Radiant energy – Geological testing or irradiation – With drill or drilling
Patent
1996-04-25
1997-06-03
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
With drill or drilling
250262, 25039001, G01T 300, G01T 1185
Patent
active
056357117
ABSTRACT:
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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Holenka Jacques M.
Kurkoski Philip L.
Sloan W. Robert
Bush Gary L.
Hannaher Constantine
Kanak Wayne I.
Schlumberger Technology Corporation
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