Web caliper measuring system

Details Web caliper measuring system Web caliper measuring system

G - Physics

01

B

G01B 21/08 (2006.01) G01B 7/06 (2006.01) G01B 11/06 (2006.01)

Patent

CA 2356337

A non-contacting thickness measurement apparatus is described, which is capable of on-line, highly accurate web thickness measurements. The apparatus is comprised of a first and second distance determining means which calculate a distance value from each distance determining means to the web surface. The distance determining means are on opposite sides of the web, so each measures the distance to a different side of the web. At the same time, the distance between the two distance determining means is measured to produce a z-sensor spacing value. The two distance values are thereafter subtracted from the z-sensor spacing value to get a web thickness value. An x-y position adjustment means is used to keep the measurement spot on the web for the two distance determining means at the same location on the web, and several techniques are combined to eliminate temperature-induced and/or other unknown variations or drifts in the web thickness value which are not caused by actual changes in the thickness of the web.

L'invention porte sur un appareil de mesure d'épaisseur sans contact permettant des mesures en ligne de haute précision de l'épaisseur d'une bande. L'appareil comprend un premier et un deuxième télémètre disposés de part et d'autre de la bande et mesurant chacun la distance les séparant de la surface de la bande. On mesure par ailleurs la distance séparant les deux télémètres ce qui donne l'espacement en Z des télémètres dont on soustrait ensuite les distances respectives des télémètres à la bande pour obtenir l'épaisseur de la bande. Il est également prévu un moyen de réglage en X et en Y maintenant les deux spots de mesure des deux télémètres en coïncidence, ainsi que plusieurs techniques combinées pour éliminer les variations dues à la température ou d'autres variations ou dérives non connues de l'épaisseur de la bande non dues aux variations effectives de l'épaisseur de la bande.

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