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

Autor:	Markus Bengtsson, Pak Hui, Michael Kon Yew Hughes, Graham I. Duck
Rok vydání:	2009
Předmět:	Engineering Temperature control business.industry Acoustics Electrical engineering engineering.material Laser Displacement (vector) law.invention symbols.namesake Coating law Control system symbols Perpendicular Calipers business Coandă effect
Zdroj:	SPIE Proceedings.
ISSN:	0277-786X
DOI:	10.1117/12.827489
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bffc219cc2de9d673d4e4e29b319f4c0 https://doi.org/10.1117/12.827489 Zobrazit plný text záznamu