TY - GEN
T1 - Fiber-optic acoustic emission sensor based on a chirped FBG pair for crack detection in aluminum plate
AU - Liu, Guigen
AU - Hu, Lingling
AU - Zhu, Yupeng
AU - Han, Ming
N1 - Funding Information:
This work was partially supported by the U.S. Office of Naval Research under grant no. N000141410456 and N000141613185.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
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U2 - 10.12783/shm2017/13986
DO - 10.12783/shm2017/13986
M3 - Conference contribution
AN - SCOPUS:85032433312
T3 - Structural 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
SP - 1192
EP - 1197
BT - Structural Health Monitoring 2017
A2 - Chang, Fu-Kuo
A2 - Kopsaftopoulos, Fotis
PB - DEStech Publications
T2 - 11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017
Y2 - 12 September 2017 through 14 September 2017
ER -