Fig. 1. Definition of BRDF

Fig. 2. BRDF test system diagram

Fig. 3. Parent-block diagram with different reflectivities

Fig. 4. Test photo of coating parent-block sample

Fig. 5. BRDF test results of green substrate at 0° incident angle

Fig. 6. BRDF test results of green substrate at 10-40° incident angle

Fig. 7. BRDF test results of blue substrate at 10-40° incident angle

Fig. 8. BRDF test results of cylinder at 0-40° incident angle

Fig. 9. BRDF equivalent parent-blocks of cylinder

Fig. 10. BRDF test results of equivalent parent-blocks of cylinder at 0-40°incident angle

Fig. 11. Comparison of the accuracy of the scattering light intensity test data between the 0° incident green-blue-outer parent block and the cylindrical sample