The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 01, 1988
Filed:
Oct. 15, 1985
Robert G Knollenberg, Boulder, CO (US);
Particle Measuring Systems, Inc., Boulder, CO (US);
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.