Simultaneous load and temperature measurement using Lophine-coated fiber Bragg gratings

A. K. Singh, Y. Zhu, M. Han, H. Huang

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


This paper presents a single fiber Bragg grating (FBG) sensor that is capable of measuring the axial load and temperature simultaneously. The FBG sensor is coated with a block of recrystallized Lophine, which introduces the bandwidth modulation of the FBG reflectance spectrum. Thermal-mechanical testing of the Lophine-coated FBG sensor under different load and temperature combinations was carried out. It was discovered that the FBG bandwidth is linearly proportional to the applied load and temperature. By fitting the measured FBG bandwidths and central Bragg wavelengths as linear functions of the axial load and temperature, we demonstrated that the axial load and temperature can be inversely determined from the measured reflectance spectrum of a single Lophine-coated FBG sensor. The measurement errors for the axial load and the temperature were found to be ±4 gm and ±4 °C, respectively.

Original languageEnglish (US)
Article number115019
JournalSmart Materials and Structures
Issue number11
StatePublished - Oct 18 2016


  • Bragg wavelength
  • Lophin
  • fiber Bragg grating (FBG)
  • optical fiber sensor
  • spectrum bandwidth
  • strain sensor
  • temperature sensor

ASJC Scopus subject areas

  • Signal Processing
  • Civil and Structural Engineering
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering


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