| 摘要 |
PURPOSE:To enable measurement of a color in a short period without errors by measuring the color after the reflected light from filter paper in gaseous flow attains a stationary state. CONSTITUTION:The filter paper 2 is inserted into the 1st cell 1. While an exhaust gas is introduced into the cell, the light from the 1st light projecting device 11 is projected to the filter paper 2. The reflected light generated from the filter paper 2 is received in the 1st light receiving device 12. The stationary state of the reflected light is judged by the output from the 1st light receiving device 12 and the output from a pressure sensor 14. Since the temp. in the 1st cell 1 is controlled to about 100 deg.C, the sticking of the moisture in the exhaust gas to the filter paper 2 is prevented and the measurement error by the moisture is prevented. The part of the filter paper 2 where ash sticks is fed to the 2nd cell 7 after the judgment of the stationary state. The color of the ash is then judged by a powder color judging means 22 using the 2nd light projecting device 17 and the 2nd light receiving device 18 which are not contaminated with the exhaust gas in accordance with the output of the 2nd light receiving device 18. The exact measurement of the color of the ash is thus made possible. |
