Device for determining location of apertures

Details Device for determining location of apertures Device for determining location of apertures

1990-02-23

1990-12-25

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356375, G01N 2184

Patent

active

049805703

ABSTRACT:
The location of an aperture surrounded by a region of different brightness on a plane surface is achieved by line scanning the surface with an optical scanner while shifting the line position stepwise in an orthogonal direction. A change in brightness as the scanner passes between the region and aperture creates in the scanning signals, a pulse indication of the aperture position. Signals for a progressively changing group of successive scanning lines large enough in number to span a given aperture on either side in the orthogonal direction and include a signal for at least one line intersecting the aperture; i.e., three or more consecutive lines, are synchronously compared by time delaying the earlier signals to coincide with the real time signal. The coincidence of one or more line signals indicative of an aperture directly preceded and followed by a line signal free of an aperture indication signifies the presence of an aperture. The aperture indication can be timed to give the X-axis and X-axis coordinates therefor. The aperture indication signal is checked for abnormalities before being accepted.

REFERENCES:
patent: 4711579 (1987-12-01), Wilkinson

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