Hydrostatic pressure sensor based on a gold-coated thin-core fiber modal interferometer and ripple shift measurement

Daru Chen, Xin Cheng, Hwa Yaw Tam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

We propose a hydrostatic pressure sensor based on a gold-coated thin-core fiber modal interferometer (TCFMI). A thin-core fiber is spliced to a single mode fiber forming a single-end fiber modal interferometer (FMI) due to the core mismatch and the fiber end reflection. Relative reflection spectra of TCFMIs based on thin-core fibers with different lengths are investigated. The TCFMI is gold-coated to enhance the optical reflectivity, which also results in the ripple of the relative reflection spectra of TCFMI. A high hydrostatic pressure sensor test system is proposed and the performance of the pressure sensor has been experimentally investigated. A pure-ripple-shift measurement method is used to achieve the demodulation of the sensor. The proposed pressure sensor has a sensing range up to 40 MPa and a sensitivity of 44.8 pm/MPa.
Original languageEnglish
Pages (from-to)3471-3474
Number of pages4
JournalOptics Communications
Volume285
Issue number16
DOIs
Publication statusPublished - 15 Jul 2012

Keywords

  • Fiber modal interferometer
  • Gold coating
  • Hydrostatic pressure sensor
  • Thin-core fiber

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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