數(shù)字圖像相關法的量值溯源方法及計量校準裝置

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中圖分類號：0348.1 文獻標志碼：A 文章編號：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

數(shù)字圖像相關法（digital image correlation method，DIC）是一種光學非接觸式測量物體應變場的圖像分析方法[1-2]，是基于雙目視覺原理以被測對象的光學散斑圖像為信息載體，通過處理變形前后的散斑圖像直接獲取全場位移和應變分布的系統(tǒng)。（剩余13301字）