A Study of Recovery Algorithm Adapted to the Pulsed Electro-acoustic Method with Optical Excitation

An optical excitation-based pulsed electro-acoustic method has been suggested for high-resolution space charge measurements. However, it still requires a suitable charge recovery algorithm to complement it. By applying the electroacoustic pulse method, we were able to identify two elements that contribute to the distortion of the observed waveforms. These components are the combination of the elastic waveform caused by the thermoelastic effect, and the gradient distribution of the potential in the ring electrode. The formation mechanisms of the two aberrations are analyzed individually, and methods for restoring various aberrations are suggested. The proposed methods involve the utilization of virtual electrode distribution for potential compensation and extraction of interference components, respectively. Based on this premise, a recovery algorithm specifically designed for the pulsed electroacoustic method with optical excitation is established. The viability of the enhanced algorithm is confirmed by the outcomes of space charge recuperation in response to laser pulses. The comparison results indicate that the enhanced algorithm exhibits a much higher level of accuracy compared to earlier recovery algorithms. The results can support high temporal and spatial resolution space charge measurements under transient stresses