Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1979-03-22
1981-11-10
Corbin, John K.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 71, 356239, G02B 2738, G01N 2100
Patent
active
042994438
ABSTRACT:
An apparatus for detecting the defects composed of non-linear components of a subject pattern, includes a laser source for illuminating the subject pattern by a laser beam, a Fourier-transform lens for projecting an information light from the pattern through a spatial filter onto a screen. The filter is placed on the Fourier-transform plane of the Fourier-transformed information light for intercepting the coherent light having information on linear components, the filter having arm sections extending correspondingly to the linear components of said normal pattern, the outer periphery of said arm sections including curved sections of a circular or elliptical shape protruding toward the intersecting point of the arms.
REFERENCES:
patent: 3560093 (1971-02-01), Montone
patent: 3614232 (1971-10-01), Mathisen
patent: 3658420 (1972-04-01), Axelrod
patent: 3743423 (1973-07-01), Heinz et al.
patent: 3813173 (1974-05-01), Teter
patent: 3972616 (1976-08-01), Minami et al.
Minami Masana
Sekizawa Hidekazu
Arnold Bruce Y.
Corbin John K.
Tokyo Shibaura Electric Co. Ltd.
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