| 摘要 |
PURPOSE:To measure the X, Y, and Z value of a sample stably by equalizing mechanisms which equalize two optical paths on a standard and a sample side in the quantity of light, distributing light energy uniformly in incident luminous flux, and performing zero resetting, standard matching, and measurement in one cycle. CONSTITUTION:Light from a light source 1 passes through a lens and a rotating disk 8 and is distributed through a prism 4 to the sample-side optical path 23 to the sample 10 and the standard-side optical path 24 to a standard plate 11. The light of either optical path passes through an aperture of the rotating disk 8, and reflected light beams from the sample 10 and standard plate 11 are photodetected by the X, Y, and Z photodetectors 13, 14, and 15 of an integrating sphere 12 individually. The quantities of light of those two optical paths are equalized to each other through photodetectors 17 and 19 on the optical paths by the upward/downward movement of a light-quantity adjusting diaphragm 21. The standard plate, sample 10, and a reference standard plate 11 are set and irradiated with light whose quantity is adjusted to find the X, Y, and Z absolute values of the measured sample. Pieces of luminous flux 23 and 24 are passed through three apertures at equal intervals of the rotating disk 8 by turns to perform the zero resetting, standard matching, and measurement in a 120 deg. rotation of the disk 8. |
