Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1985-10-18
1987-03-17
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With light attenuation
356237, 356394, G01B 1124
Patent
active
046503340
ABSTRACT:
An apparatus and method for measuring the profile of a curvilinear surface is provided. The apparatus includes a light source for substantially uniformly delivering radiant energy along an illumination plane substantially tangent to the curvilinear surface. The delivered radiant energy is optically imaged at a first image plane. A first portion of the delivered radiant energy is blocked by an optical field stop having an accurately straight reference profile edge portion, and a second portion of the imaged radiant energy is focused on a transducer located at a second image plane. The transducer produces a coded data signal in response to the focused radiant energy. A microprocessor receives the coded data signal, determines the deviation of the profile of the curvilinear surface from the reference profile edge portion, and produces a straightness signal in response to the determined deviation. Nonuniformities of the apparatus are automatically compensated for. The apparatus is simple to operate and facilitates 100% inspection in a production environment.
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patent: 3470384 (1969-09-01), Bodnar et al.
patent: 3604940 (1971-09-01), Matthews
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patent: 3907438 (1975-09-01), Holeman
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patent: 3966332 (1976-06-01), Knapp et al.
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Acudata Electronic Crankshaft Journal Profile Gauge Data Sheet, copyrighted 1979 by Lion Precision Corporation.
Excerpt from Guideline for Reusable Parts, copyrighted by CTCo, in 1980.
Alster Louis G.
Gardner Chester S.
Caterpillar Inc.
Evans F. L.
Noe Stephen L.
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