G - Physics – 01 – B
Patent
G - Physics
01
B
33/63, 343/7
G01B 11/02 (2006.01) G01N 15/02 (2006.01)
Patent
CA 1159674
ABSTRACT OF DISCLOSURE A method and apparatus for determining the diameter of a particle in suspension in a fluid using coherent electromagnetic radiation is disclosed. A parallel beam of coherent electromagnetic radiation is directed towards the particle and the diffused radiation is collected in a predetermined direction. The diameter is defined by the ratio between the diameter of the particle in the predetermined direction and the incident radiation energy. The minimum angle of deviation between the axis of incident radiation and collection of diffused radiation so that there is one-to-one correspondence between the diffused energy and the diameter is determined. The radiation collecting angle is selected to be equal to or greater than the minimum angle. The incident beam is corrected,for example,by a first afocal system for enlarging the section of the beam and then correcting filter and a second afocal system for reducing the section to a suitable size. The diameters of particles which may be determined ranged between 0.5 and 200 micrometers, Simultaneous determination of particle velocity may also be provided.
371516
Gouesbet Gerard
Grehan Gerard
Rabasse Christiane
Agence Nationale de Valorisation de La Recherche (anvar)
Gowling Lafleur Henderson Llp
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