[1] [1] A. Mostafapour, S. Davoodi, and M. Ghareaghaji, “Acoustic emission source location in plates using wavelet analysis and cross time frequency spectrum,” Ultrasonics, 2014, 54(8): 2055–2062.

[2] [2] Z. W. Jin, M. S. Jiang, Q. M. Sui, F. Y. Zhang, and L. Jia, “Acoustic emission source linear localization based on an ultra-short FBGs sensing system,” Photonic Sensors, 2014, 4(2):152–155.

[3] [3] T. Fu, Z. C. Zhang, Y. J. Liu, and J. S. Leng, “Development of an artificial neural network for source localization using a fiber optic acoustic emission sensor array,” Structural Health Monitoring, 2015, 14(2):168–177.

[4] [4] A. Mohimi, T. H. Gan, and W. Balachandran, “Development of high temperature ultrasonic guided wave transducer for continuous in service monitoring of steam lines using non-stoichiometric lithium niobate piezoelectric ceramic,” Sensors and Actuators A: Physical, 2014, 216(1): 432–442. X. N. Jiang, K. Kim, S. J. Zhang, J. Johnson, and G. Salazar, “High-temperature piezoelectric sensing,” Sensors, 2013, 14(1): 144–169.

[5] [5] K. J. Kirk, C. W. Scheit, and N. Schmarje, “High-temperature acoustic emission tests using lithium niobate piezocomposite transducers,” Insight-Non-Destructive Testing and Condition Monitoring, 2007, 49(3): 142–145.

[6] [6] H. Zu, H. Wu, and Q. M. Wang, “High-temperature piezoelectric crystals for acoustic wave sensor applications,” IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control, 2016, 63(3): 486–505.

[7] [7] G. H. Sun, M. Q. Bo, C. J. Zhang, and J. Z. Pan, “Propagation characteristics of acoustic signal in the circle waveguide rod of two conditions,” Journal of East China University of Science and Technology (Natural Science Edition), 2010, 36(6): 851–858.

[8] [8] N. Dixon, R. Hill, and J. Kavanagh, “Acoustic emission monitoring of slope instability: development of an active waveguide system,” Proceedings of ICE: Geotechnical Engineering, 2003, 156(2): 83–95.

[9] [9] D. S. Cheon, Y. B. Jung, E. S. Park, W. K. Song, and H. I. Jang, “Evaluation of damage level for rock slopes using acoustic emission technique with waveguides,” Engineering Geology, 2011, 121(1): 75–88.

[10] [10] C. Crunelle, M. Wuilpart, C. Caucheteur, and P. Mégret, “Original interrogation system for quasi-distributed FBG-based temperature sensor with fast demodulation technique,” Sensors and Actuators A: Physical, 2009, 150(2): 192–198.

[11] [11] A. Minardo, A. Cusano, R. Bernini, L. Zeni, and M. Giordano, “Response of fiber Bragg gratings to longitudinal ultrasonic waves,” IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control, 2005, 52(2): 304–312.

[12] [12] D. D. Pang and Q. M. Sui, “A relocatable resonant FBG-acoustic emission sensor with strain-insensitive structure,” Optoelectronics Letters, 2014, 10(2): 96–99.