期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 38, 期 4, 页码 953-960出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2019.2948214
关键词
Cavity resonators; Optical fiber sensors; Light sources; Optical fiber theory; Reflection; Cavity length interrogation; correlation algo-rithm; Fabry-Perot cavity; fiber-optic sensor
资金
- Xi'an Key Laboratory of Intelligent Detection and Perception [201805061ZD12CG45]
- National Natural Science Foundation of China [51475384]
A novel high-order harmonic-frequency cross-correlation algorithm is proposed for the cavity length interrogation of white-light fiber-optic Fabry-Perot sensors. The algorithm uses the minimum value of a high-order harmonic-frequency cross-correlation coefficient to determine the sensor cavity length by fundamental cross correlation. This eliminates ambiguity in identifying the main peak of the fundamental cross-correlation coefficient, especially when the white-light source bandwidth is insufficient. The proposed algorithm was verified through simulation and experiment using a fiber-optic FP sensor with a cavity length of 79.175 mu m. The reflection spectrum was obtained under illumination by an amplified spontaneous emission light source with a 3-dB bandwidth of 46 nm. The interrogation resolution of the algorithm was found to exceed 107.67 pm.
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