| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus and a method for measuring a dynamic light scattering particle size distribution whereby the particle size distribution of a sample to be measured can be obtained by measuring a Brownian motion velocity of the sample in the presence of a flow such as in a factory piping or the like. SOLUTION: In the dynamic light scattering particle size-measuring apparatus 1, a laser light La irradiates the sample S to be measured which has particles C scattering in a solvent and performing a Brownian motion, a back scattering light Lb by the particles C is detected with the use of a photodetector and the particle size distribution is measured with the use of the back scattering light Lb. The apparatus is provided with a branch pipe 3 branching from the piping 2 where the sample S flows and forming a reservoir part 3a small enough to make the flow of the sample S negligible, a light transmission window 4a set to a part of the branch pipe 3 where the reservoir part 3a is formed, and an optical system 4b for collecting the back scattering light Lb generated from inside the branch pipe 3 near the light transmission window 4a to the photodetector.
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