Laser diffraction particle sizing method using a monomode optica

Details Laser diffraction particle sizing method using a monomode optica Laser diffraction particle sizing method using a monomode optica

1995-10-09

1997-03-11

Henry, Jon W.

Optics: measuring and testing

For size of particles

356336, 356338, 356343, G01N 1502, G01N 2147

Patent

active

056107129

ABSTRACT:
A fiber optic spatial filter assembly for laser diffraction particle sizing apparatus utilizing a laser to generate a monochromatic light beam which is coupled to an optical fiber operating substantially in a monomode and creating a beam of light having a high degree of spatial coherence which is then passed through collimating lenses to interrogate and impinge upon the particles of matter through which the laser diffracted light passes. The light scattered by the particles is focused onto a Fourier plane and thereafter impinges upon a photooptical detector array, positioned coincident with the Fourier plane, for measuring the light intensities of the scattered light by scattering angle, thus enabling the computation of particle size.

REFERENCES:
patent: 4975237 (1990-12-01), Brown
patent: 5498904 (1996-01-01), Horn et al.

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