On-line texture sensing

Details On-line texture sensing On-line texture sensing

G - Physics

01

N

354/126, 352/10.

G01N 21/86 (2006.01) G01N 21/89 (2006.01) G01N 33/34 (2006.01) G01N 21/21 (2006.01)

Patent

CA 1310128

ON-LINE TEXTURE SENSING The texture of a travelling web is determined by instantaneously illuminating an area of the web via a strobe light and photographing the illuminated area by a video camera correlated to operate in conjunction with the strobe. The signal from the camera is digitized, histogrammed and analyzed to determine the characteristics of the web. The strobe light may direct the light through the web or at an angle to the web and the video camera depending on the characteristics to be determined may be positioned to receive specularly reflected light from the web or reflected light or positioned on the opposite side of the web to receive light transmitted through the web. In one embodiment the light is polarized and directed at Brewster's angle onto the surface of the web and only similarly polarized specularly reflected light is received by the camera.

596614

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