Optics: measuring and testing – By particle light scattering – With photocell detection
Reexamination Certificate
2005-07-26
2005-07-26
Pham, Hoa Q. (Department: 2877)
Optics: measuring and testing
By particle light scattering
With photocell detection
C356S340000, C356S342000, C422S082050, C422S082090, C436S164000
Reexamination Certificate
active
06922241
ABSTRACT:
Apparatus for detecting light scattered by a small particle (e.g., a blood cell) irradiated by a light beam comprises one or more photodetectors and a plurality of optical fibers that serve to optically couple the scattered light and the photodetector(s). To enhance the efficiency of such optical coupling, a portion of each of the optical fibers in the vicinity of its light-collecting end is supported so that its optical axis extends towards the light-scattering source. By this arrangement, scattered light enters each fiber from a direction substantially parallel to the fiber axis. Preferably, the light-collecting ends of the optical fibers are supported on a concave surface and so that the respective optical axes of the fibers converge at a point representing the apparent position of the light-scattering source, taking into account the refractive effects of an optical flow cell through which scattering is detected. Preferably, both forward- and back-scattered light are detected by the apparatus of the invention.
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Alter Mitchell E.
Coulter International Corp.
Kurz Warren W.
Pham Hoa Q.
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