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Applications of Flexible Ultrasonic Transducer Array for Defect Detection at 150 °C
Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, QC H3A 2K6, Canada
National Research Council Canada, Boucherville, QC J4B 6Y4, Canada
Department of Mechanical Engineering, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Shan, Tao-Yuan 333, Taiwan
Center for Biomedical Engineering, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Shan, Tao-Yuan 333, Taiwan
Healthy Aging Research Center, Chang Gung University, 259 Wen-Hwa 1st Rd., Kwei-Shan, Tao-Yuan 333, Taiwan
* Author to whom correspondence should be addressed.
Received: 22 November 2012; in revised form: 10 January 2013 / Accepted: 10 January 2013 / Published: 15 January 2013
Abstract: In this study, the feasibility of using a one dimensional 16-element flexible ultrasonic transducer (FUT) array for nondestructive testing at 150 °C is demonstrated. The FUT arrays were made by a sol-gel sprayed piezoelectric film technology; a PZT composite film was sprayed on a titanium foil of 75 µm thickness. Since the FUT array is flexible, it was attached to a steel pipe with an outer diameter of 89 mm and a wall thickness of 6.5 mm at 150 °C. Using the ultrasonic pulse-echo mode, pipe thickness measurements could be performed. Moreover, using the ultrasonic pulse-echo and pitch-catch modes of each element of FUT array, the defect detection was performed on an Al alloy block of 30 mm thickness with a side-drilled hole (SDH) of f3 mm at 150 °C. In addition, a post-processing algorithm based on the total focusing method was used to process the full matrix of these A-scan signals of each single transmitter and multi-receivers, and then the phase-array image was obtained to indicate this defect- SDH. Both results show the capability of FUT array being operated at 150 °C for the corrosion and defect detections.
Keywords: flexible ultrasonic transducer array; PZT sol-gel; pulse-echo mode; pitch-catch mode; total focusing method; phased-array imaging; defect detection
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MDPI and ACS Style
Shih, J.-L.; Wu, K.-T.; Jen, C.-K.; Chiu, C.-H.; Tzeng, J.-C.; Liaw, J.-W. Applications of Flexible Ultrasonic Transducer Array for Defect Detection at 150 °C. Sensors 2013, 13, 975-983.
Shih J-L, Wu K-T, Jen C-K, Chiu C-H, Tzeng J-C, Liaw J-W. Applications of Flexible Ultrasonic Transducer Array for Defect Detection at 150 °C. Sensors. 2013; 13(1):975-983.
Shih, Jeanne-Louise; Wu, Kuo-Ting; Jen, Cheng-Kuei; Chiu, Chun-Hsiung; Tzeng, Jing-Chi; Liaw, Jiunn-Woei. 2013. "Applications of Flexible Ultrasonic Transducer Array for Defect Detection at 150 °C." Sensors 13, no. 1: 975-983.