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Additive-subtractive two-wavelength ESPI contouring by using a synthetic wavelength phase shift

机译:使用合成波长相移的加减法两波长ESPI轮廓

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The addition correlation of two speckle fields by simultaneous illumination at different wavelengths is used for object contouring in a Twyman-Green-type interferometer. Fringe visibility is enhanced when the stochastic speckle background intensity obtained from a reference plane modulation is subtracted. We calculate the contour phase map by using a phase-shift algorithm in the synthetic wavelength. A comparison with a sequential illumination, phase difference method based on a laser wavelength phase shift is given. The test setup does not need to be stable on an interferometric scale, and therefore a method is provided that lends itself to applications in noisy environments. (C) 1998 Optical Society of America. [References: 14]
机译:在Twyman-Green型干涉仪中,通过同时照射不同波长的两个散斑场的相加相关被用于物体轮廓。当减去从参考平面调制获得的随机斑点背景强度时,边缘可见性得到增强。我们通过在合成波长中使用相移算法来计算轮廓相位图。给出了与基于激光波长相移的顺序照明相差法的比较。测试设置不需要在干涉仪规模上保持稳定,因此提供了一种适用于嘈杂环境中的应用程序的方法。 (C)1998年美国眼镜学会。 [参考:14]

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