在风洞气流场的观察和显示中，纹影法是最常用的方法。
The techniques of schlieren is a conventional method for observing anddisplaying the wind-tunnel phenomena.
其中，光学法是基于二氧化碳与空气的折射率有差别，利用彩色纹影法和阴影法原理来判断泄漏；
The optic method, which based on the difference of the refractive indexes between carbon dioxide and air, estimate leaks according to principles of Schlieren and Shadow-graph.
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.
用双频光栅纹影剪切干涉法对无限热平板的自然对流温度场进行诊断。
This paper deals with the natural convection temperature field of unlimited heated Plate with schlieren shearing interferometry of double frequency gratings.
基于传统的概念，影栅云纹法只能实时获得表征物体大离面位移(深度)的条纹。
According to the traditional conception, the shadow moire fringes only give an indication of the large off-plane displacement w.
基于传统的概念，影栅云纹法只能实时获得表征物体大离面位移(深度)的条纹。
According to the traditional conception, the shadow moire fringes only give an indication of the large off-plane displacement w.
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