Ultrasonic logging apparatus with improved receiver

Details Ultrasonic logging apparatus with improved receiver Ultrasonic logging apparatus with improved receiver

1989-06-09

1990-04-10

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 25, 367911, 181105, G01V 100

Patent

active

049166484

ABSTRACT:
An ultrasonic logging apparatus is provided with a receiver for receiving acoustic returns of varying amplitudes and a digitizer for digitizing the acoustic returns. The receiver utilizes the same transducer as the transmitter, and has input switching protection to protect the amplifiers from the transmitter signal. The receiver amplifiers have gain switching, utilizing junction field-effect transistors to produce rapid gain switching during an acoustic return. The gain switching allows the digitizer to digitize with satisfactory resolution.

REFERENCES:
patent: 3553640 (1971-01-01), Zemanek
patent: 4254481 (1981-03-01), Smither et al.
patent: 4691307 (1987-09-01), Rambow
patent: 4837753 (1989-06-01), Morris et al.

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