AGC circuit for televiewer

Details AGC circuit for televiewer AGC circuit for televiewer

1985-09-23

1987-09-01

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

330281, 330284, 367 65, G01V 140

Patent

active

046913076

ABSTRACT:
A borehole televiewer circuit for compensating for out-of-roundness of a borehole. The circuit comprises an automatic gain control circuit having time constants that allow detection of borehole anomalies while having a fast enough rise time to adjust for the effects of out-of-roundness.

REFERENCES:
patent: 3406780 (1968-10-01), Zemanek, Jr.
patent: 3478839 (1969-11-01), Zemanek, Jr.
patent: 3553640 (1971-01-01), Zemanek, Jr.
patent: 3775749 (1973-11-01), Tegholm
patent: 3790896 (1974-02-01), Shimizu et al.
patent: 3904975 (1975-09-01), Satoh
patent: 4134079 (1979-01-01), Kohtani
Heard et al., "Development of a Geothermal Acoustic Borehole Televiewer," Sandia National Lab., DOE Contract DE-AC04-76DP00789, 8/83.
Georgi, D. T., "Geometrical Aspects of Borehole Televiewer Images," SPWLA 26th Annual Logging Symposium, 6/17/85, 19 pages.
Rambow, F. H. K., "The Borehole Televiewer: Some Field Examples," Shell Development Corp., 21 pages, SPWLA 25th Annual Logging Symposium, 6/10/84, Louisiana.

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