Fiber-optic acoustic emission sensor based on a chirped FBG pair for crack detection in aluminum plate

Guigen Liu, Lingling Hu, Yupeng Zhu, Ming Han

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

Abstract

In this paper, a fiber-optic acoustic emission (AE) sensor system for the detection of AE signals generated from cracks within an aluminum plate is described. The sensor head consists of a pair of tandem chirped fiber Bragg gratings (CFBGs) that form a Fabry-Perot type interferometer (FPI). This CFBG-FPI features a series of resonant wavelength notches in the reflection spectrum, which are subject to the same wavelength shift as the sensor is stretched or compressed by AE signals. By locking a tunable laser to the slope of any individual notch, the AE induced high-frequency wavelength shift is converted into intensity variation. Using the sensor system, AE signals generated by three different types of sources, i.e., PZT actuator, pencil break, and cracks within aluminum plates, are detected and compared. Our experimental results suggest that cracks in the aluminum plates gave birth to broadband AE with peak intensity spanning over 100 kHz to 350 kHz.

Original languageEnglish (US)
Title of host publicationStructural Health Monitoring 2017
Subtitle of host publicationReal-Time Material State Awareness and Data-Driven Safety Assurance - Proceedings of the 11th International Workshop on Structural Health Monitoring, IWSHM 2017
EditorsFu-Kuo Chang, Fotis Kopsaftopoulos
PublisherDEStech Publications
Pages1192-1197
Number of pages6
ISBN (Electronic)9781605953304
DOIs
StatePublished - 2017
Event11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017 - Stanford, United States
Duration: Sep 12 2017Sep 14 2017

Publication series

NameStructural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance - Proceedings of the 11th International Workshop on Structural Health Monitoring, IWSHM 2017
Volume1

Other

Other11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017
CountryUnited States
CityStanford
Period9/12/179/14/17

ASJC Scopus subject areas

  • Health Information Management
  • Computer Science Applications

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