In situ calibration of a sensor

Details In situ calibration of a sensor In situ calibration of a sensor

1990-03-16

1990-11-13

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Testing, monitoring, or calibrating

367 35, 181105, G01V 100, H04B 1700

Patent

active

049706950

ABSTRACT:
Logging equipment for use in a borehole has a sensor such as an ultrasonic sensor, oriented radially towards the wall of the borehole and rotatable in one direction during measurement about the longitudinal axis of the equipment. In order to allow the sensor to be recalibrated downhole, the equipment also includes a target which is automatically brought face to face with the sensor upon reversal of the direction of rotation of the sensor. The sensor can thus be calibrated under conditions which are as close as possible to the conditions of measurement.

REFERENCES:
patent: 2631270 (1953-03-01), Goble
patent: 4524433 (1985-06-01), Broding
patent: 4685092 (1987-08-01), Dumont

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