Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1990-02-22
1991-03-12
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 67, 367 69, 367 98, G01V 140
Patent
active
049998170
ABSTRACT:
A rotary ultrasonic transducer logging tool is set forth which has a transmitter connected to a transducer for transmitting pulses periodically, and a rotor with angle sensor connected thereto. One full revolution is divided into a specified number of incremental steps. The output of the receiver is supplied to an automatic gain control amplifier, then to an analog to digital converter. A gain control setting for the AGC amp is included. The AGC setting for the particular corresponding points in a first revolution of the transducer are used to provide settings for the AGC amplifier in the next revolution. A first buffer is used to store the data for the first revolution, a second buffer for the second revolution, and alternately back to the first buffer. These two buffers provide an output signal for a gain control buffer then input to the AGC amplifier. Alternate forms of gain control signal selection are used such as prior gain control settings.
REFERENCES:
patent: 3621410 (1971-11-01), Badger et al.
patent: 4691307 (1987-09-01), Rambow
patent: 4727521 (1988-02-01), Meyer et al.
patent: 4855965 (1989-08-01), Rambow
Beard William J.
Halliburton Logging Services Inc.
Lobo Ian J.
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