数字图像相关法的量值溯源方法及计量校准装置

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中图分类号：0348.1 文献标志码：A 文章编号：1000-582X（2025）08-111-12

doi：10.11835/j.issn.1000-582X.2025.08.010

Value traceability methods metrological calibration devices for digital image correlation techniques

WU Yu'，YUAN Jing'，WANG Lifang'，XUE Rui²，TANG Yiwen' （1. Inspection， 401123，P.R. China; 2. ，Ltd.， 401120，P.R. China）

Abstract：The digital image correlation （DIC） method currently suffrs from inadequate systematic calibration methods an underdeveloped metrological traceability system.To address these challenges，this study proposes a novelcalibration methodology based on laser interferometry，integrated with acustom-designed optical system for local deformation measurements.Finite element simulations are employed to analyze the stress stiffening effect instrain platesunder tensile loading.Acoupled thermo-mechanical model is developedvia theoretical analysis experimental validation to quantitatively assess the influence convective heat transfer on surface strain measurement accuracy.Furthermore，an Abbe error compensation mechanism is implemented to effectively mitigate nonlinear measurement erors induced bymicroscale bending during loading.A comprehensive uncertainty analysis is conducted to evaluate both stard uncertainty components the overall measurement uncertainty.Experimental results demonstrate that the proposed calibration device reduces the uncertainty in stard strain field measurements to the range 1.9% to 0.83% ，fering a critical advancement toward establishing a traceable calibration framework for DIC-based strain measurement systems.

Keywords： digital image correlation（DIC）; strain measurement; metrological traceability; finite element analysis; Abbe error; convective heat transfer

数字图像相关法（digital image correlation method，DIC）是一种光学非接触式测量物体应变场的图像分析方法[1-2]，是基于双目视觉原理以被测对象的光学散斑图像为信息载体，通过处理变形前后的散斑图像直接获取全场位移和应变分布的系统。（剩余13301字）