Simultaneous measurement of axial strain and lateral stress based on cascaded interference structure

Yujian Li, Zhengyong Liu, Yifan Liu, Changyuan Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

To solve the cross-sensitivity problem in the dual-parameter optical fiber system, a new type of sensor based on cascaded interference structure is proposed without cross-sensitivity. The design consists of a Michelson interferometer and a Sagnac interferometer based on a high-birefringence suspended core fiber segment. After calculating by the analogous Fast Fourier Transformation (FFT) and filtering by FFT filter, the spectrum of the sensor responds linearly to the change of axial strain and lateral stress. The sensitivity to lateral stress is 3.13 nm/(kPa) in the range from 0 to 1200 Pa and the axial strain is 1.846e-4 (nm μϵ)-1 from 0 to 4000 μϵ. The capability of the proposed sensor for dual-parameter sensing is also experimentally demonstrated. The precision rate for dual-parameter sensing is as high as 66.7%, reflecting the sensor's usability for simultaneous measurement of axial strain and lateral stress.

Original languageEnglish
Pages (from-to)10942-10952
Number of pages11
JournalOptics Express
Volume30
Issue number7
DOIs
Publication statusPublished - 28 Mar 2022

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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