Active noise cancellation through the use of magnetic coupling

Details Active noise cancellation through the use of magnetic coupling Active noise cancellation through the use of magnetic coupling

2006-05-31

2009-12-29

Bolda, Eric (Department: 3663)

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

Reexamination Certificate

active

07639562

ABSTRACT:
Passive and active suppression of casing signals is used to improve the ability to measure formation velocities. Passive suppression includes the use of a magnet slidably coupled to the casing. Active suppression uses measurement of casing signals to control the output of an electromechanical acoustic transducer which cancels the propagating signal. Feedback control may be provided.

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