{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T08:33:17Z","timestamp":1777624397889,"version":"3.51.4"},"reference-count":40,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2017,6,4]],"date-time":"2017-06-04T00:00:00Z","timestamp":1496534400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this study, a flexible ultrasonic transducer (FUT) was applied in a laser ultrasonic technique (LUT) for non-destructive characterization of metallic pipes at high temperatures of up to 176 \u00b0C. Compared with normal ultrasound transducers, a FUT is a piezoelectric film made of a PZT\/PZT sol-gel composite which has advantages due to its high sensitivity, curved surface adaptability and high temperature durability. By operating a pulsed laser in B-scan mode along with the integration of FUT and LUT, a multi-mode dispersion spectrum of a stainless steel pipe at high temperature can be measured. In addition, dynamic wave propagation behaviors are experimentally visualized with two dimensional scanning. The images directly interpret the reflections from the interior defects and also can locate their positions. This hybrid technique shows great potential for non-destructive evaluation of structures with complex geometry, especially in high temperature environments.<\/jats:p>","DOI":"10.3390\/s17061285","type":"journal-article","created":{"date-parts":[[2017,6,6]],"date-time":"2017-06-06T10:53:09Z","timestamp":1496746389000},"page":"1285","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["The Use of Flexible Ultrasound Transducers for the Detection of Laser-Induced Guided Waves on Curved Surfaces at Elevated Temperatures"],"prefix":"10.3390","volume":"17","author":[{"given":"Tai Chieh","family":"Wu","sequence":"first","affiliation":[{"name":"College of Mechanical and Electrical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4711-530X","authenticated-orcid":false,"given":"Makiko","family":"Kobayashi","sequence":"additional","affiliation":[{"name":"Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 8608555, Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5197-1339","authenticated-orcid":false,"given":"Masayuki","family":"Tanabe","sequence":"additional","affiliation":[{"name":"Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 8608555, Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1187-5438","authenticated-orcid":false,"given":"Che Hua","family":"Yang","sequence":"additional","affiliation":[{"name":"College of Mechanical and Electrical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan"}]}],"member":"1968","published-online":{"date-parts":[[2017,6,4]]},"reference":[{"key":"ref_1","first-page":"7","article-title":"High temperature ultrasonic transducers: Review","volume":"63","year":"2008","journal-title":"Ultragarsas Ultrasound"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"469","DOI":"10.1016\/S1359-0286(98)80009-0","article-title":"Materials for high-temperature piezoelectric transducers","volume":"3","author":"Damjanovic","year":"1998","journal-title":"Curr. Opin. Solid State Mater. Sci."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"3153","DOI":"10.1111\/j.1551-2916.2011.04792.x","article-title":"Piezoelectric materials for high temperature sensors","volume":"94","author":"Zhang","year":"2011","journal-title":"J. Am. Ceram. Soc."},{"key":"ref_4","first-page":"259","article-title":"Development of high temperature ultrasonic transducers for under-sodium viewing applications","volume":"31","author":"Fothergill","year":"1987","journal-title":"Br. J. Non Destr. Test."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1016\/j.ultras.2007.06.001","article-title":"1\u20133 Connectivity lithium niobate composites for high temperature operation","volume":"47","author":"Schmarje","year":"2007","journal-title":"Ultrasonics"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"232901","DOI":"10.1063\/1.3524192","article-title":"High temperature ultrasonic transducer up to 1000 \u00b0C using lithium niobate single crystal","volume":"97","author":"Baba","year":"2010","journal-title":"Appl. Phys. Lett."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"142","DOI":"10.1784\/insi.2007.49.3.142","article-title":"High temperature acoustic emission tests using lithium niobate piezocomposite transducers","volume":"49","author":"Kirk","year":"2007","journal-title":"Insight Non Destr. Test. Cond. Monit."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"343","DOI":"10.1016\/j.phpro.2015.08.081","article-title":"High Temperature Ultrasonic Transducer for Real-time Inspection","volume":"70","author":"Amini","year":"2015","journal-title":"Phys. Procedia"},{"key":"ref_9","unstructured":"Technologies, I.A. (2015). Developing Permanently Installed System for Ultrasonic Thickness Monitoring Based on HotSense\u00ae Technology, Ionix."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"983","DOI":"10.1016\/j.proeng.2016.11.321","article-title":"Development of low frequency high temperature ultrasonic transducers for in-service monitoring of pipework in power plants","volume":"168","author":"Dhuttia","year":"2016","journal-title":"Procedia Eng."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"157","DOI":"10.1016\/j.ndteint.2008.11.003","article-title":"High-temperature integrated and flexible ultrasonic transducers for nondestructive testing","volume":"42","author":"Kobayashi","year":"2009","journal-title":"NDT E Int."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"07KC11","DOI":"10.7567\/JJAP.53.07KC11","article-title":"PbTiO3\/Pb(Zr,Ti)O3 sol\u2013gel composite for ultrasonic transducer applications","volume":"53","author":"Inoue","year":"2014","journal-title":"Jpn. J. Appl. Phys."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1109\/JSEN.2005.856119","article-title":"High-temperature piezoelectric film ultrasonic transducers by a sol-gel spray technique and their application to process monitoring of polymer injection molding","volume":"6","author":"Kobayashi","year":"2006","journal-title":"IEEE Sens. J."},{"key":"ref_14","unstructured":"Barrow, D.A., Petroff, T.E., and Sayer, M. (1996). Method for Producing Thick Ceramic Films by a Sol Gel Coating Process. (5,585,136), U.S. Patent."},{"key":"ref_15","unstructured":"Kobayashi, M., Jen, C.K., Ono, Y., and Kruger, S. (2004, January 23\u201327). Lead-free thick piezoelectric films as miniature high temperature ultrasonic transducers. Proceedings of the 2004 IEEE Ultrasonics Symposium, Montreal, QC, Canada."},{"key":"ref_16","first-page":"5","article-title":"Integratable high temperature ultrasonic transducers for NDT of metals and industrial process monitoring","volume":"26","author":"Kobayashi","year":"2005","journal-title":"CINDE J."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Kobayashi, M., Jen, C.K., Hui, R., Yick, S., and Wu, K.T. (2006, January 2\u20136). Fabrication and characterization of thick film piezoelectric ultrasonic transducers. Proceedings of the 2006 IEEE Ultrasonics Symposium, Vancouver, BC, Canada.","DOI":"10.1109\/ULTSYM.2006.213"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"951","DOI":"10.1088\/0964-1726\/13\/4\/033","article-title":"Piezoelectric thick bismuth titanate\/PZT composite film transducers for smart NDE of metals","volume":"13","author":"Kobayashi","year":"2004","journal-title":"Smart Mater. Struct."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2103","DOI":"10.1109\/TUFFC.2010.1659","article-title":"Flexible metallic ultrasonic transducers for structural health monitoring of pipes at high temperatures","volume":"57","author":"Shih","year":"2010","journal-title":"IEEE Trans. Ultrason. Ferroelectr. Freq. Control"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"139","DOI":"10.1109\/TUFFC.2015.2501241","article-title":"Bismuth titanate fabricated by spray-on deposition and microwave sintering for high-temperature ultrasonic transducers","volume":"63","author":"Searfass","year":"2016","journal-title":"IEEE Trans. Ultrason. Ferroelectr. Freq. Control"},{"key":"ref_21","unstructured":"Eason, T.J., Bond, L.J., and Lozev, M.G. (2016, January 13\u201317). Ultrasonic Sol-Gel Arrays for Monitoring High-Temperature Corrosion. Proceedings of the 19th World Conference on Non-Destructive Testing 2016, Munichm, Germany."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1478","DOI":"10.1109\/TUFFC.2006.1665105","article-title":"Flexible ultrasonic transducers","volume":"53","author":"Kobayashi","year":"2006","journal-title":"IEEE Trans. Ultrason. Ferroelectr. Freq. Control"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"505","DOI":"10.4028\/www.scientific.net\/KEM.347.505","article-title":"Structural health monitoring of aerospace structures with sol-gel spray sensors","volume":"347","author":"Ouahabi","year":"2007","journal-title":"Key Eng. Mater."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Jen, C.K., Wu, K.T., Kobayashi, M., and Blouin, A. (2008, January 2\u20135). NDE using laser generated ultrasound and ultrasonic transducer receivers. Proceedings of the 2008 IEEE Ultrasonics Symposium, Beijing, China.","DOI":"10.1109\/ULTSYM.2008.0369"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1551","DOI":"10.1109\/58.808880","article-title":"Remote laser generation of narrow-band surface waves through optical fibers","volume":"46","author":"Bcrndl","year":"1999","journal-title":"IEEE Trans. Ultrason. Ferroelec. Freq. Control"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"116","DOI":"10.1016\/0030-4018(82)90378-9","article-title":"Laser-generation of directional surface acoustic wave pulses in metals","volume":"42","author":"Aindow","year":"1982","journal-title":"Opt. Commun."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"783","DOI":"10.1016\/S0041-624X(02)00210-X","article-title":"Nondestructive Evaluation of Cylindrical Parts Using Laser Ultasonics","volume":"40","author":"Clorennec","year":"2002","journal-title":"Ultrasonics"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"623","DOI":"10.1016\/S0041-624X(03)00178-1","article-title":"Laserultrasonic Generation of Lamb Waves in the Reaction Rorce Range","volume":"41","author":"Shi","year":"2003","journal-title":"Ultrasonics"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"96","DOI":"10.1016\/j.jnucmat.2010.11.018","article-title":"A novel procedure employing laser ultrasound technique and simplex algorism for the characterization of mechanical and geometrical properties in Zircaloy tubes with different levels of hydrogen charging","volume":"408","author":"Liu","year":"2011","journal-title":"J. Nucl. Mater."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Yang, C.-H., and Tang, S.-W. (2009, January 18\u201320). Characterization of material properties in solid oxide fuel cells using a laser ultrasound technique. Proceedings of the Symposium on Ultrasonic Electronics, Kyoto, Japan.","DOI":"10.1109\/ULTSYM.2009.5441527"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"3476","DOI":"10.1121\/1.4709115","article-title":"Laser ultrasound technique for material characterization of thermal sprayed nickel aluminum coatings in elevated temperature environment","volume":"131","author":"Yeh","year":"2012","journal-title":"J. Acoust. Soc. Am."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"3202","DOI":"10.1016\/j.compscitech.2007.04.006","article-title":"An NDT technique for composite structure using visualized Lamd-wave propagation","volume":"67","author":"Yashiro","year":"2007","journal-title":"Compos. Sci. Technol."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"3816","DOI":"10.1088\/0957-0233\/18\/12\/017","article-title":"Health monitoring of complex curved structures using an ultrasonic wavefield propagation imaging system","volume":"18","author":"Lee","year":"2007","journal-title":"Meas. Sci. Technol."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"3513","DOI":"10.1016\/j.nucengdes.2010.06.011","article-title":"Application of ultrasonic wave propagation imaging method to automatic damage visualization of nuclear power plant pipeline","volume":"240","author":"Lee","year":"2010","journal-title":"Nucl. Eng. Des."},{"key":"ref_35","first-page":"530","article-title":"Simultaneous measurement of the phase and group velocities of Lamb waves in a laser-generation based imaging method","volume":"20","author":"Nishino","year":"2011","journal-title":"Ultrasonic"},{"key":"ref_36","doi-asserted-by":"crossref","unstructured":"Yang, C.-H., and Liu, I.-H. (2011, January 7\u201311). Optical visualization of acoustic wave propagating along the wedge tip. Proceedings of the Seventh International Symposium on Precision Engineering Measurements and Instrumentation, Lijiang, China.","DOI":"10.1117\/12.904838"},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Wu, C.-H., and Yang, C.-H. (2011, January 7\u201311). Laser ultrasound technique for ray tracing investigation of Lamb wave tomography. Proceedings of the Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011, San Diego, CA, USA.","DOI":"10.1117\/12.881087"},{"key":"ref_38","unstructured":"Wu, C.-H., Tseng, S.-P., and Yang, C.-H. (2012, January 7\u201310). A full-field mechanical property mapping reconstruction algorithm with quantitative laser ultrasound visualization system. Proceedings of the 2012 IEEE Ultrasonics Symposium, Dresden, Germany."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"173","DOI":"10.1016\/j.optlastec.2015.04.026","article-title":"Application of laser ultrasonic technique for non-contact detection of structural surface-breaking cracks","volume":"73","author":"Zhou","year":"2015","journal-title":"Opt. Laser Technol."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"415","DOI":"10.1016\/j.ijleo.2015.09.175","article-title":"Detection of surface defects for longitudinal acoustic waves by a laser ultrasonic imaging technique","volume":"127","author":"Zeng","year":"2016","journal-title":"Opt. Int. J. Light Electron Opt."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/17\/6\/1285\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T18:37:57Z","timestamp":1760207877000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/17\/6\/1285"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2017,6,4]]},"references-count":40,"journal-issue":{"issue":"6","published-online":{"date-parts":[[2017,6]]}},"alternative-id":["s17061285"],"URL":"https:\/\/doi.org\/10.3390\/s17061285","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2017,6,4]]}}}