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一种可用于风洞流场显示的双频光栅剪切干涉仪,它是在普通光栅干涉仪的基础上发展起来的一种用于光学检验和测量的干涉装置,其结构简单,容易调整,风洞流场显示中使用的各种纹影仪均可方便地进行改装。这种干涉仪的关键部件是一块带有两个不同空间频率的全息光栅,该光栅可以在普通光学实验室制作而无需任何精密的光学或机械加工,因此,与共它干涉仪相比,双频光栅剪切干涉仪更为经济实用。它的制作方法和剪切干涉原理,以及使用过程中发生的像畸变修正方法都作了介绍,并给出了在激波风洞流场显示中的初步实验结果。
A dual-frequency grating shear interferometer can be used for wind tunnel flow field display. It is an interference device for optical inspection and measurement developed on the basis of ordinary grating interferometer. Its structure is simple and easy to adjust, Wind tunnels are used in the flow field display various profiling instrument can be easily modified. A key component of this type of interferometer is a holographic grating with two different spatial frequencies that can be fabricated in a common optical lab without the need for any sophisticated optical or mechanical processing, Grating shear interferometer more economical and practical. The fabrication method, the principle of shear interference and the method of image distortion correction in use are introduced. The preliminary experimental results of the flow field in a shock tunnel are also given.