Optics: measuring and testing – For size of particles – By particle light scattering
Patent
1993-10-29
1994-12-20
Evans, F. L.
Optics: measuring and testing
For size of particles
By particle light scattering
356400, 356343, 250556, G01N 1502
Patent
active
053749898
ABSTRACT:
A method and apparatus for identifying an object having non-specific outer boundaries, such as a leukocyte, includes a device for tracking, in two dimensions, the position of the object to be identified. An identification device for identifying the object tracked by the device includes a coherent light beam emissions source, a lens assembly to direct the coherent light beam from the source to the object to be identified, a detection device for detecting the light beam which is transmitted through the object, the detection device provided with a plurality of circular or semicircular coaxial sections, the center of which is at the axis of the coherent light beam in the plane on which Fraunhofer's diffraction patterns are formed. Finally, an identification apparatus is provided which uses the output of the detection device to provide various characteristic parameters which are utilized to identify the object.
REFERENCES:
patent: 5315115 (1994-05-01), Gerber et al.
Takemura Yasuhiro
Takesue Toshiharu
Evans F. L.
Kim Robert
Sumitomo Cement Co. Ltd.
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