Patorski Krzysztof, Służewski Łukasz, Trusiak Maciej
Opt Express. 2018 Oct 15;26(21):26872-26887. doi: 10.1364/OE.26.026872.
A novel, single-shot, low-cost, multidirectional lateral shear interferometer for extended range wave front phase gradient sensing has been developed. It exploits the Fresnel diffraction field, which is formed by the five lowest diffraction orders of a simple binary amplitude checker grating. The Fresnel intensity pattern encodes information on four directional partial derivatives of the wave front under test. It has been theoretically, numerically, and experimentally shown that for larger gradient phase objects or shear amounts only the diagonal derivative information is easily accessible. The horizontal and vertical direction gradient maps are strongly amplitude modulated. Therefore, their demodulation becomes a challenging task. The same feature has been found in widely used quadriwave interferometer, which was developed at ONERA, France. The results of analytical and numerical studies and experimental works, including fringe pattern processing and phase demodulation, are presented.
一种用于扩展范围波前相位梯度传感的新型单次低成本多方向横向剪切干涉仪已被开发出来。它利用了由简单二元振幅棋盘光栅的五个最低衍射级形成的菲涅耳衍射场。菲涅耳强度图案编码了被测波前四个方向偏导数的信息。理论、数值和实验表明，对于较大梯度相位物体或剪切量，只有对角导数信息易于获取。水平和垂直方向梯度图受到强烈的振幅调制。因此，它们的解调成为一项具有挑战性的任务。在法国国家航空航天研究院（ONERA）开发的广泛使用的四波干涉仪中也发现了相同的特征。本文给出了分析、数值研究和实验工作的结果，包括条纹图案处理和相位解调。
