Reflector for the laser beam of a particle analyzer

Details Reflector for the laser beam of a particle analyzer Reflector for the laser beam of a particle analyzer

1979-01-24

1981-08-04

Evans, F. L.

Optics: measuring and testing

For optical fiber or waveguide inspection

250461B, 356318, 356338, G01N 2149, G01N 2164

Patent

active

042819245

ABSTRACT:
An apparatus and method for illuminating particles, wherein a source of illumination provides a beam of illuminating radiation which perpendicularly intersects a stream of liquid having the particles suspended therein. The illuminator apparatus comprises a concave reflector surface having a center of curvature and an optical axis which is disposed perpendicularly relative to the stream and with the beam being positioned thereon. The stream of liquid defines a cylindrical lens having a focus positioned at the center of curvature. In operation, the illuminating radiation illuminates the particles, is refracted by the stream so as to converge to a focus, passes from that focus to a concave reflector surface, and reflects from the concave reflector surface back to the focus, so as to impinge upon the stream for a second time, to further illuminate the particles.

REFERENCES:
patent: 3398286 (1968-08-01), Ford et al.
patent: 3704951 (1972-12-01), Chupp
patent: 3807862 (1974-04-01), Hatzenbuhler
patent: 4022529 (1977-05-01), White
patent: 4127329 (1978-11-01), Chang et al.

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