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ARTICLE

Experimental Study on the Relationship Between PZT Excitation Voltage and Testing Sensitivity of Coating Structures by Electro-Mechanical Impedance Method

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1 NDT & E Laboratory, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
2 Corresponding author: Li LIN, Dalian University of Technology, Dalian 116024, P.R. China, Tel: 0086-0411-84707117, E-mail: linli@dlut.edu.cn
3 Surface Engineering Laboratory, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China

Structural Longevity 2010, 4(2), 95-103. https://doi.org/10.3970/sl.2010.004.095

Abstract

Two kinds of plasma sprayed Cr₂O₃ coating specimens are tested by electro-mechanical impedance (EMI) method with PZT patch. Quantitative relationship between PZT excitation voltage and testing sensitivity is investigated in the frequency range of 150-180 kHz. Combined with WK 6500B precision impedance analyzer and self-established high excitation voltage electric impedance measurement system (HEVEIMS), excitation voltages with the range of 0.01 to 20 V are used to excite the PZT patch. As an evaluation indicator of sensitivity, the difference value of one minus correlation coefficient (OMCC) is calculated for each excitation voltage. The results show that in the above frequency range, the OMCC values are not monotonic with the increasing of excitation voltages. The influences of output voltage stability, noise, bonding condition and power consumption of the PZT patch, etc on the sensitivity are generally analyzed. This study provides a guiding reference for the clarification of EMI mechanism as well as the selection of PZT excitation voltage for coating structure characterization with EMI method.

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