Jun Wu, Yuheng Zhu, Shaobo Yuan, Shaoyu Liu, Meimiao Zhang. Distortion Correction of Visual Measurement in Inhomogeneous Temperature Field Based on Ray Tracing Method[J]. Laser & Optoelectronics Progress, 2023, 60(1): 0108001
- Laser & Optoelectronics Progress
- Vol. 60, Issue 1, 0108001 (2023)
Fig. 1. Schematic diagram of the background schlieren experiment
Fig. 2. Case of light passing through an axisymmetric temperature field
Fig. 3. Principle of ray tracing based on Runge-Kutta method
Fig. 4. Experimental device for establishing refractive index field
Fig. 5. Schematic diagram of background schlieren imaging. (a) Original image; (b) image affected by flame
Fig. 6. Processing results of particle migration images
Fig. 7. Distribution of refractive index field
Fig. 8. Schematic diagram of checkerboard correction experiment
Fig. 9. Experimental system for correcting imaging distortion
Fig. 10. Calibration process of the imager
Fig. 11. Coordinates of 5 white point centers
Fig. 12. Extraction result of white point center
Fig. 13. Distortion curves before and after correction
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Table 1. Distortion and correction of checkerboard corners
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