Method of inspecting a web of translucent material, especially p

Details Method of inspecting a web of translucent material, especially p Method of inspecting a web of translucent material, especially p

1991-12-06

1993-08-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356429, G01N 2186

Patent

active

052371816

ABSTRACT:
A method of visually inspecting the formation of a web of translucent material by means of a device it moves past. The device consists of a source of light on one side of the web generating a beam of light of a desired hue and intensity that penetrates the web, and a video camera on the side of the web away from the source of light, intercepting the beam and converting it into a video signal that is forwarded to a monitor. The source of light emits the beam in a flash of duration t.sub.1 that is too short for the web to advance far enough while illuminated to blur the image. The image on the monitor is accompanied by a reference image.

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