基于影像测量的三等标准金属线纹尺检定不确定度评定

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摘要：以激光干涉仪为主标准器，结合显微镜瞄准和CCD影像采集装置检定三等金属线纹尺的实际长度，已成为目前常用的检定方法。文中从多个方面分析该方法检定三等金属线纹尺实际长度的测量不确定度来源，得到满足要求的评定结果。

关键词：影像测量；三等标准金属线纹尺；不确定度评定；激光干涉仪

Uncertainty Evaluation for the Grade Ⅲ Standard Metallic Scale Verification Based on Imaging Measurements

LI Qiaoli

（ Fujian Metrology Institute， Fuzhou 350003， Fujian， China ）

Abstract： It is currently the commonly utilized calibration methodology that employs the laser interferometer as the main standard， combining with microscope aiming and CCD image acquisition device， to verify the actual length of the grade Ⅲ standard metallic scale. The source of the measurement uncertainty in the actual length of the grade Ⅲ standard metallic scale verified by this method is analyzed from many aspects， and the evaluation results that meet the requirements are obtained.

Key Words：  Imaging measurements; GradeⅢstandard metallic scale; Uncertainty evaluation; Laser interferometer

0 引言

三等标准金属线纹尺（以下简称“三等线纹尺”）多用于检定水准标尺、钢直尺及其他线纹尺，其材质主要有锌白铜、不锈钢和黄铜等[1]，外形结构见图1。（剩余2973字）