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Fundamental and high-order cross-correlation combined demodulation method for absolute cavity length measurement of fiber-optic Fabry–Perot sensors.
- Source :
-
Optical Engineering . Sep2022, Vol. 61 Issue 9, p96102-96102. 1p. - Publication Year :
- 2022
-
Abstract
- For the accurate cavity-length demodulation of fiber-optic Fabry–Perot (FP) sensors, a combined correlation method based on the fundamental cross-correlation and a higher-order one is proposed, simulated, and experimentally verified. By extending the reflection spectrum eightfold through continuous frequency-doubling three times, cross-correlation using both the original and eightfold spectra, and determination of the main peak of the fundamental cross-correlation coefficient function with the assistance of the eighth-order cross-correlation coefficient, the cavity-length demodulation resolution for fiber-optic FP sensors can be significantly improved even when the spectral bandwidth of the source is limited or the cavity length is relatively short. A cavity length resolution better than 1.8 nm is achieved for an FP sensor with a cavity length of ∼162 μm. The proposed demodulation method can effectively reduce the bandwidth requirement of the light source for the cavity-length extraction of fiber-optic FP sensors, particularly those with relatively short cavity lengths. [ABSTRACT FROM AUTHOR]
- Subjects :
- *DEMODULATION
*LENGTH measurement
*DETECTORS
*LIGHT sources
*OPTICAL fiber detectors
Subjects
Details
- Language :
- English
- ISSN :
- 00913286
- Volume :
- 61
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Optical Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 159437690
- Full Text :
- https://doi.org/10.1117/1.OE.61.9.096102