| 摘要 |
PURPOSE:To obtain a high-practical device which obtain accurately a grain size distribution as an absolute value even when the number of scattered particles is large by detecting scattered light of laser light in a scattering optical path length area adjusted according to transmittivity due to a particle group to be measured. CONSTITUTION:End surfaces of the specific number of optical fibers 41-4n are arranged at intervals of an extremely fine angle DELTAtheta corresponding to a scatter angle theta on a photodetection system side isolated by glass 12 from the scattering optical path area, and an optical fiber 15 for measuring transmitted light is provided on an optical axis. Then, the transmittivity of laser light in the scattering optical path area of specific length to the particle group 3 to be measured is found through glass plates 11 and 12. Then the scattering optical length L is set and then a computer system 7 calculates a scattered light intensity distribution from the intensity of scattered light found at a position corresponding to the scatter angle theta respectively to calculate the grain size distribution from the scattered light intensity distribution according to the relation shown by a specific equation. |
