Electrical tuning for sensitivity enhancement of a piezo-electric ultrasonic transducer: Simulation and fabrication
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DOI 10.1007/s12206-020-0707-1
Journal of Mechanical Science and Technology 34 (8) 2020 Original Article DOI 10.1007/s12206-020-0707-1 Keywords: · KLM model · Peizo-electric ultrasonic transducer · Electrical impedance tuning
Correspondence to: Ki-Bok Kim [email protected]
Citation: Kim, G., Hwang, Y.-I., Seo, M.-K., Kim, K.-B. (2020). Electrical tuning for sensitivity enhancement of a piezo-electric ultrasonic transducer: Simulation and fabrication. Journal of Mechanical Science and Technology 34 (8) (2020) ?~?. http://doi.org/10.1007/s12206-020-0707-1
Received March 22nd, 2020 Revised
May 30th, 2020
Accepted June 12th, 2020 † Recommended by Editor No-cheol Park
Electrical tuning for sensitivity enhancement of a piezo-electric ultrasonic transducer: Simulation and fabrication Geonwoo Kim1,2, Young-In Hwang3, Mu-Kyung Seo3 and Ki-Bok Kim2,3 1
Environmental Microbial and Food Safety Laboratory, Agricultural Research Service, U.S. Department of 2 Agriculture, Powder Mill Rd. Bldg. 303, BARC-East, Beltsville, MD, US, Department of Science of Meas3 urement, University of Science and Technology, 217, Gajeong-ro, Yuseong-gu, Daejeon, Korea, Center for Safety Measurement, Korea Research Institute of Standards and Science, 267, Gajeong-ro, Yuseonggu, Daejeon, Korea
Abstract
In this study, two simple electrical impedance tuning methods derived from Krimholtz, Leedom, and Matthaei (KLM) modeling were proposed for increasing the sensitivity of a piezo-electric material-based ultrasonic transducer. In the first method, the reactance components of the ultrasonic transducer were removed, and in the other method, the electrical impedance of an ultrasonic transducer was matched to that of the ultrasonic system. To these ends, electrical circuits composed of inductors and capacitors were de-signed and KLM simulations of the two methods were performed. To verify the simulation results, ultrasonic transducers were fabricated and operated under the same conditions as in the simulations, and the experimental results were compared with the simulated results. In conclusion, the electrical tuning method (elimination of the reactance compo-nents) was more effective and the transducer circuit structure was simpler. The experi-mental results showed good agreement with the KLM simulation results.
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Ultrasonic testing (UT), a part of the non-destructive testing (NDT) field, has been used for defect detection, physical property evaluation, deterioration diagnosis, and structural health monitoring in various industries. Generally, an ultrasonic testing system (UTS) is composed of ultrasonic transducers, a pulse generator/receiver, an oscilloscope, and a test material [1-3]. The ultrasonic response signals provide valuable acoustic information about various material properties of the test specimen. Moreover, the pulse-echo waveforms can be used to analyze the characteristics of the ultrasonic transducers [2, 3].
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