Two-sided laser device for online paper caliper measurement and control

Michael K. Y. Hughes; Markus Bengtsson; Pak Hui; Graham Duck

doi:10.1117/12.827489

17 June 2009 Two-sided laser device for online paper caliper measurement and control

Michael K. Y. Hughes, Markus Bengtsson, Pak Hui, Graham Duck

Proceedings Volume 7389, Optical Measurement Systems for Industrial Inspection VI; 73891Z (2009) https://doi.org/10.1117/12.827489
Event: SPIE Europe Optical Metrology, 2009, Munich, Germany

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.

Citation Download Citation

Michael K. Y. Hughes, Markus Bengtsson, Pak Hui, and Graham Duck "Two-sided laser device for online paper caliper measurement and control", Proc. SPIE 7389, Optical Measurement Systems for Industrial Inspection VI, 73891Z (17 June 2009); https://doi.org/10.1117/12.827489

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