Loss compensation for distributed sensing in downhole environments
US9488531B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2013 |
| Grant date | Nov 8, 2016 |
| Priority date | — |
| Expiry date | Feb 16, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/44382
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for estimating a parameter includes: an optical fiber sensor including at least one optical fiber configured to be disposed in a downhole location and including at least one sensing location configured to generate measurement signals; at least one light source configured to transmit a measurement signal having a wavelength to interrogate a sensing location and cause the sensing location to return a reflected measurement signal indicative of a measured parameter, and configured to transmit a reference signal and cause a reflected reference signal to be returned from a location associated with the sensing location, the reflected reference signal having a known relationship to hydrogen concentration; and a processor configured to receive the reflected measurement signal and the reflected reference signal, estimate the hydrogen concentration based on the reflected reference signal, and calibrate the first reflected signal based on the estimated hydrogen concentration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.