| 摘要 |
<p>PURPOSE:To obtain a reflectivity measuring apparatus, which can avoid the interference between the reflected light from a surface to be measured and the reflected light from the surface of a coating layer and can positively measure the reflectivity for the surface to be measured when the reflectivity of the surface to be measured having the coating layer is measured. CONSTITUTION:Laser light L is cast on a surface, whose reflectivity is measured, 2 having a coating layer 1 through a splitting means 10 having a condenser lens system 3. The reflected lights L0, L1... from the surface, whose reflectivity is measured, 2 and the reflected light L-1 from a surface 1S of the coating layer 1 are split into the different light paths with the splitting means 10. Then, only the reflected lights L0, L1... from the surface, whose reflectivity is measured, 2 are introduced into a photodetector 4.</p> |
