Device for generating acoustic waves by means of a falling mass

Details Device for generating acoustic waves by means of a falling mass Device for generating acoustic waves by means of a falling mass

1987-04-13

1988-09-13

Tarcza, Thomas H.

Acoustics

Geophysical or subsurface exploration

Well logging

181121, 367911, G01V 140

Patent

active

047702680

ABSTRACT:
A device is provided for generating acoustic waves by means of a falling mass striking a target element integral with rectractable anchorage means. The mass moves in an elongate body under the combined action of gravity and resilient means from a raised position to an impact position. Resetting, after the fall, is provided by raising the mass by means of a nut, held against rotation, using a threaded rod connected to reversible drive means and locking it in the high position either by means of a retractable bar tripped by the return of the nut to the low position or else by remote controlled magnetic means. The anchorage means include for example a "packer" and a resilient coupling means.

REFERENCES:
patent: 4648478 (1987-03-01), Dedole et al.

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