公开(公告)号：US06538743B2

公开(公告)日：2003-03-25

申请号：US09997714

申请日：2001-11-29

Applicant: John Shakespeare ,  Markku Mänty ,  Matti Kukkurainen

Inventor： John Shakespeare ,  Markku Mänty ,  Matti Kukkurainen

IPC: G01N2184

CPC classification number: G01N21/89 ,  G01N21/86 ,  G01N2291/044

Abstract: A method and an apparatus for measuring properties of a paper web, whereby at least one property of the paper web is measured at least at two locations in the cross direction of the paper web simultaneously. Adjacent measuring devices are calibrated by traversing a reference sample in the cross direction such that the reference sample is impinged by the measuring beam from each of the measuring devices.