Simultaneous position and displacement sensing using two fibre Bragg grating sensors

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

Over the years, many shape sensing methods have been developed with technologies including optical fibre, PZT and fringe projection. Among them, optical fibres have gained a lot of attention due to their unobtrusive nature when either surface mounted or embedded in the structure. Optical fibre Bragg gratings (FBG) are currently employed for structural health monitoring in civil and aerospace systems and their shape sensing capabilities have been previously reported. In this paper, we propose a novel fibre optic based shape sensor of an isotropic cantilever beam based on the principles of interferometry and FBG sensing. The method described in this paper uses a standard single core single-mode optical fibre and the least number of sensors to estimate the shape, making it comparatively an inexpensive sensing method. On displacing the beam with an unknown magnitude and at an unknown location along the beam, we are able to demonstrate that we can measure the shape of the displaced beam and the magnitude and location of the force applied. The analysis involves using a calibration method and an iterative calculation to measure the two unknowns. An analytical model based on the known beam theories was used to assess the accuracy of the measurements. The preliminary analysis yielded an accuracy of ±1 mm and ±50 mm for the displacement and location, respectively.

Original languageEnglish
Title of host publicationSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019
EditorsJerome P. Lynch, Hoon Sohn, Kon-Well Wang, Haiying Huang
PublisherSPIE
Volume10970
ISBN (Electronic)9781510625952
DOIs
Publication statusPublished - 2019
EventSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019 - Denver, United States
Duration: 4 Mar 20197 Mar 2019

Publication series

NameSENSORS AND SMART STRUCTURES TECHNOLOGIES FOR CIVIL, MECHANICAL, AND AEROSPACE SYSTEMS 2019
ISSN (Print)0277-786X

Conference

ConferenceSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2019
CountryUnited States
CityDenver
Period4/03/197/03/19

Keywords

  • Fibre Bragg grating
  • Optical interferometry
  • Shape sensing
  • Strain measurement
  • Structural health monitoring

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