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:
Aug. 27, 1985
Filed:
Oct. 18, 1982
Cecil Hess, Irvine, CA (US);
Spectron Development Laboratories, Inc., Costa Mesa, CA (US);
Abstract
An apparatus and method for determining the size and velocity of particles, droplets and the like is disclosed. Laser beams of the same wavelength having different diameters are caused to cross and form an interference pattern. The scattered light caused by particles, droplets or the like passing through the interference pattern is sensed by a collection means. The scattered signal is passed through a high pass filtering means to isolate Doppler (AC) components, and a low pass filtering means to isolate a DC pedestal signal. The AC signal is processed to provide the velocity, and the DC signal is processed to provide the size of the particle, droplet or the like. The position of the AC Doppler components in the scattered signal indicates the position of the particle in the cross-section of the larger diameter beam.