| 摘要 |
PURPOSE:To perform accurate measurement of the amount of reflection, by arranging a light source at a position perpendicular to a sample measuring reference plane, and arranging a pair of light receiving parts symmetrically with respect to a vertical axis connecting the light source and the sample measuring reference plane. CONSTITUTION:A light source 1 is arranged at a position, which is substantially perpendicular to a horizontal sample measuring reference plane A. A pair of equivalent light receiving parts is arranged at symmetrical positions with respect to a vertical Y axis, which connects the light source 1 and the plane A. An adding means 3, which electrically or optically adds the outputs of the light receiving parts 2 and 2, is connected. When a sample S is inclined with respect to the plane A, the output of one light receiving part 2 is changed. The output of the other light receiving part 2 is changed approximately symmetrically with respect to the output of the first light receiving part 2. The outputs of the light receiving parts 2 and 2 are added thereto. The the measured output, which is twice the output of the light receiving parts 2 and 2 when the sample S is set at the plane A, is obtained. When the measured output is divided by 2, the accurate measured output of the reflected amount can be obtained. |
