Method and system for broad area field inspection of a moving we

Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet

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356430, G01N 2186

Patent

active

052568830

ABSTRACT:
Information is received from an image on a moving substrate. Flash exposure is used, defining operating or exposure cycles. The reflection or a representation of the image is subdivided into a matrix having n columns and m rows or lines. The sensor is a charge coupled device (CCD), arranged to have a sensing area (11) with n columns and m rows or lines, and a storage region or section (12), likewise arranged to have storage cells of n and m columns and rows or lines. Information of any one image element, upon sensing, is shifted by a line transfer pulse by one image line. The line transfer pulses are synchronized with web movement of the substrate and operate as shift pulses. The m line, at the first transfer line shift pulse, is shifted into the first line or row of the matrix of the storage portion of the CCD. For each operating cycle, at least one line transfer pulse is used. The information of the image elements can be read out serially from the storage portion (12) at high speed. The storage portion of the CCD chip is protected against exposure to light.

REFERENCES:
patent: 4100424 (1978-07-01), Akimoto et al.
patent: 4488808 (1984-12-01), Kato
patent: 4555180 (1985-11-01), Masuda et al.
patent: 4644174 (1987-02-01), Ouellette et al.
SMPTE Journal, May 1988, pp. 378-387.

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