Adaptive coherent optical processing method and apparatus for re

Details Adaptive coherent optical processing method and apparatus for re Adaptive coherent optical processing method and apparatus for re

1977-01-21

1979-02-13

Corbin, John K.

Optics: measuring and testing

Blood analysis

3401463CA, 356 71, 356336, G01N 3316, G01N 1502, G01N 2100

Patent

active

041393031

ABSTRACT:
Recognizing and counting geometrically distant objects, such as objects of a particular morphological type (e.g., reticulated red blood cells), located in a field of objects of varying types is disclosed. Coherent light is directed toward a monolayer of objects of various types. The light scattered by the objects is collected by a collecting lens and forms a composite Fourier spectrum at the focal plane of the lens. The Fourier spectrum is selectively analyzed on the basis that each object creates a unique portion of the composite Fourier spectrum, and that a family of objects that are geometrically similar have additive spectrums, when their population is large, randomly located, and nonoverlapping. The analysis is performed by making intensity measurements at radial points in the Fourier plane, weighting the measurements, and summing the result. The radial points and weighting factors are determined using regression techniques.

REFERENCES:
patent: 3469921 (1969-09-01), Taylor
patent: 3830569 (1974-08-01), Meric
patent: 3947123 (1976-03-01), Carlson et al.
Anderson et al., "Counting & Classifying Small Objects by Far-Field Light Scattering", Applied Optics, 7-1971, pp. 1503-1508.

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