Twyman-Green型横向剪切干涉仪的原理和应用

Principle and application of a Twyman-Green lateral shearing interferometer

本文介绍了一种新型横向剪切干涉仪的工作原理。该干涉仪使用Twyman-Green干涉仪作为分束器,光栅作为检测元件,并利用实时Moire差分法消除干涉仪的系统误差。这种干涉仪的优点在于灵敏度可调,抗振性强,易做成大口径。利用这种干涉仪检测超高音速风洞中的流场和真实火箭燃气射流,取得了一些重要结果。

This paper presents the operating principle of a new lateral shearing interferometer. It uses a Twyman-Green interferometer as a splliter, a grating obtained from interference fringes with a tested phase object as a detective element to elimilate system errors. The merits of this interferometer are adjustable sensitivity, antivibration and very large aperture. We used the interferometer with large-aperture to detect flow fields intsuper-sonic wind tunnels and rocket exhaust plumes and obtained important results.