Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1987-06-15
1989-06-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356239, G01N 904
Patent
active
048411396
ABSTRACT:
A method for testing components of transparent material for surface irregularities and occlusions, comprising the steps of dot-scanning the component by moving a light ray completely therethrough; detecting the light which represents flaws in at least the front and back surfaces of the component by receivers located on one side of the component; generating fault signals based on the light detected in the detecting step; digitizing the fault signals which are generated in the generating step; feeding the digitized signal to a mapped memory; and analyzing the signal by: (a) feeding the digitized signal to a number of sector counters via a preselectable number of thresholds; (b) evaluating the sector counters on-line according to preselected criterion regarding the number, location and gray tone distribution of the digitized fault signals; and (c) evaluating the signals in the mapped memory in a computer if the fulfillment of the criterion for evaluation of the sector counters cannot be sufficiently assured.
REFERENCES:
patent: 3964830 (1976-06-01), Ikdea et al.
patent: 3977789 (1976-08-01), Hunter et al.
patent: 3988068 (1976-10-01), Sprague
Kurpiella Hubert
Schmalfuss Harald
Schneider Bernhard
Battelle-Institut e.V.
Nelms David C.
Shami Khaled
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