| 摘要 |
The concentration of particles suspended in a fluid, having a refractive index which differs from that of the fluid, is accomplished using polarized light. The degree of depolarization of the incident light indicates the concentration of the particles in the fluid. While maintaining a constant observation angle, the distance between the light source unit and the detector unit is varied thus changing the focal point of the system. In this manner, suspended particle concentrations at varying distances from the light source and detector unit are obtained.
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