The fine-structured electrical spark is a complex gas discharge phenomenon, which appears as a cluster involving dozens of closely-packed thin plasma filaments that can be revealed by laser shadowgraphy. However, the immense complexity of the spark, together with the features of laser imaging, challenges the spark image processing. Herein, we developed an image processing procedure, providing outstanding shadowgram denoising while preserving the spark image capacity. By employing this procedure, we show that the passage of laser radiation through the spark is accompanied by complicated diffraction, entailing pronounced changes in the radiation intensity distribution in the zones with strong filament overlapping.

中文翻译：

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从激光阴影图中提取精细结构的电火花的高对比度衍射图

精细结构的电火花是一种复杂的气体放电现象，表现为由数十个紧密堆积的细等离子灯丝组成的簇，这些现象可以通过激光阴影照相术揭示出来。然而，火花的巨大复杂性以及激光成像的特征对火花图像处理提出了挑战。本文中，我们开发了一种图像处理程序，可在保留火花图像容量的同时提供出色的阴影图降噪。通过采用该程序，我们显示出激光辐射通过火花会伴随复杂的衍射，从而在具有强丝重叠的区域中导致辐射强度分布发生明显变化。