Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1990-06-08
1991-10-08
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250256, 250261, 250264, 364422, G01V 504, G01V 508
Patent
active
050556754
ABSTRACT:
A pulse height analyzer for spectrocopy thermal multigate decay well logging systems is disclosed and has an input section comprising a peak time determining circuit locating a peak occurrence. The peak is determined relative to a threshold voltage determining circuit. On peak detection, a timing signal is formed for a control circuit. This operates a sample and hold switch at the output of an amplifier for the input. This switch inputs to an A/D converter driving a buffer. Various handshake signals cooperate with a telemetry system to transfer the peak time A/D valve for pulse height measurement.
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patent: 4707741 (1987-11-01), Stratton
patent: 4788424 (1988-11-01), Preeg
Beard William J.
Eisenberg Jacob M.
Halliburton Logging Services Inc.
Hannaher Constantine
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