因为冲击波反映了折射率的明显和突然的变化，他们能在纹影摄影中清楚地被展现出来。

Because shock waves represent a stark and sudden change in refractive index, they show up clearly in schlieren photographs.

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通过高速纹影图像从细观角度详细研究了不同传播条件下瓦斯爆炸火焰前锋的细微结构。

Using high speed schlieren photographs the microstructure of flame front surface in gas explosion was studied from the microscopic view.

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这就给形貌影栅云纹法的测量和处理实验系统带入一个不确定的初始系统误差，它对正确分析实验测试误差带来许多困难。

Accordingly, an uncertain initial system error appears in the measuring system of shadow moire profilometry and makes it difficult to get reliable results in error analysis procedures.

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