
A rigid, earth-contacting target for use with an acoustic signal generator is designed to be impacted by a mass propelled downwardly by compressed air or other energy source. The target includes an upper impact-receiving member slidably interfitted with a lower ground-contacting member. An elastomeric disc is confined between the upper and lower members so as to experience three-dimensional compression in response to such impact. The bulk modulus of the elastomer determines the degree to which the rate of acceleration of the lower member is reduced as compared to that of the upper member, and thus in turn, controls the frequency content of the resultant acoustic pulse.

REFERENCES:
patent: Re27418 (1972-07-01), Mayne
patent: 3416363 (1968-12-01), Siems
patent: 3817091 (1974-06-01), Frederick
patent: 4608675 (1986-08-01), Chelminshi

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