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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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.