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六十年代由于激光技术的促进,全息术获得了迅速发展,并很快被引进风洞测量技术中.它不仅可以对同一张全息图进行纹影、阴影分析,而且可以克服原来马赫干涉仪要求结构精密、造价昂贵、难于调整的缺点,以取代马赫干涉仪进行流场的定量分析.为了获得能进行定量分析的有限条纹干涉图,必须控制干涉图中未扰动区背景条纹的方向和间距.我们
In the 1960s, due to the advancement of laser technology, holography gained rapid development and was quickly introduced into wind tunnel measurement technology. It can not only perform shadowing and shadow analysis on the same hologram but also overcome the requirements of the original Mach interferometer The structure of which is expensive and hard to be adjusted.Many interferometer is used to replace the Mach-Zehnder interferometer for the quantitative analysis of the flow field.In order to obtain the finite fringe pattern which can be quantitatively analyzed, the direction and spacing of the background fringes in the undisturbed region must be controlled. we