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5-beam grating interferometry for extended phase gradient sensing
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DOI：10.1364/OE.26.026872.png)
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摘要
En 中文
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. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Keyword:
LATERAL SHEARING INTERFEROMETER
WAVE-FRONT RECONSTRUCTION
DERIVATIVES
期刊
IF:
3.3
论文数:
6.1W
被引数:
14.3W
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