Apparatus for optically scanning a web of material

Details Apparatus for optically scanning a web of material Apparatus for optically scanning a web of material

1986-08-15

1989-09-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356431, G01N 2188

Patent

active

048662887

ABSTRACT:
The sharply bounded entry pupil (13) of an optical web monitoring apparatus is imaged by the system after passage through or reflection at the material web onto a dark field stop (16). This stop is provided at its periphery with light receiving surfaces having a relatively small area relative to the extent of the dark field stop (16). These light receiving surfaces conduct the received light to a photoconverter arrangement which is connected to an electronic processing circuit. In this way material faults are detected which bring about only small angular deviations of the scanning beam. In order to detect faults with greater light scattering a multiplier (23) is additionally mounted behind this receiver arrangement and receives light deflected beyond the light receiving surfaces.

REFERENCES:
patent: 3854587 (1974-12-01), McLoughlin et al.
patent: 4118127 (1978-10-01), Klein et al.
patent: 4409477 (1983-10-01), Carl

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