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:
Sep. 29, 1998
Filed:
Jan. 02, 1997
Harbans S Dhadwal, Setauket, NY (US);
The Research Foundation of State University of New York, Albany, NY (US);
Abstract
An apparatus for determining the size or other physical properties of particles executing Brownian motion is provided. An integrated fiber optic probe, including a length of a gradient index multimode optical fiber fusion spliced to a monomode optical fiber, delivers laser light to a scattering medium such that the light scattered in the backward direction is collected by another integrated fiber optic probe mounted into the same cylindrical housing. A step index fiber may be fusion spliced between the monomode and gradient index multimode fibers. The axes of the fibers may be collinear or offset. The scattered light, after conversion to a series of photoelectron pulses, is processed to determine the mean particle diameter. The temporal coherence of the scattered field from submicroscopic particles illuminated by laser light is a function of both the integration time and the particle diameter. The temporal degree of coherence of the time averaged scattered intensity decreases as the integration time increases. Statistical processing of the scattered photons leads to a new method of particle sizing, which circumvents the need for digital autocorrelation.