Four-wavelength laser interferometry for the demodulation of dual-cavity fiber-optic extrinsic Fabry-Perot interferometric sensors

Yang Han, Yi Jiang*, Jingshan Jia, Yutong Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A four-wavelength passive demodulation algorithm is proposed and experimentally demonstrated for the interrogation of the one cavity in a dual-cavity extrinsic Fabry-Perot interferometric (EFPI) sensor. The lengths of two cavities are adjusted to generate four quadrature signals for each individual cavity. Both simulation and experimental results are presented to validate the performance of this technique. The experimental results demonstrate that dynamic signals at frequencies of 100 Hz, 200 Hz, and 300 Hz with varying amplitude are successfully extracted from a dual-cavity EFPI sensor with initial lengths of 93.4803 µm and 94.0091 µm. The technique shows the potential application to measure dynamic signals in dual-cavity fiber-optic EFPI sensors.

Original languageEnglish
Pages (from-to)14200-14210
Number of pages11
JournalOptics Express
Volume32
Issue number8
DOIs
Publication statusPublished - 8 Apr 2024

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