System and method for determination of the reflection wavelength of multiple low-reflectivity bragg gratings in a sensing optical fiber
US7538860B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 17, 2007 |
| Grant date | May 26, 2009 |
| Priority date | — |
| Expiry date | Dec 31, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/7703
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system and method for determining a reflection wavelength of multiple Bragg gratings in a sensing optical fiber comprise: (1) a source laser; (2) an optical detector configured to detect a reflected signal from the sensing optical fiber; (3) a plurality of frequency generators configured to generate a signal having a frequency corresponding to an interferometer frequency of a different one of the plurality of Bragg gratings; (4) a plurality of demodulation elements, each demodulation element configured to combine the signal produced by a different one of the plurality of frequency generators with the detected signal from the sensing optical fiber; (5) a plurality of peak detectors, each peak detector configured to detect a peak of the combined signal from a different one of the demodulation elements; and (6) a laser wavenumber detection element configured to determine a wavenumber of the laser when any of the peak detectors detects a peak.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.