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| Impact of Acoustic Impedances of the Electrodes on the Recovery Algorithm and Measured Results in Pulsed Electro-Acoustic Method |
| Ren Hanwen1, Li Qingmin1, Wang Jingrui1, Liu Tao1, Wang Zhongdong2 |
1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China;
2. School of Electrical and Electronic Engineering The University of Manchester Manchester M13 9PL UK |
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Abstract Accurate recovery of distorted measurement waveforms is a key process of research for space charge measurement when using the pulsed electro-acoustic (PEA) method. Based on the equivalent model of interfacial acoustic waves, the simulation results indicates that the difference of acoustic impedances between upper electrode and sample can affect the measured wave component. Combined with the propagation process of acoustic waves under electric pulses, the theoretical analysis indicates that the difference of acoustic impedance can further influence the process of attenuation recovery and charge quantity conversion. Based on the derivation process of attenuation coefficient and voltage-charge conversion coefficient, an improved recovery algorithm was proposed for charge measurement of single-layer and multi-layer samples considering the influence of acoustic impedance of upper electrode. Recovery results of the waveforms measured by different upward electrodes were used to verify the algorithm. Meanwhile, comparative analysis indicates that the difference of acoustic impedances between electrode and sample should be included in recovery calculations even if the semi-conductive material is selected as the upper electrode. Moreover, by recovering the waveform of a double-layer sample, the improved algorithm was proved to be used in the waveform recovery of multi-layer samples.
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Received: 26 December 2018
Published: 12 February 2020
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2020, Vol. 35 
