Background: The design and analysis of protective systems requires a detailed understanding of, and the ability to accurately predict, the distribution of pressure loads acting on an obstacle following an explosive detonation. In particular, there is a pressing need for accurate characterisation of blast loads in the region very close to a detonation, where even small improvised devices can produce serious structural or material damage. Objective: Accurate experimental measurement of these near-field blast events, using intrusive methods, is demanding owing to the high magnitudes (> 100 MPa) and short durations (< 1 ms) of loading. The objective of this article is to develop a non-intrusive method for measuring reflected blast pressure distributions using image analysis. Methods: This article presents results from high speed video analysis of near-field spherical PE4 explosive blasts. The Canny edge detection algorithm is used to track the outer surface of the explosive fireball, with the results used to derive a velocity-radius relationship. Reflected pressure distributions are calculated using this velocity-radius relationship in conjunction with the Rankine-Hugoniot jump conditions. Results: The indirectly measured pressure distributions from high speed video are compared with directly measured pressure distributions and are shown to be in good qualitative agreement with respect to distribution of reflected pressures, and in good quantitative agreement with peak reflected pressures (within 10% of the maximum recorded value). Conclusions: The results indicate that it is possible to accurately measure blast loads in the order of 100s MPa using techniques which do not require sensitive recording equipment to be located close to the source of the explosion.

中文翻译：

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使用高速视频的反射近场爆炸压力测量

背景：保护系统的设计和分析需要详细了解爆炸物爆炸后作用在障碍物上的压力载荷分布，并具有准确预测的能力。特别是，迫切需要在非常接近爆炸的区域准确表征爆炸载荷，即使是小型简易装置也会造成严重的结构或材料损坏。目标：由于加载的强度高 (> 100 MPa) 和持续时间短 (< 1 ms)，因此需要使用侵入式方法对这些近场爆炸事件进行准确的实验测量。本文的目的是开发一种使用图像分析测量反射爆炸压力分布的非侵入式方法。方法：本文介绍了近场球形 PE4 爆炸爆炸的高速视频分析结果。Canny 边缘检测算法用于跟踪爆炸火球的外表面，其结果用于推导出速度-半径关系。使用这种速度-半径关系并结合 Rankine-Hugoniot 跳跃条件来计算反射压力分布。结果：将来自高速视频的间接测量的压力分布与直接测量的压力分布进行比较，并且表明在反射压力分布方面具有良好的定性一致性，并且与峰值反射压力（在 10% 以内）具有良好的定量一致性。最大记录值）。结论：