Potential of Mechanically Induced Cascaded Long-Period Grating Structure for Reflectometric Pressure, Strain, and Temperature Sensing

Avik Kumar Das, Heeyoung Lee, Kohei Noda, Yosuke Mizuno, Christopher Kin Ying Leung, Kentaro Nakamura

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We present the first report on reflectometric optical fiber sensing based on mechanically induced cascaded long-period grating (LPG) structure. This method utilizes in-house designed mechanical casings and a bare fiber. When a fiber is sandwiched between the casings and pressed by tightening screws, an LPG is induced due to a photo-elastic effect. By exploiting Fresnel refection at a fiber end, a cascaded LPG structure can be implemented using a single LPG, enabling reflectometric configuration. When this sensor is subjected to external physical processes, the attenuation bands change clearly, and their shift can be used for non-destructive evaluations. We show experimentally that this sensor can measure loads of up to 10 N without producing any permanent change in the fiber properties, indicating its pressure sensing capability. We also show that this sensor can potentially measure strain and temperature. In our experiments, the strain and temperature sensitivities are 9.4 nm/% and 0.045 nm/°C, respectively.

Original languageEnglish
Article number9089011
Pages (from-to)10539-10546
Number of pages8
JournalIEEE Sensors Journal
Volume20
Issue number18
DOIs
Publication statusPublished - 2020 Sep 15

Keywords

  • Optical fiber sensors
  • long-period gratings
  • mechanical grating induction
  • pressure
  • strain
  • temperature

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

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