Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-04-15
1985-02-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250560, 356384, G01N 2186
Patent
active
044993838
ABSTRACT:
A method of determining the precise location of an edge of a strip with individual elements of a radiation responsive sensor to an accuracy exceeding the pitch of the elements is disclosed. The strip is scanned at least in the region of the edge with the individual elements of the radiation responsive sensor. Each element generates a signal value associated therewith for each scan and the signal values for all the elements form a composite signal having discrete values representative of radiation received form the scanned region at respective locations corresponding to the individual elements of the sensor. A region of interest where said edge is likely to lie is identified and the composite signal is analysed by defining a curve which when the values are plotted against the locations on a distance scale passes through the values to represent a radiation profile of the scanned region as received by the sensor. The point of maximum slope on the curve is then found and the corresponding position on the distance scale taken as representing the precise location of the edge.
REFERENCES:
patent: 2659823 (1953-11-01), Vossberg, Jr.
patent: 3907439 (1975-09-01), Zanoni
patent: 4033697 (1977-07-01), Pfoutz et al.
Austin II Ernest
European Electronic Systems Ltd.
Nelms David C.
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