Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1985-10-15
1988-03-01
Laroche, Eugene R.
Optics: measuring and testing
For size of particles
By particle light scattering
356338, 250574, G01N 2100
Patent
active
047281901
ABSTRACT:
A device and method are disclosed for optically detecting particles in a fluid. A fluid passage with transparent walls defining a monitoring volume, or region, is provided, and particles in the fluid are optically detected by directing a laser beam through the fluid in the monitoring region and collecting light scattered by the particles. A capillary is utilized as the fluid passage, and reflections from the walls of the capillary are effectively precluded. The laser beam is directed through the capillary by means of a window at the entrance side and a lens at the collecting side with the air-glass interfaces being outside the depth of view of particle monitoring within the monitoring region. As a result of this arrangement, the amount of scattered light is greatly reduced and a more uniform light signal is achieved which results in better size resolution of particles than has heretofore been achieved.
REFERENCES:
patent: 4616927 (1986-10-01), Phillips et al.
"`In Situ` Optical Particle Size Measurements In Liquid Media" by Robert G. Knollenberg, Proceedings of Pure Water Conference, Palo Alto, Calif., Jan. 13-14, 1983.
Harris Robert E.
LaRoche Eugene R.
Particle Measuring Systems, Inc.
Pascal Robert J.
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