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| Influence of Excitation Side Parameters on Laser Induced Pressure Propagation Properties and Methods to Improve the Measurement Accuracy of Space Charge |
| Ma Yidan1, Qi Tianrun1, Ren Hanwen1,2, Gao Haoyu1, Li Qingmin1,2 |
1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China;
2. Beijing Key Lab of HV and EMC North China Electric Power University Beijing 102206 China |
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Abstract Laser induced pressure propagation (LIPP) method is one of the commonly used methods to measure solid insulating materials. In the process of space charge measurement using LIPP, different excitation schemes induce pressure pulses with different waveforms, pulse widths, and amplitudes, and the pressure wave characteristics further directly affect the charge measurement results. The pressure wave characteristics further directly affect the charge measurement results. However, few studies have been conducted to discuss the effects of the excitation side schemes on the pressure wave characteristics as well as the measured signal waveforms, spatial resolution and signal-to-noise ratio.
In order to visually analyse the characteristics of pressure waveform, pulse width and amplitude, this paper builds a high-frequency and narrow pulse width pressure pulse signal detection platform based on piezoelectric thin film, and combines it with the LIPP method of space charge measurement system, to visually analyze the effects of laser parameters and target electrode materials on pressure waveform and space charge measurement results. The different mechanisms of elastic wave generation and propagation are further analyzed in combination with the constructed three-dimensional simulation model of laser ablation elastic wave propagation, and the optimal excitation scheme suitable for the proposed laser-induced pressure wave measurement device is selected.
The experimental and simulation results show that the laser single pulse energy, spot diameter and target electrode material have significant effects on the pressure wave generation and charge measurement signal results. Due to the simultaneous existence of thermal elastic and ablation effects in the process of laser ablation of the target electrode, the pressure wave generated is a positive and negative bimodal waveform. With the increase of energy, the amplitude of the ablation pressure pulse and the charge signal increases linearly synchronously, while the amplitude of the pressure wave generated by the thermal elastic effect is almost unchanged. Secondly, the pressure wave generated by the Gaussian beam with a larger diameter has less influence on its own diffraction attenuation during the propagation process, and the increase of the laser spot diameter can effectively increase the ablation area of the target electrode, thereby increasing the pressure wave energy, but the continuous increase of the diameter will reduce the energy density, resulting in a logarithmic increase of the pressure wave amplitude. Finally, under the same laser parameters, the surface constraint of the aluminum electrode can be increased by spraying micron-level atomized graphite spray, and the absorption performance of aluminum to the laser can be enhanced, so as to further improve the pressure wave intensity.
The use of metallic aluminum sprayed with micron-thick graphite layer as the target material, together with the excitation laser with 340 mJ single pulse energy and 10 mm spot diameter, significantly improves the accuracy of the space charge measurement, and the resolution of the system reaches 14 μm. At the same time,through the analysis of the measurement results of the space charge of the polyimide under the strong-field polarization, the validity of the excitation scheme is proved, and it provides an idea for the study of the design of the excitation scheme of the LIPP method and the propagation mechanism of the pressure wave.
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Received: 27 June 2024
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2025, Vol. 40 
