| 摘要 |
PURPOSE:To take an accurate continuous mesurement of turbidity stably and easily by guiding light transmitted through a sample cell into an integrating sphere, and detecting separately the diffusion reflected light of totally transmitted light and the diffusion reflected light of scattered transmitted light and displaying the ratio of their outputs. CONSTITUTION:Parallel luminous flux projected by a light source 1 is made incident to the integrating sphere 3 through the sample cell 2 and an opening 4. Transmitted light except the scattered transmitted light enters a rotary sector 6 equipped with a diffusion reflecting part 9 and a gap part 10 through an opening 5, and light reflected by the reflection part 9 and scattered transmitted light are reflected repeatedly in the integrating sphere to enter a photodetector 8. The transmitted light incident to the gap part 10 of the rotary sector 6 through the opening 5 is absorbed by a trap 7 and only the scattering transmitted light is diffused and reflected repeatedly in the integrating sphere 3 to be mode incident to the photodetector 8. Both output signals from the photodetector 8 are separated by a changeover switch 22 and held by holding circuits 23 and 23, whose output ratio is calculated continuously and displayed on an indicator 21. Consequently, an accurate measurement of the turbid is taken stably and easily. |
