Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1988-06-28
1990-04-10
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
328151, 307351, G01V 140, H03K 5153, H03K 1700
Patent
active
049166735
ABSTRACT:
A method and apparatus for processing a signal generated by a borehole scanning system of the type in which periodic electrical firing pulses initiate a plurality of corresponding acoustic energy pulses which are transmitted from the central portion of the borehole toward the borehole wall in a plurality of radial directions and at a plurality of different depths, thereby generating reflected acoustic pulses which are detected and converted to electrical pulses. The electrical pulse is periodically sampled with each sample level being converted to a digital number. A counter initiates counting in response to the firing pulse preceding the sample electrical pulse. Upon detection of the peak of the electrical pulse, the counter count is stored. Upon detection of the electrical pulse again falling below a preselected level, the count is again stored. Then the time midway between the two stored counts is determined.
REFERENCES:
patent: 3668619 (1972-06-01), Dennis
patent: 4463378 (1984-07-01), Rambow
patent: 4740930 (1988-04-01), Broding
patent: 4777629 (1988-10-01), Morris et al.
Morris Steven A.
Mount Houston B.
Amoco Corporation
Lobo Ian J.
Tarcza Thomas H.
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