Fiber Bragg grating array calibration

Abdeq M. Abdi, Shigeru Suzuki, Axel Schülzgen, Alan R. Kost

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations

Abstract

A three element, 15.3 cm, fiber Bragg grating array (FBGA) operating at 1550 nm wavelength is fabricated using a single mode photosensitive fiber. The FBGA is initially simulated using in-house developed software based on the Transfer Matrix Method, then fabricated using a double frequency Argon laser and a phase mask technique, and interrogated using Optical Frequency Domain Reflectometry. A single fiber Bragg grating (FBG) is accurately strain calibrated using a Fabry-Perot interferometer and piezoelectric actuation. The piezoelectric is linearly ramped, and the shifts in the Bragg wavelength along with the fringe count from the Fabry-Perot interferometer are recorded. The fringe count is then used to determine the strain on the FBG and compared to changes in the Bragg wavelength in-order to calculate the strain gage factor. This result is used to calibrate the FBGA for strain measurements. The FBGA is then bonded to a cantilever beam with three electric strain gages attached next to each FBG in the array. The axial strain results obtained from the electric strain gages and FBGA are compared for various displacements of the cantilever beam. The Fabry-Perot interferometer and piezoelectric calibration method is a non-destructive process that eliminates the need to bond the FBG to an external support during the calibration process, and can also be used to calibrate electric strain gages.

Original languageEnglish (US)
Article number58
Pages (from-to)552-563
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5765
Issue numberPART 1
DOIs
StatePublished - 2005
Externally publishedYes
EventSmart Structures and Materials 2005 - Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems - San Diego, CA, United States
Duration: Mar 7 2005Mar 10 2005

Keywords

  • Computer simulations
  • Fabry-Perot interferometer
  • Fiber Bragg Grating Array
  • Fiber optic strain calibrator
  • Optical Frequency Domain Reflectometry
  • Piezoelectric stretcher
  • Transfer matrix method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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