Patent ID: 7780817

Claim:
A method for measuring in a direction across a moving web both tension and caliper of said moving web comprising: using a single sensor to measure tension and caliper of said moving web at a location on said moving web; providing support for said moving web before and after said location on said moving web where said single sensor measures tension and caliper of said moving web; controlling said single sensor to alternate between two operating modes where in one of said two operating modes said single sensor measures caliper of said moving web and in another of said two operating modes said single sensor measures tension of said moving web; and wherein said single sensor has first and second sensing planes on opposite sides of said moving web and said controlling said sensor to alternate between said two operating modes comprises extending in one of said two operating modes both said first and said second sensing planes to measure caliper of said moving web and extending in the other of said operating modes only said first sensing plane to measure tension of said moving web.