Particle measurement method and apparatus for determining corrected particle diameter
Patent 5126581 Issued on June 30, 1992. Estimated Expiration Date: 
October 5, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 5, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3879129 Method of measuring concentration of substances Method and apparatus to determine the size and velocity of particles using light scatter detection from confocal beams Patent #: 4854705 InventorsAssigneeApplicationNo. 593108 filed on 10/05/1990US Classes:250/574, Scattered or reflected light356/336By particle light scatteringExaminersPrimary: Nelms, David C.Attorney, Agent or FirmInternational ClassG01N 015/06Foreign Application Priority Data1989-10-06 JPAbstractIn a particle measurement method and apparatus, a laser beam is directed into a fluid and the intensity of light scattered by fine particles floating in the fluid is detected by a light receiving system to determine the particle diameter. A ratio of light scattering efficiency of the particles in the fluid to that in a standard fluid is determined on the base of the refractive index of the fluid in use. The particle diameter is corrected depending upon the ratio of light scattering efficiency by correcting a set value for discriminating the particle diameter or by correcting the intensity of the detected scattered light. This compensates for errors arising from the difference of the refractive index of the fluid containing the particle to be measured and assures a high accuracy in measuring the particle size. | |
