TY - GEN
T1 - Highly-sensitive π-phase-shifted Fiber-Bragg-grating ultrasonic sensors for structural health monitoring
AU - Fink, Thomas
AU - Zhang, Qi
AU - Guo, Fawen
AU - Arhens, Wayne
AU - Han, Ming
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84863904218&partnerID=8YFLogxK
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M3 - Conference contribution
AN - SCOPUS:84863904218
SN - 9781934551127
T3 - International SAMPE Technical Conference
BT - SAMPE 2012 Conference and Exhibition
T2 - 2012 SAMPE International Symposium and Exhibition - Emerging Opportunities: Materials and Process Solutions
Y2 - 21 May 2012 through 24 May 2012
ER -