Method and apparatus for particle size analysis

Details Method and apparatus for particle size analysis Method and apparatus for particle size analysis

1989-03-03

1991-10-15

Willis, Davis L.

Optics: measuring and testing

For size of particles

By particle light scattering

356343, G01N 1502, G01N 2153

Patent

active

050569180

ABSTRACT:
Methods and apparatus for measuring the intensity of light scattered by particles suspended in a sample volume illuminated by an interrogating light beam directed along an input axis, utilizing plural Fourier optical systems having lenses arranged for illuminating multiple photodetectors. The lenses of each Fourier optical system can be of different optical powers, for providing low power and high power optical trains. A low power optical train provides high resolution measurements of light scattered within a small angular range at low angles relative to the input axis, while a high power optical train provides lower resolution measurements of light scattered within a larger angular range at higher angles.

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