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REN Ming-yang, WANG Li-zhong, FU Bai-qiang, CHEN Ren-hong, WU Hong, WANG Yan-peng. Error correction of glass medium in high temperature digital image correlation deformation measurement[J]. Chinese Optics. doi: 10.37188/CO.2021-0144
Citation: REN Ming-yang, WANG Li-zhong, FU Bai-qiang, CHEN Ren-hong, WU Hong, WANG Yan-peng. Error correction of glass medium in high temperature digital image correlation deformation measurement[J]. Chinese Optics. doi: 10.37188/CO.2021-0144

Error correction of glass medium in high temperature digital image correlation deformation measurement

doi: 10.37188/CO.2021-0144
Funds:  Supported by National Natural Science Foundation of China (No. 51865057); AECC Sichuan Gas Turbine Establishment Entrusted Project (No. J201912024)
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  • In order to correct the measurement error caused by glass medium in high temperature deformation measurement, this paper takes glass medium as a part of camera calibration model. Based on photogrammetry technology and digital image correlation method, a binocular camera calibration method in complex environment is proposed and applied to high temperature deformation measurement. Firstly, aiming at the calibration difficulty caused by the poor image quality in complex environment, the camera imaging model with distortion correction is adopted to complete the binocular camera calibration by bundle adjustment camera calibration method, which improves the success rate and stability of calibration. Secondly, aiming at the problem of low calibration accuracy of binocular camera in complex environment, the influence of lens focal length, ambient light interference and the distance between glass and camera on the calibration results is analyzed, and the optimal calibration parameters are given, so that the calibration reprojection error is reduced from 0.832 pixels to 0.132 pixels. Finally, the measurement error of calibration with and without glass is compared by using the measurement environment with glass medium, which proves that this method can greatly reduce the measurement error. The test results show that this method can effectively reduce the measurement error of displacement field caused by glass medium in high temperature environment. The maximum decrease of measurement error of displacement field in X, Y and Z axes is 76.26 %, 75.02 % and 42.02%, respectively. The method in this paper can achieve high-precision camera calibration in complex environments, and has good calibration stability. It is an effective way to realize accurate measurement of high temperature deformation.
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