Particle measuring apparatus

Details Particle measuring apparatus Particle measuring apparatus

1989-03-23

1991-05-21

Willis, Davis L.

Optics: measuring and testing

For size of particles

By particle light scattering

356338, 356339, 356246, G01N 1502, G01N 2151

Patent

active

050170082

ABSTRACT:
Disclosed is an apparatus for measuring particles or particulates in a fluid in a measuring cell provided with a measuring window through which a laser beam is projected or through which light scattered from the particles passes. The surface of the measuring window is spherical with a radius of curvature whose center is at a point on which the laser beam converges for measurement. With this arrangement, light focused on the convergence point or light coming from the point always passes through the interface between the window and the fluid in the cell at an angle that is normal thereto. Thus no reflection of the light passing through the window occurs at the interface with the result that fluctuations of the refractive index of the fluid in the cell do not effect the focusing point of the light.

REFERENCES:
patent: 4673289 (1987-06-01), Gaucher

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