Analysis of Piezoelectric Acoustic Sensor Based on Negative Impedance with FEM in Composite Materials

Wen Qun Zhang; Xin Yue Wu; Wen Cao

doi:10.4028/www.scientific.net/AMR.321.109

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 321Analysis of Piezoelectric Acoustic Sensor Based on...

Analysis of Piezoelectric Acoustic Sensor Based on Negative Impedance with FEM in Composite Materials

Abstract:

Piezoelectric acoustic sensor with negative impedance matching circuit is put forward to enhance its sensitivity at low frequencies. The multi-physics problem coupled with sound wave equations, structure stress-strain equations, piezoelectric constitutive equations and electric ordinary equations is analyzed with FEM in detail. Frequency response characteristics are simulated when shunted with negative-capacitance, resistance in series. Sensitivity is obtained from 1kHz to 5kHz. When used proper electrical elements, the sensitivity of the piezoelectric sensor can even exceed that of no matching circuit over 2 factors in broad band.

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Periodical:

Advanced Materials Research (Volume 321)

Pages:

109-112

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.321.109

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Online since:

August 2011

Authors:

Wen Qun Zhang, Xin Yue Wu, Wen Cao

Keywords:

Coupled Multiphysics Fem, Negative Impedance, Piezoelectric Acoustic Sensor, Sensitivity

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