| 摘要 |
[Problem] The purpose of the present invention is to measure the diameter of particles by placing a detector on the optical axis of a beam radiated from a light source, and detecting the forward-scattered light generated by particles contained in a particle swarm. Furthermore, the purpose of the present invention is the unique, accurate measurement of the diameter of particles while reducing as much as possible the amount of light from the light source that is directly incident without being scattered by the particles. [Solution] The present invention is basically based on the knowledge that particle diameter can be uniquely measured by measuring the maximum forward-scattered light intensity. In order to do so, the radiation pressure of a focused laser beam is used to induce particles contained in the particle swarm to the beam focus position, and the amount of directly incident light which has not be scattered by the particles is reduced as much as possible. The particle diameter measurement device and the particle diameter measurement method use the optical radiation pressure from the incident light to force the particles to move to the beam focus position, and detect the forward-scattered light. |
