Title :
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
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;
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
DOI :
10.1109/ICMTMA.2010.73
