@Article{sl.2010.004.095,
AUTHOR = {Ji-Cheng Li, Li Lin, Di Wu, Xi-Meng Li, Ming-Kai Lei},
TITLE = {Experimental Study on the Relationship Between PZT Excitation Voltage and Testing Sensitivity of Coating Structures by Electro-Mechanical Impedance Method},
JOURNAL = {Structural Longevity},
VOLUME = {4},
YEAR = {2010},
NUMBER = {2},
PAGES = {95--103},
URL = {http://www.techscience.com/sl/v4n2/42715},
ISSN = {1944-6128},
ABSTRACT = {Two kinds of plasma sprayed Cr<sub>2</sub>O<sub>3</sub> 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.},
DOI = {10.3970/sl.2010.004.095}
}