发明名称 |
Apparatus and method for the suppression of microphonic noise in proportional counters for borehole logging-while-drilling |
摘要 |
A method and apparatus is disclosed for suppressing microphonic noise in proportional counter neutron detection in borehole logging-while-drilling measurements. Noise is reduced by (1) applying the outputs of two detectors respectively to positive and negative inputs of a differential amplifier; (2) generating output pulses by applying the output of the differential amplifier to positive and negative comparators to produce first and second output pulses; (3) counting output pulses as neutron counts only if the first or second output pulses have time lengths less than a predetermined time length; and (4) rejecting the output pulses in the count of pulses as neutron counts if first and second output pulses coincide in time.
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申请公布号 |
US5635711(A) |
申请公布日期 |
1997.06.03 |
申请号 |
US19960637567 |
申请日期 |
1996.04.25 |
申请人 |
SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
SLOAN, W. ROBERT;HOLENKA, JACQUES M.;KURKOSKI, PHILIP L. |
分类号 |
G01T1/185;G01T3/00;G01V5/04;(IPC1-7):G01T3/00 |
主分类号 |
G01T1/185 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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