Comprehensive calibration and accuracy evaluation method for digital speckle pattern interferometry based on three-axis angular motion measurement theory

• Published in: Optical engineering Vol. 64; no. 7; p. 074105
• Main Authors: Li, Renhao, Yan, Yang, Wu, Sijin, Li, Weixian, Si, Juanning, Niu, Haisha, Kuang, Cuifang
• Format: Journal Article
• Language: English
• Published: Society of Photo-Optical Instrumentation Engineers 01.07.2025
• Subjects: digital speckle pattern interferometry; accuracy evaluation; optical measurement; calibration
• ISSN: 0091-3286; 1560-2303
• DOI: 10.1117/1.OE.64.7.074105

Results of digital speckle pattern interferometry (DSPI) measurements are subject to errors due to the superposition of multiple source errors. Currently, the promotion and application of this technique are hindered due to the lack of effective calibration methods. In this article, a DSPI three-axis angular motion measurement error model is established, and a comprehensive calibration and accuracy evaluation method based on the three-axis angular motion measurement theory is proposed to achieve accurate calibration and accuracy evaluation of DSPI systems. Experiments showed that the average relative errors of pitch, yaw, and roll angle measurements are reduced from 5.36%, 5.04% and 4.8% to 4.05%, 2.62% and 2.04%, respectively, after the calibration. The proposed method can effectively improve the DSPI measurement accuracy and also evaluate the accuracy of the DSPI measurement system.