Method of gain regulation for downhole spectroscopy tools withou

Details Method of gain regulation for downhole spectroscopy tools withou Method of gain regulation for downhole spectroscopy tools withou

1993-04-23

1994-11-01

Hannaher, Constantine

Radiant energy

Geological testing or irradiation

Well testing apparatus and methods

250261, 250369, G01U 504, G01U 506, G01U 510

Patent

active

053609751

ABSTRACT:
The present invention provides a method of stabilizing the gain of spectroscopy equipment using the actual measured spectrum of the formation of interest and thereby eliminating the need to use external radioactive calibration sources. The gain is measured and adjusted using spectral fitting techniques. In these techniques, an energy spectrum of the radiation from an earth formation is measured. The measured spectrum is compared to a standard spectrum or composite spectrum. As a result of the comparisons, deviations between corresponding features of the two spectra are determined. Gain correction signals are calculated based on the determined deviations. The gain of the spectroscopy equipment is adjusted based on these calculated correction signals.

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