Highly-sensitive π-phase-shifted Fiber-Bragg-grating ultrasonic sensors for structural health monitoring

Thomas Fink, Qi Zhang, Fawen Guo, Wayne Arhens, Ming Han

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

We present a highly sensitive fiber-optic ultrasonic sensor based on π-phase-shifted Fiber Bragg gratings (πFBG) for structural health monitoring. Due to the phase discontinuity at the center of the grating, the reflection spectrum of a πFBG features a narrow notch, leading to significantly improved sensitivity over traditional fiber-Bragg-grating based ultrasonic sensors. The πFBG sensor interrogation is based on a wavelength-tunable, narrow-linewidth diode laser whose wavelength is locked to center of the linear slope of the spectral notch. Two different fabrication methods of πFBG are developed. Highly sensitive detection of ultrasonic waves on an aluminum plate using a πFBG sensor is demonstrated and its performance is compared to a PZT sensor system. The directivity of a πFBG sensor is also characterized. The noise performance of the πFBG sensor system is theoretically analyzed.

Original languageEnglish (US)
Title of host publicationSAMPE 2012 Conference and Exhibition
StatePublished - Jul 23 2012
Event2012 SAMPE International Symposium and Exhibition - Emerging Opportunities: Materials and Process Solutions - Baltimore, MD, United States
Duration: May 21 2012May 24 2012

Publication series

NameInternational SAMPE Technical Conference

Conference

Conference2012 SAMPE International Symposium and Exhibition - Emerging Opportunities: Materials and Process Solutions
CountryUnited States
CityBaltimore, MD
Period5/21/125/24/12

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ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Fink, T., Zhang, Q., Guo, F., Arhens, W., & Han, M. (2012). Highly-sensitive π-phase-shifted Fiber-Bragg-grating ultrasonic sensors for structural health monitoring. In SAMPE 2012 Conference and Exhibition (International SAMPE Technical Conference).