Method and apparatus for acoustic well logging of earth borehole

Details Method and apparatus for acoustic well logging of earth borehole Method and apparatus for acoustic well logging of earth borehole

1977-11-02

1979-02-20

Moskowitz, Nelson

Communications: electrical

Selective

Having electron beam device

340 155BH, 340 155SW, 340 155GC, 181103, G01V 140

Patent

active

041409949

ABSTRACT:
In order to prevent late arriving and higher amplitude shear waves from saturating the subsurface amplifier, the amplitude of each succeeding positive half cycle of the earlier arriving compressional wave is measured and a negative feedback is supplied to the amplifier if the measured amplitude exceeds 50% of full scale. Circuitry is provided for utilization of a two transmitter, two receiver system using the same type of negative feedback to control the gain of the subsurface amplifier.

REFERENCES:
patent: 2817715 (1957-12-01), Blake
patent: 3252131 (1966-05-01), Vogel
patent: 3289157 (1966-11-01), Brokaw
patent: 3322229 (1967-05-01), Smith
patent: 3376557 (1968-04-01), Godinez
patent: 3467875 (1969-09-01), Angle
patent: 3621410 (1971-11-01), Badger et al.
patent: 3828262 (1974-08-01), Trocqueme
patent: 4042907 (1977-08-01), Troviller et al.

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