Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1976-04-16
1978-05-02
McGraw, Vincent P.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
250223B, 250227, 356240, G01N 2124
Patent
active
040871843
ABSTRACT:
A method and apparatus for automatically inspecting liquid filled containers for particulate contaminants in relative size. The method comprising the steps of illuminating the liquid with a constant intensity light source, imaging the entire illuminated liquid volume, including the meniscus, into a plurality of image planes with fiber optic bundles, and monitoring the fiber optic bundles with an array of constant sensitivity photo transducers. Each photo transducer continually translates the illumination value of the vial image of an assigned and separate unit volume of the liquid-filled container into a voltage signal and each signal is monitored for a signal change indicative of particulate movement. The interfering output signal due to the meniscus decay is corrected, and the accept/reject decision is based upon a composite signal representative of all the differentiated signals received from the array of photo transducers.
REFERENCES:
patent: 2531529 (1950-11-01), Price
patent: 3356854 (1967-12-01), Humphrey
patent: 3966332 (1976-06-01), Knapp et al.
Knapp Julius Z.
Zeiss John C.
Coan Stephen B.
Eisen Bruce M.
Gifford Vincent H.
McGraw Vincent P.
Schering Corporation
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