Fiber Bragg gratings and two wave mixing spectral demodulator system for impact detection and localization

G. Kirikera*, O. Balogun, S. Krishnaswamy

*Corresponding author for this work

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

1 Scopus citations

Abstract

Multiplexed fiber Bragg grating (FBG) sensors capable of dynamically measuring high frequency (>200KHz) ultrasonic waves using a two wave mixing spectral demodulator has been reported by us previously. The two-wave mixing spectral demodulator enables multiplexing of several FBG sensors and also acts as a high pass filter eliminating low frequency thermal drift and vibrational noise without the need for stabilization as required by other interferometric demodulation schemes. We have demonstrated that this system is capable of monitoring and locating of impact events if several FBG sensors are used. In this paper, we present recent results that have extended our original architecture to take into account the directional dependence of FBG sensor sensitivity to propagating ultrasonic waves. Since the FBG is highly directionally dependent at high frequencies, a simple rosette FBG pattern is implemented enabling effective detection of impact from any location.

Original languageEnglish (US)
Title of host publicationProceedings of the 4th European Workshop on Structural Health Monitoring
Pages840-846
Number of pages7
StatePublished - Dec 1 2008
Event4th European Workshop on Structural Health Monitoring - Cracow, Poland
Duration: Jul 2 2008Jul 4 2008

Publication series

NameProceedings of the 4th European Workshop on Structural Health Monitoring

Other

Other4th European Workshop on Structural Health Monitoring
CountryPoland
CityCracow
Period7/2/087/4/08

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ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Safety, Risk, Reliability and Quality

Cite this

Kirikera, G., Balogun, O., & Krishnaswamy, S. (2008). Fiber Bragg gratings and two wave mixing spectral demodulator system for impact detection and localization. In Proceedings of the 4th European Workshop on Structural Health Monitoring (pp. 840-846). (Proceedings of the 4th European Workshop on Structural Health Monitoring).