Digital induction logging system including autocalibration

Details Digital induction logging system including autocalibration Digital induction logging system including autocalibration

1981-06-08

1984-03-27

Wise, Edward J.

Boots, shoes, and leggings

364573, 364571, 324339, G06F 1520

Patent

active

044398310

ABSTRACT:
A method and apparatus for autocalibrating the transfer function of a digital induction logging tool is disclosed. A plurality of test calibration signals of differing amplitudes are generated and periodically substituted for the normal formation signals. An expression for the transfer function of the tool using standard circuit analysis is obtained for the tool. From the tool output measurements taken for the various test calibration inputs, a linearization correction function is obtained for the tool transfer function as the tool is being used in normal logging operations.

REFERENCES:
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patent: 3056917 (1962-10-01), Tanguy
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patent: 3179879 (1965-04-01), Tanguy
patent: 3340464 (1967-09-01), Gouilloud
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patent: 4355310 (1982-10-01), Belaigues et al.
patent: 4369497 (1983-01-01), Poupon et al.
Borehole Measurements of Conductivity and Dielectric Constant in the 300 kHz to 25 MHz Frequency Range; R. N. Grubb et al, Radio Science, vol. 11, No. 4, pp. 275-283, Apr. 1976.

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