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Proceedings Paper

Real-time pressure monitoring for dynamic control during paper mill operation using fiber optic pressure sensors
Author(s): Robert S. Fielder; Clark Boyd; Matthew Palmer; Oddbjørn Eriksen
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Paper Abstract

Fiber optic pressure sensors were integrated into the grinding plates of an operational paper pulp mill for real-time monitoring of the pulp grinding process. On-line system monitoring will allow smart, active control of the grinding plates thereby improving the quality and consistency of the pulp produced. Sensors were constructed and calibrated for use in the harsh environment of an operating paper pulp grinder. The sensors were 1.65mm in diameter including titanium housing, and were installed directly into the grooves of the grinding plates. The sensing elements were flush-mounted with the wall and exposed to the wood pulp slurry. Nine sensors were calibrated up to 1000psi. During operation, pressure was sampled at 1.0MHz, and pressure spikes up to 175psi were observed. Pressure pulses measured are due to the relative motion between the grooves and channels on two pulp grinding plates. The consistency, size distribution, and quality of paper pulp exiting from the grinder are directly related to the distance between the channels on the two rotating elements. The pressure pulses produced are also proportional to the distance between channels. Therefore, by monitoring pressure fluctuations, grinding elements can be dynamically controlled thereby producing a "smart mill."

Paper Details

Date Published: 30 March 2006
PDF: 11 pages
Proc. SPIE 6171, Smart Structures and Materials 2006: Industrial and Commercial Applications of Smart Structures Technologies, 61710B (30 March 2006); doi: 10.1117/12.658463
Show Author Affiliations
Robert S. Fielder, Luna Innovations, Inc. (United States)
Clark Boyd, Luna Innovations, Inc. (United States)
Matthew Palmer, Luna Innovations, Inc. (United States)
Oddbjørn Eriksen, Paper and Fibre Research Institute (Norway)

Published in SPIE Proceedings Vol. 6171:
Smart Structures and Materials 2006: Industrial and Commercial Applications of Smart Structures Technologies
Edward V. White, Editor(s)

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