TY - JOUR
T1 - Detection of fundamental shear horizontal guided waves using a surface-bonded chirped fiber-bragg-grating fabry-perot interferometer
AU - Liu, Guigen
AU - Philtron, Jason
AU - Zhu, Yupeng
AU - Rose, Joseph L.
AU - Han, Ming
N1 - Funding Information:
Manuscript received December 1, 2017; revised January 21, 2018; accepted February 16, 2018. Date of publication February 21, 2018; date of current version March 20, 2018. This work was supported by the Office of Naval Research under Grant N000141712819 and Grant N000141410456. (Corresponding author: Ming Han.) G. Liu is with the Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511 USA (e-mail: guigenliu @hotmail.com).
Publisher Copyright:
© 1983-2012 IEEE.
PY - 2018/6/1
Y1 - 2018/6/1
N2 - In this paper, detection of the fundamental shear horizontal (SH0) guided wave mode in a plate using a surface-bonded Fabry-Perot interferometer formed by a pair of tandem chirped fiber-Bragg-gratings (CFBG-FPI) has been investigated both theoretically and experimentally. Using the developed theory, the underlying mechanism that governs the sensor's response to SH0 mode is explored in detail. Then, the dependence on both the incident angle and frequency (or wavelength) of the SH0 wave is investigated. Owing to the pure shear strain induced by the SH0 mode, the fiber sensor shows a significantly different response in comparison to other ultrasonic waves, such as Lamb-type guided waves. Our results show that 1) the sensor is most sensitive to SH-type waves at an incident angle of around 45° and nonsensitive at the incident angles of 0° and 90° and 2) a minimum sensitivity is reached when the equivalent ultrasonic wavelength impinged on the fiber axis is equal to the effective length of the CFBG-FPI sensor; this effective length is close to the length of each CFBG.
AB - In this paper, detection of the fundamental shear horizontal (SH0) guided wave mode in a plate using a surface-bonded Fabry-Perot interferometer formed by a pair of tandem chirped fiber-Bragg-gratings (CFBG-FPI) has been investigated both theoretically and experimentally. Using the developed theory, the underlying mechanism that governs the sensor's response to SH0 mode is explored in detail. Then, the dependence on both the incident angle and frequency (or wavelength) of the SH0 wave is investigated. Owing to the pure shear strain induced by the SH0 mode, the fiber sensor shows a significantly different response in comparison to other ultrasonic waves, such as Lamb-type guided waves. Our results show that 1) the sensor is most sensitive to SH-type waves at an incident angle of around 45° and nonsensitive at the incident angles of 0° and 90° and 2) a minimum sensitivity is reached when the equivalent ultrasonic wavelength impinged on the fiber axis is equal to the effective length of the CFBG-FPI sensor; this effective length is close to the length of each CFBG.
KW - Chirped fiber Bragg gratings
KW - Fabry-Perot interferometer
KW - fiber-optic sensor
KW - shear horizontal waves
KW - structural health monitoring
KW - ultrasonic guided waves
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U2 - 10.1109/JLT.2018.2808686
DO - 10.1109/JLT.2018.2808686
M3 - Article
AN - SCOPUS:85042361621
SN - 0733-8724
VL - 36
SP - 2286
EP - 2294
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 11
M1 - 8299544
ER -