Semi-passive Enhancement of Sensitivity of Piezoelectric Acoustic Sensor with Negative Impedance Matching Circuit

Author

Zhang Wenqun ; Wu Xinyue ; Zhang Meng

Author_Institution

Coll. of Naval Archit. & Ship, Naval Univ. of Eng., Wuhan, China

Volume

3

fYear

2010

fDate

13-14 March 2010

Firstpage

315

Lastpage

320

Abstract

New semi-passive negative impedance matching technology is put forward to enhance the sensitivity of piezoelectric acoustic sensor at low frequencies; what´s more, the bandwidth of high sensitivity is very broad. Mason electro-mechanical equivalent model of piezoelectric acoustic sensor is established and analyzed. Based on impedance matching theory, the parameters of matching circuit are obtained. The sensitivity of this semi-passive piezoelectric sensor with the proper parameters can even exceed that of no matching circuit over 20 dB in broad band of low frequency. It is validated by experimental measurements.

Keywords

acoustic transducers; impedance matching; piezoelectric devices; electromechanical equivalent model; impedance matching theory; negative impedance matching circuit; piezoelectric acoustic sensor; semi-passive enhancement; Acoustic measurements; Acoustic noise; Acoustic sensors; Capacitance; Coupling circuits; Frequency; Impedance matching; Low-frequency noise; Piezoelectric materials; Sensor systems; matching circuit; negative impedance; piezoelectric acoustic sensor; sensitivity;

fLanguage

English

Publisher

ieee

Conference_Titel

Measuring Technology and Mechatronics Automation (ICMTMA), 2010 International Conference on

Conference_Location

Changsha City

Print_ISBN

978-1-4244-5001-5

Electronic_ISBN

978-1-4244-5739-7

Type

conf

DOI

10.1109/ICMTMA.2010.73

Filename

5459554