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One-shot shape measurement of small objects with a pulsed laser and modulation of polarization

机译:脉冲激光和偏振调制可一次性测量小物体的形状

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摘要

We present an alternative shape measurement setup based on a one-shot phase-shifting method employing the modulation of polarization and phase grating interferometry. The setup implementation was carried out with a Mach-Zehnder interferometric arrangement and a synchronized system of a pulsed laser and a fast camera. Under the proposed configuration, a test object is illuminated by two beams of circularly polarized light oppositely rotating, coming from the interferometric arrangement. The reflected light is then conduced to a phase grating interferometry system to generate several phase-shifted fringe patterns in one-shot. To show the feasibility of our proposal, we present some experimental results of a retrieved wrapped phase of a test object and analyzed it using a quality-guide phase unwrapping algorithm to obtain the continuous phase.
机译:我们提出了一种基于单次相移方法的替代形状测量设置,该方法采用了偏振调制和相位光栅干涉测量法。通过Mach-Zehnder干涉仪以及脉冲激光和快速相机的同步系统进行设置。在所提出的配置下,来自干涉测量装置的两个反向旋转的圆偏振光束照亮了测试对象。然后,将反射的光引导至相位光栅干涉仪系统,以一次生成几个相移的条纹图案。为了展示我们的建议的可行性,我们提出了一些测试对象的包裹相位的实验结果,并使用质量指导相位展开算法对其进行了分析,以获得连续相位。

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