Zeyu Zhang, Xiaohong Liu, Zonghua Zhang, Nan Gao, Zhaozong Meng. Method for Refraction Effect Compensation of Liquid Crystal Display in Direct Phase Measuring Deflectometry[J]. Laser & Optoelectronics Progress, 2020, 57(19): 191205
- Laser & Optoelectronics Progress
- Vol. 57, Issue 19, 191205 (2020)
Fig. 1. Schematic of DPMD
Fig. 2. Schematic of DPMD considering refraction
Fig. 3. Schematic of refraction by transparent layer
Fig. 4. Light path refracted by transparent layer
Fig. 5. Screen image used for refraction parameter calibration
Fig. 6. Multiple cameras used for observing same feature point
Fig. 7. Calculation model of refraction angle
Fig. 8. Structural diagram of experimental system
Fig. 9. Physical figures. (a) Concave mirror; (b) specular step
Fig. 10. Measured 3D shape of specular step
Fig. 11. Reconstruction error of concave mirror. (a) Before compensation; (b) after compensation
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Table 1. True value, measured value and compensation value of specular step and their errorsunit: mm
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