Method and apparatus for optically measuring, without contact, t

Details Method and apparatus for optically measuring, without contact, t Method and apparatus for optically measuring, without contact, t

1989-03-21

1990-05-22

Willis, Davis L.

Optics: measuring and testing

For size of particles

By particle light scattering

356337, 356338, G01N 2147

Patent

active

049272675

ABSTRACT:
The invention relates to the measurement of the granulometry of a cloud of particles or of the roughness of a surface in real time and without contact, by means of an apparatus comprising: a convergent lens (9) adapted for forming a diffraction pattern of the cloud of particles or of the surface: multiplier means (10) adatped for multiplying this diffraction pattern, in intensity, by a function f(r) such that

REFERENCES:
patent: 4037964 (1977-07-01), Wertheimer et al.
patent: 4037965 (1977-07-01), Weiss
patent: 4052600 (1977-10-01), Wentheimer
patent: 4167335 (1979-09-01), Williams

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