Light scattering in thermomechanical pulp (TMP) and talc measured with a time-of-flight (TOF) lidar

Juha Saarela; Matti Toermaenen; Risto A. Myllylae

doi:10.1117/12.512334

3 April 2003 Light scattering in thermomechanical pulp (TMP) and talc measured with a time-of-flight (TOF) lidar

Juha Saarela, Matti Toermaenen, Risto A. Myllylae

Author Affiliations +

Proceedings Volume 5059, 12th International Workshop on Lidar Multiple Scattering Experiments; (2003) https://doi.org/10.1117/12.512334
Event: 12th International Workshop on Lidar Multiple Scattering Experiments, 2002, Oberpfaffenhofen, Germany

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.

Citation Download Citation

Juha Saarela, Matti Toermaenen, and Risto A. Myllylae "Light scattering in thermomechanical pulp (TMP) and talc measured with a time-of-flight (TOF) lidar", Proc. SPIE 5059, 12th International Workshop on Lidar Multiple Scattering Experiments, (3 April 2003); https://doi.org/10.1117/12.512334

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KEYWORDS

Talc

LIDAR

Light scattering

Signal attenuation

Particles

Scattering

Pulsed laser operation

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