Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1976-04-29
1978-05-09
Sacher, Paul A.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
250560, G01B 1104
Patent
active
040884112
ABSTRACT:
Apparatus for measuring the length of each of a series of continuously advancing and non-transparent articles, each article possessing an actual length L distributed about a predetermined or nominal length L.sub.o. In one embodiment the apparatus comprises two radiation/sensor pairs spaced apart by the nominal length L.sub.o. The radiation/sensor pairs are positioned along an axis parallel to the direction of article advancement. One radiation/sensor pair acts as a trigger to indicate when either the leading or trailing edge of the advancing article reaches a predetermined position, at which time the signal developed from the remaining radiation/sensor pair is memorized or recorded. This memorized voltage is an indication of the position of the leading or trailing edge of the advancing article and thus is a measure of the article's actual length. Disclosed apparatus includes a circuit to compensate for the effects of temperature variations, component drift, etc.
REFERENCES:
patent: 2730006 (1956-01-01), Gottschall
patent: 3060791 (1962-10-01), Tarczy-Hornoch
patent: 3365699 (1968-01-01), Foster
patent: 3710128 (1973-01-01), Kubisiak
Ahlquist Gary W.
Milley Michael K.
Eastman Kodak Company
Gremban S. W.
Punter Wm. H.
Sacher Paul A.
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