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Common-path two-wavelength interferometer with submicron precision for profile measurements in on-line applications

机译:亚微米精度的共路径两波长干涉仪,用于在线应用中的轮廓测量

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摘要

We propose a common-path two-wavelength interferometric system based on a single optical element, a Savart plate, that is able to obtain single-shot profile measurements with submicron precision from safe working distances (beyond 100 mm). These characteristics make this sensor ideal for surface inspection in on-line applications. For the illumination branch, two lasers with close wavelengths are combined and then passed through a rotating holographic diffuser for drastic speckle reduction. In the acquisition branch, the interferometric signals of both wavelengths are captured simultaneously by a camera, and their phase signals are combined to extend the measurement range.
机译:我们提出了一种基于单一光学元件Savart板的共路径两波长干涉测量系统,该系统能够从安全工作距离(超过100毫米)以亚微米精度获得单次轮廓测量。这些特性使该传感器非常适合在线应用中的表面检查。对于照明分支,将两个具有近波长的激光组合在一起,然后通过旋转的全息漫射器以大幅减少斑点。在采集分支中,两个波长的干涉信号均由摄像机同时捕获,并且将它们的相位信号合并以扩展测量范围。

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