Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1996-07-30
1998-02-17
Font, Frank G.
Optics: measuring and testing
For optical fiber or waveguide inspection
356338, 356343, 356442, 356436, G01N 2100
Patent
active
057196672
ABSTRACT:
An optical illuminator assembly for an analytical instrument, such as a clinical hematology or a flow cytometer instrument, including a laser diode having a diverging laser beam output, a collimating lens to collimate the diverging laser beam, a spatial filter operating on the collimated laser beam to spatially filter the beam, and a focussing lens to focus the spatially filtered beam into a flow cell containing particles suspended in a moving stream. A beam shaping aperture is preferably inserted between the spatial filter and the focussing lens to shape the laser beam. The spatial filter preferably includes an objective lens, a collimating lens, and a filter aperture interposed between the objective and imaging lenses. The filter aperture is preferably rectangular, having a height to width ratio in the range of 1:2 to 1:3 such that each dimension is on the order of tens of micrometers. The beam shaping aperture is preferably a rectangular aperture having a height to width ratio in a range of from 3:1 to 5:1 such that each dimension is on the order of hundreds of micrometers.
REFERENCES:
patent: 3637293 (1972-01-01), Lohmann
patent: 3642350 (1972-02-01), Hirsch et al.
patent: 3703641 (1972-11-01), Rosen
patent: 4053229 (1977-10-01), McCluney
patent: 5039855 (1991-08-01), Kemeny et al.
Bayer Corporation
Font Frank G.
Vierra-Eisenberg Jason D.
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