Communications: electrical – Selective – Interrogation response
Patent
1974-08-28
1976-09-07
Wilbur, Maynard R.
Communications: electrical
Selective
Interrogation response
250263, 328 38, 328 57, 340 18R, 340203, G01V 140, G01V 500
Patent
active
039797163
ABSTRACT:
A conventional type radiation detector in cooperation with a photomultiplier tube provides data pulses of one polarity, corresponding in peak amplitude and number to detected radiation in a borehole traversing an earth formation. Each data pulse is effectively converted to two pulses of different polarities, with one pulse starting when the other is completed and transmitted over a common well logging cable. The creation of a second pulse of an opposite polarity cancels out the low frequency component of the pulse so that they arrive at the surface as a pulse of a single polarity having a very short tail and a fast rise time. This permits more pulses to be transmitted within a given time period than heretofore existed. Surface electronics process the transmitted pulses to provide a record of the sensed condition in the borehole.
REFERENCES:
patent: 2632847 (1953-03-01), Reed, Jr.
patent: 3165584 (1965-01-01), Thornton et al.
patent: 3309657 (1967-03-01), Rabson et al.
patent: 3361978 (1968-01-01), Fiorini
patent: 3418604 (1968-12-01), Ross
Pitts, Jr. Robert W.
Whatley, Jr. Houston A.
Birmiel H. A.
Gillespie Ronald G.
Ries C. G.
Texaco Inc.
Whaley T. H.
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