| 摘要 |
PROBLEM TO BE SOLVED: To provide a dark-field particle measurement method and a device for it, capable of visualizing the Brownian movement of submicron particles which are smaller than the wavelength of visible light for measuring the position and movement amount of each particle for measurement of the particle size and the coefficient of viscosity. SOLUTION: Light flux from a light source 3 is converged by a collector lens 4 and formed into a cylindrical zone light by means of a zone optical system 5 to be collected to a sample liquid, including particles by means of a condenser lens 6. The scattered light from a sample body 7 is received by an object lens 8, having a focal distance larger than that of the condenser lens 6. The image from the object lens 8 is magnified by a projection optical system 9 to be received by a CCD sensor 10. An acquired dark field image is measured by an image processing flow meter 11 for finding the number, the position, and the moving amount of the particles. In a computing circuit 12, diffusion time using a means movement distance of the particles and the field time interval of the CCD sensor is substituted in the Einstein-Stokes relation related to the Brownian movement, and then the particle size is found and displayed by a display device 13. COPYRIGHT: (C)2005,JPO&NCIPI
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