Min Lu, Zhile Wang, Pingping Gao, Shuqing Zhang, Jikai Guo. A Sub-Aperture Scanning Fourier Transform System for Fast BRDF Measurements[J]. Acta Optica Sinica, 2020, 40(13): 1329001
- Acta Optica Sinica
- Vol. 40, Issue 13, 1329001 (2020)
Fig. 1. Principle of BRDF measurement and the BiRT-2.0 BRDF measurement system
Fig. 2. Coordinates of field distributions in the spatial and Fourier domains. (a) Space coordinates; (b) Fourier domain coordinates
Fig. 3. Radiance coordinate diagram under Fourier optical transform
Fig. 4. Variation trend of incident angle with cos4θ
Fig. 5. Sub-aperture stitching principle
Fig. 6. Samples to be tested and the scratch measured under microscope
Fig. 7. Experimental scheme
Fig. 8. Angular scattering spectrum of the standard diffuse plane
Fig. 9. Angular scattering spectrum of the mirror
Fig. 10. Angular scattering spectrum of the scratched mirror
Fig. 11. BRDF comparison of the standard diffuse plane
Fig. 12. BRDF comparison of the mirror
Fig. 13. BRDF comparison of the scratched mirror
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