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A Single Fiber Bragg Grating Sensor for the Simultaneous Measurement of Strain and Temperature

[+] Author Affiliations
Abhay K. Singh, Haiying Huang

University of Texas at Arlington, Arlington, TX

Yupeng Zhu, Ming Han

University of Nebraska-Lincoln, Lincoln, NE

Paper No. SMASIS2016-9089, pp. V001T05A012; 7 pages
doi:10.1115/SMASIS2016-9089
From:
  • ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
  • Volume 1: Multifunctional Materials; Mechanics and Behavior of Active Materials; Integrated System Design and Implementation; Structural Health Monitoring
  • Stowe, Vermont, USA, September 28–30, 2016
  • Conference Sponsors: Aerospace Division
  • ISBN: 978-0-7918-5048-0
  • Copyright © 2016 by ASME

abstract

In this paper, we have introduced the bandwidth of a Tilted Fiber Bragg Grating (TFBG) as a measurand and combine it with the central Bragg wavelength to address its cross-sensitivity with temperature and strain. We have developed a method for coating the TFBG with a thermochromic material and characterized the coated TFBG sensor under temperature and strain variations. We observed that the spectral bandwidth is sensitive only to the temperature change while the central Bragg wavelength is sensitive to both the strain and temperature. Therefore, we can measure the temperature from the TFBG bandwidth alone and measure the strain from the TFBG central wavelength after compensating for temperature induced wavelength change.

Copyright © 2016 by ASME

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