Method and means for the determination of a planar dimension

Details Method and means for the determination of a planar dimension Method and means for the determination of a planar dimension

1976-04-13

1978-01-10

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250560, 356167, G01B 1104

Patent

active

040676528

ABSTRACT:
In measuring the width of rolled stock, a photo-sensitive diode array overlying an edge of the stock is scanned to provide an indication of the position of the edge of the stock, the outputs of the diodes appearing serially to provide a waveform. To find the step in this waveform which represents the edge, the waveform is filtered to replace falling edges by shallow slopes and rising edges are detected in a peak rectifier/capacitor arrangement which can only discharge slowly. An output comparator is triggered in each cycle (except the first) by any rising edge signal which causes charging of the peak storage capacitor. The output comparator signal indicates the position in the scanning cycle of the article edge.

REFERENCES:
patent: 3694658 (1972-09-01), Waston et al.
patent: 3874798 (1975-04-01), Antonsson et al.

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