Optics: measuring and testing – For size of particles – By particle light scattering
Patent
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
Adams Bruce L.
Koren Matthew W.
Kowa Company Ltd.
Wilks Van C.
Willis Davis L.
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