Method for the illumination of particles contained in a medium f

Details Method for the illumination of particles contained in a medium f Method for the illumination of particles contained in a medium f

1987-01-05

1988-10-11

Willis, Davis L.

Optics: measuring and testing

For size of particles

By particle light scattering

356339, 356244, G01N 2149

Patent

active

047766972

ABSTRACT:
The invention relates to a method for the illumination of particles contained in a medium for an optical analysis, and to an optical particle analyser. The medium (1) thereby makes contact with a window (2), and a light beam illuminating the particles is directed into the medium through the window in order to form an image of the particles. In order to enable an accurate quantitative and qualitative analysis carried out directly from the medium, the light beam is modified into a beam (5) having a predetermined thickness in the direction of the normal of the window. The beam (5) is directed to advance in the medium containing the particles close to and substantially in parallel with a window surface (6) making contact with the medium in order to illuminate particles (10) contained in a predetermined volume part (9) of the medium for the formation of an optical image (8).

REFERENCES:
patent: 3564262 (1971-02-01), Hach
patent: 3975084 (1976-08-01), Block

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