Symmetrical demodulation method for the phase recovery of extrinsic Fabry-Perot interferometric sensors

Jingshan Jia, Yi Jiang, Junbin Huang, Jie Hu, Lan Jiang

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

A symmetrical demodulation method is developed for the recovery of dynamic signals. Extrinsic Fabry-Perot interferometers (EFPIs) with different cavity lengths can be interrogated by a same demodulator. In the demodulation technique, three interferometric signals are introduced by selecting three specified laser wavelength, two of the three signals are symmetrical about the third signal. The dynamic signal is recovered by the proposed method from the three interferometric signals. EFPI sensors in a wide cavity length range (>1000 µm) can be demodulated without dead zone. The calculated amplitude error of the demodulated signal is less than 0.25% with the cavity length in the 20-1005 µm range. The proposed demodulation technique is adapted to the measurement of EFPIs with unsteady cavity lengths and unknown cavity lengths.

Original languageEnglish
Pages (from-to)9149-9157
Number of pages9
JournalOptics Express
Volume28
Issue number7
DOIs
Publication statusPublished - 30 Mar 2020

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