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Proceedings Paper

Light scattering in thermomechanical pulp (TMP) and talc measured with a time-of-flight (TOF) lidar
Author(s): Juha Saarela; Matti Toermaenen; Risto A. Myllylae
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Paper Abstract

This paper studies the correlation between the time-of-flight (TOF) of laser pulses and the talc content of pulp. Samples of thermomechanical pulp (TMP) and talc were made up with consistency values ranging from 0.0% to 3.0% and increasing by steps of 0.5%. The proportion of filler, in this case talc, in the TMP varied from 0% to 100%. Laser pulses were shot through the samples and changes in the attentation and TOF of the pulses were recorded. The results show that TOF increases as consistenscy increases. This indicates an increase in the number of scattering surfaces. An increase in the proportion of talc leads to a corresponding change in the TOF. This indicates that talc has a larger scattering surface than does TMP of equivalent mass. Varying consistencies and talc contents produced different points on the delay-attenuation axes. Consquently, the measurement of TOF and attenuation may be used to determine the consistency and proportion of talc.

Paper Details

Date Published: 3 April 2003
PDF: 8 pages
Proc. SPIE 5059, 12th International Workshop on Lidar Multiple Scattering Experiments, (3 April 2003); doi: 10.1117/12.512334
Show Author Affiliations
Juha Saarela, Univ. of Oulu (Finland)
Matti Toermaenen, Univ. of Oulu (Finland)
Risto A. Myllylae, Univ. of Oulu (Finland)


Published in SPIE Proceedings Vol. 5059:
12th International Workshop on Lidar Multiple Scattering Experiments
Christian Werner; Ulrich G. Oppel; Tom Rother, Editor(s)

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