Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1976-09-08
1978-01-03
Corbin, John K.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
2091117T, 250223B, 356240, G01N 2132
Patent
active
040663639
ABSTRACT:
An apparatus and method for inspecting the side wall of a glass container for ribbon tear defects wherein the container is rotated past a detector assembly. Two pairs of photovoltaic devices mounted in the detector assembly in a vertical line parallel to the vertical axis of the container respond to the light transmitted through the side wall of the container from a light source focused on the interior of the container. Each cell output signal is logarithmically amplified and filtered to remove the d.c. component thereby eliminating differences in magnitudes between the signals not caused by the detection of a seam or a defect. Each cell output signal is then compared with each of four reference signal levels corresponding to severe, normal and small changes in the signal level, the latter level being further divided into light focusing and light scattering changes. The comparison output signals are the inputs to logic circuits for distinguishing among seams, minor defects and ribbon tear defects by determining if the signals satisfy at least two of four conditions. The first condition, which always must be satisfied, is that either one of the pairs of cells has made a detection at at least the normal reference signal level. The other conditions include a second detection within 150.degree. of container rotation from the first detection or a detection of at least a predetermined width or a detection wherein the two pairs of cells do not detect simultaneously but may both detect within a predetermined distance of one another. If a ribbon tear defect is detected, the logic circuit will generate a signal to an associated inspection machine to reject the container.
REFERENCES:
patent: 3313409 (1967-04-01), Johnson
patent: 3439178 (1969-04-01), Rottmann
patent: 3533704 (1970-10-01), Krenmayr
patent: 3880750 (1975-04-01), Butler et al.
patent: 3923158 (1975-12-01), Fornaa
Corbin John K.
Innis D. T.
Owens--Illinois, Inc.
Rosenberger R. A.
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