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Scanning dimensional measurement using laser-trapped microsphere with optical standing-wave scale

机译:使用带有激光驻波标尺的激光捕获微球进行扫描尺寸测量

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摘要

We propose a laser trapping-based scanning dimensional measurement method for free-form surfaces. We previously developed a laser trapping-based microprobe for three-dimensional coordinate metrology. This probe performs two types of measurements: a tactile coordinate and a scanning measurement in the same coordinate system. The proposed scanning measurement exploits optical interference. A standing-wave field is generated between the laser-trapped microsphere and the measured surface because of the interference from the retroreflected light. The standing-wave field produces an effective length scale, and the trapped microsphere acts as a sensor to read this scale. A horizontal scan of the trapped microsphere produces a phase shift of the standing wave according to the surface topography. This shift can be measured from the change in the microsphere position. The dynamics of the trapped microsphere within the standing-wave field was estimated using a harmonic model, from which the measured surface can be reconstructed. A spherical lens was measured experimentally, yielding a radius of curvature of 2.59 mm, in agreement with the nominal specification (2.60 mm). The difference between the measured points and a spherical fitted curve was 96 nm, which demonstrates the scanning function of the laser trapping-based microprobe for free-form surfaces.
机译:我们提出了一种基于激光捕获的自由曲面扫描尺寸测量方法。我们先前开发了一种基于激光陷波的微探针,用于三维坐标计量。该探头执行两种类型的测量:触觉坐标和同一坐标系中的扫描测量。所提出的扫描测量利用了光干扰。由于回射光的干扰,在激光捕获的微球和被测表面之间产生了驻波场。驻波场产生有效的长度标尺,被捕获的微球充当读取该标尺的传感器。捕获的微球的水平扫描会根据表面形貌产生驻波的相移。可以根据微球位置的变化来测量这种位移。使用谐波模型估计驻波场中捕获的微球的动力学,可以从中重建被测表面。对球面透镜进行了实验测量,得出的曲率半径为2.59 mm,与标称规格(2.60 mm)一致。测量点与球形拟合曲线之间的差为96 nm,这证明了基于激光捕获的微探针对自由曲面的扫描功能。

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