发明授权
US07911877B2 Active noise cancellation through the use of magnetic coupling 失效
通过使用磁耦合来主动消除噪声

Active noise cancellation through the use of magnetic coupling
摘要:
Passive 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.
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