Seismic source with no reaction mass

Details Seismic source with no reaction mass Seismic source with no reaction mass

1975-11-14

1977-05-03

Birmiel, Howard A.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

181113, 181401, G01V 114

Patent

active

040209199

ABSTRACT:
An apparatus and method for generating seismic signals are described using a modulated vacuum within a chamber plus a compliant, vibration-isolating means. This compliant, vibration-isolating means provides a seal between the chamber and the earth, and also generally prevents the vibration of the chamber from being transferred to the earth. The seismic signal is transmitted directly to the earth by the changes in absolute air pressure within the chamber (the modulated vacuum). As the vibrations of the chamber are generally out of phase with the force developed by the changes in chamber pressure, the chamber vibrations must, for good efficiency, be isolated from the earth. This arrangement is lightweight and inexpensive, as there is no need for either a special mass to induce the vibrations or a special mass to hold the vibrating mass in contact with the earth's surface.

REFERENCES:
patent: 2910134 (1959-10-01), Crawford et al.
patent: 3365019 (1968-01-01), Bays
patent: 3701968 (1972-10-01), Broding

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