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Proceedings Paper

Two-sided laser device for online paper caliper measurement and control
Author(s): Michael K. Y. Hughes; Markus Bengtsson; Pak Hui; Graham Duck
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Paper Abstract

Strong demand exists for a non-contacting paper caliper measurement which can be used as an input to a paper thickness control system. Caliper sensors requiring sheet contact suffer from errors related to dirt or coating build up and from high maintenance costs related to wear. These sensors can also damage the product by picking holes and marking sheets. Details of an on-line measurement device which employs two opposed laser displacement sensors and an inductive displacement sensor are presented. The sheet is held perpendicularly to the sensors with a Coanda air clamp. Dust and temperature control features which enable the sensor to operate reliably in an industrial environment are discussed. Results of production trials of this sensor are presented. Sub-micron profile agreement to lab and contacting caliper measurements has been demonstrated on light sheets. Results are presented of measurements on a wide range of paper grades from coated and uncoated light sheets to coated board.

Paper Details

Date Published: 17 June 2009
PDF: 12 pages
Proc. SPIE 7389, Optical Measurement Systems for Industrial Inspection VI, 73891Z (17 June 2009); doi: 10.1117/12.827489
Show Author Affiliations
Michael K. Y. Hughes, Honeywell Process Solutions (Canada)
Markus Bengtsson, Honeywell Process Solutions (Sweden)
Pak Hui, Honeywell Process Solutions (Canada)
Graham Duck, Honeywell Process Solutions (Canada)

Published in SPIE Proceedings Vol. 7389:
Optical Measurement Systems for Industrial Inspection VI
Peter H. Lehmann, Editor(s)

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