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Proceedings Paper

Light scattering in paper measured with a time-of-flight lidar
Author(s): Juha Saarela; Risto A. Myllyla
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Paper Abstract

This paper studies the correlation between the time-of-flight (TOF) of laser pulses and paper density, basis weight, thickness and the beating of pulp. Paper samples made from unbeaten and beaten pulp were compressed from 500kg/m3 to 1100kg/m3 and laser pulses were shot through them during pressing. Changes were observed in the thickness of the samples and in the TOF of the laser pulses. The results show that TOF decreases during comrpession. This indicates that distances between the various scattering surfaces decrease. This phenomenon becomes more pronounced as the basis weight increases. The beating of the pulp before papermaking increases the number of scattering surfaces, thus broadening the laser pulse and causing delay. These two effects cannot be separated with the equipment used. Papers made from different pulp types each have unique delay constants.

Paper Details

Date Published: 8 August 2003
PDF: 7 pages
Proc. SPIE 5123, Advanced Optical Devices, Technologies, and Medical Applications, (8 August 2003); doi: 10.1117/12.517002
Show Author Affiliations
Juha Saarela, Univ. of Oulu (Finland)
Risto A. Myllyla, Univ. of Oulu (Finland)

Published in SPIE Proceedings Vol. 5123:
Advanced Optical Devices, Technologies, and Medical Applications
Janis Spigulis; Janis Teteris; Maris Ozolinsh; Andrejs Lusis, Editor(s)

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