Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1979-05-29
1981-06-09
Moskowitz, Nelson
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181106, 181119, 367142, G01V 1133, G01V 138
Patent
active
042719259
ABSTRACT:
A fluid pulsed generator system including an elongated tubular member of uniform elastic parameters constructed for receiving fluid flow therein and abruptly terminating said flow to create an acoustic pulse containing most of its acoustic energy in the zero to 160 Hertz frequency spectrum. The system generates a directionally distinctive acoustic pulse. The system includes a fluid reservoir adapted for supplying a suitably high fluid pressure for driving a fluid through the elongated tubular member with sufficient velocity to generate an acoustic pulse basically of the classical water hammer variety The device is provided in a marine configuration comprising an elongated acoustic radiating conduit containing the water hammer generated pressure pulse adapted for trailing from a vessel beneath the surface of a body of water. In a land based environment, the acoustic radiating conduit is encompassed within an elongated bladder having an enlarged base section and filled with the fluid to be circulated through the acoustic radiating conduit, providing a means for return utilization of the fluid and providing a desirable transfer medium between the acoustic pulse generated within the conduit and the earth's surface therebeneath. In the present invention, the entire length of the elongated tubular member itself manifests the use of the water hammer energy to generate an acoustic pulse whose frequency content lies almost entirely in the zero to 160 Hertz band. The distribution of the acoustic pulse generating water hammer wave along the elongated conduit provides a means for controlling the directionality of the radiated acoustic wave.
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Crisman Thomas L.
Moore Stanley R.
Moskowitz Nelson
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