@Article{sl.2010.004.085,
AUTHOR = {Ji-Cheng Li, Li Lin, Di Wu, Xi-Meng Li, Ming-Kai Lei},
TITLE = {Experiments on the Testing Sensitivity for Microstructure Evolutions of Coatings by Electro-Mechanical Impedance Method in kHz and MHz Frequencies},
JOURNAL = {Structural Longevity},
VOLUME = {4},
YEAR = {2010},
NUMBER = {2},
PAGES = {85--93},
URL = {http://www.techscience.com/sl/v4n2/42714},
ISSN = {1944-6128},
ABSTRACT = {Two kinds of plasma sprayed Cr<sub>2</sub>O<sub>3</sub> coatings are characterized by
electro-mechanical impedance (EMI) method with PZT patch in kHz and MHz frequencies. Comparing frequency shift of impedance peaks f and root mean square
deviation (RMSD) of PZT electric impedance signatures, the influence of frequency
on the testing sensitivity is investigated in some frequency bands among 10-238
kHz and 5.45-6.33 MHz. The results show that in the kHz frequency range, the frequency shifts f increase with testing frequency and the RMSD values first increase
and then decrease. The latter may be attributed to the decreasing of peak number
and the decline of impedance magnitude. In MHz frequency range, the frequency
shifts f become more significant, and a prominent frequency shift of 206.1 kHz is
observed near 6 MHz. The RMSD values are also much larger than that in kHz
frequency range.},
DOI = {10.3970/sl.2010.004.085}
}