Optics: measuring and testing – By particle light scattering
Reexamination Certificate
2005-02-22
2005-02-22
Smith, Zandra (Department: 2877)
Optics: measuring and testing
By particle light scattering
C356S338000
Reexamination Certificate
active
06859277
ABSTRACT:
A fluid particle counter comprising an inlet jet tip producing an air flow, a strip laser diode producing a laser beam, and a beam shaping system that includes an aspheric collimating lens, an achromatic spherical lens, a cylinder lens, and a series of cascading apertures. A retarder rotates the polarization so that the TE mode is along the direction of fluid flow. The optical system is designed so that along the flow axis the laser beam is single mode, while the multimodes due to the strip laser are constrained to the dimension perpendicular to the flow. The beam is pinched to a 35 micron waist and has a Gaussian profile along the flow direction which permits locating the beam within 3.5 mm of the flow tip while preventing stray light scattering from the tip. The beam profile along the axis perpendicular to the flow is closer to a square wave than a Gaussian. The particle counter output is substantially free of all noise except noise created by light scattered from molecules of the fluid, even for volumetric particle counters.
REFERENCES:
patent: 4596464 (1986-06-01), Hoffman et al.
patent: 5092675 (1992-03-01), Sommer
patent: 5282151 (1994-01-01), Knollenberg
patent: 5402438 (1995-03-01), Tanuma
patent: 6628386 (2003-09-01), Davis et al.
patent: WO 0127686 (2001-04-01), None
Bates Thomas
Wagner Gregg A.
Geisel Kara
Particle Measuring Systems, Inc.
Patton & Boggs LLP
Smith Zandra
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