Method of gain regulation for downhole spectroscopy tools without using a calibration source
US5360975A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1993 |
| Grant date | Nov 1, 1994 |
| Priority date | — |
| Expiry date | Apr 23, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.