CHEN Lei,XU Yang,XU Xiaobin,et al.Research on attitude measurement technology of free flying model under window distortion correction[J].Optics and Precision Engineering,2022,30(04):455-463.
CHEN Lei,XU Yang,XU Xiaobin,et al.Research on attitude measurement technology of free flying model under window distortion correction[J].Optics and Precision Engineering,2022,30(04):455-463. DOI: 10.37188/OPE.20223004.0455.
Research on attitude measurement technology of free flying model under window distortion correction
During hypersonic wind tunnel tests, the pose information of a model supports the reliability of the experimental data, and the measurement accuracy of these data has a significant impact on the test results. Binocular vision measurement systems can measure the attitude parameters of free flight test models in a hypersonic wind tunnel. The system is usually placed outside of the wind tunnel test section and observes the model through a glass window situated on a wall of the test section. However, the glass window distorts the image and reduces the measurement accuracy. This paper proposes a measurement method to correct the glass window distortion. By modeling the image surface distortion caused by refraction through the glass window, a correction method is proposed based on the linear fitting of marker points to eliminate the image distortion and improve the measurement accuracy. Moreover, a binocular vision measurement system is developed at the scene of the
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1 m hypersonic wind tunnel test, and a six degrees of freedom attitude of a free flight model is successfully measured. The results show that the measuring accuracy was greater than 0.5 mm when the measuring range was 1 m × 1 m × 1 m. Therefore, the system satisfies the requirements of subsequent pneumatic data analysis.
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