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  • Open Access

    ABSTRACT

    The influence of PZT excitation voltage on the testing sensitivity of electro-mechanical impedance method for coatings

    Li Jicheng, Lin Li, Wu Di, Li Ximeng

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 43-44, 2011, DOI:10.3970/icces.2011.017.043

    Abstract Two kinds of plasma sprayed Cr2O3 coating specimens are tested with electro-mechanical impedance (EMI) method. Quantitative investigation on the relationship between PZT excitation voltage and sensitivity of EMI method is performed in the frequency range of 100-110 kHz, with WK 6500B precision impedance analyzer and high excitation voltage electric impedance measurement system (HEVEIMS). A series of excitation voltage are designed from 0.01 to 15 V. Root mean square deviation (RMSD) of the PZT electric impedance signatures is used as an evaluation indicator. The results show that in the frequency range of 100-110 kHz, the RMSD More >

  • Open Access

    ABSTRACT

    The influence of frequency band on the testing sensitivity of coating structure by electro-mechanical impedance method in kHz and MHz frequency ranges

    Lin Li, Li Jicheng, Wu Di, Li Ximeng

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.2, pp. 39-40, 2011, DOI:10.3970/icces.2011.017.039

    Abstract Two kinds of plasma sprayed Cr2O3 coatings are tested with electro-mechanical impedance (EMI) method. The influence of frequency band on the testing sensitivity of EMI method is investigated in kHz and MHz frequency ranges. The frequency shifts and root mean square deviation (RMSD) of the PZT electric impedance signatures are used as evaluation indicator. The variation of EMI sensitivity is investigated on 8 frequency bands with high mode density in the frequency ranges of 0.1-600 kHz and 1-10 MHz. The results show that in the low frequency range, the frequency shifts increase and the RMSD More >

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