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| Research on Measurement Method of Electrical Impedance of Transducer under High Hydrostatic Pressure |
| JIA Meng-wen, ZHAO Peng, WANG Yue-bing |
| School of Measurement and Testing Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China |
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Abstract To solve the problem that electrical impedance of the transducer cannot be measured accurately by the impedance analyzer with continuous wave in small size cavity, a transducer impendence measurement method based on pulse sine signal excitation under high hydrostatic pressure is proposed.Based on the sampling resistance method, the number of sinusoidal pulses and measurable frequency range are determined by the cavity size to effectively eliminate the influence of the boundary reflection.Different transmission frequencies are setted and voltage waveform signals upon the transducer and sampling resistor are collected.The admittance is calculated while the phase difference and amplitude are obtained by three-parameter sine wave curve-fit method.Admittance characteristic is measured with pulse sine signal method under the water pressure ranging from 0 to 10MPa.The experimental results show that sinusoidal pulse method is proved to be a better choice to measure the admittance characteristics of transducers in a limited space, and that the resonant frequency of the transducer shifts, and the diameter of the admittance circle decreases as the pressure increases.
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Received: 20 May 2019
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Corresponding Authors:
赵鹏(1989-),男,江苏徐州人,中国计量大学实验师,从事声学计量相关工作。Email:zhaopeng@cjlu. edu. cn
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2020, Vol. 41 
