基于影像測量的三等標準金屬線紋尺檢定不確定度評定

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摘要：以激光干涉儀為主標準器，結合顯微鏡瞄準和CCD影像采集裝置檢定三等金屬線紋尺的實際長度，已成為目前常用的檢定方法。文中從多個方面分析該方法檢定三等金屬線紋尺實際長度的測量不確定度來源，得到滿足要求的評定結果。

關鍵詞：影像測量；三等標準金屬線紋尺；不確定度評定；激光干涉儀

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

三等標準金屬線紋尺（以下簡稱“三等線紋尺”）多用于檢定水準標尺、鋼直尺及其他線紋尺，其材質主要有鋅白銅、不銹鋼和黃銅等[1]，外形結構見圖1。（剩余2973字）