Depth measurement of moving slurry at the wet end of a paper machine

James S. Goddard, Hamed Sari-Sarraf, John C. Turner, Martin A. Hunt, Besma R. Abidi

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


The paper industry has long had a need to better understand and control its papermaking process upstream, specifically at the wet end in the forming section of a paper machine. A vision-based system is under development that addresses this need by automatically measuring and interpreting the pertinent paper web parameters at the wet end in real time. The wet-end characterization of the paper web by a vision system involves a four-dimensional measurement of the slurry in real time. These measurements include the two-dimensional spatial information, the intensity profile, and the depth profile. This paper describes the real-time depth profile measurement system for the high-speed moving slurry. A laser line-based measurement method is used with a high-speed programmable camera to directly measure slurry height. The camera is programmed with a profile algorithm, producing depth data at fast sampling rates. Analysis and experimentation have been conducted to optimize the system for the characteristics of the slurry and laser line image. On-line experimental results are presented.

Original languageEnglish
Pages (from-to)21-27
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1999
EventProceedings of the 1999 7th SPIE Conference on Machine Vision Applications in Industrial Inspection VII - San Jose, CA, USA
Duration: Jan 25 1999Jan 26 1999


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