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Proceedings Paper

Photon migration in highly scattering and low-absorbing media during compression measured with a streak-camera
Author(s): T. Fabritius; J. Saarela; R. Myllylä
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Paper Abstract

Paper samples with a grammage between 50-200 g/m2 were compressed from 313 to 1105 kg/m3. During pressing, laser pulses were shot through them and delays in pulse propagation and light transmission in the compressed paper were observed with a streak-camera. The results show that the transmitted intensity depends mainly on the paper's grammage and is inversely proportional to it. Contrary to earlier TOF lidar measurements conducted during compression, delays in the propagation of photons decreased in paper samples with a grammage smaller than 280 g/m2. This result suggests that there is a grammage limitation at about 100 g/m2. When a streak-camera is used it allows the transmittance and propagation delay of photons to be obtained concurrently. As a result, changes in grammage and thickness can be evaluated separately. In addition, the paper presents a light transmittance and propagation delay dependent equation for porosity.

Paper Details

Date Published: 7 July 2006
PDF: 7 pages
Proc. SPIE 6164, Saratov Fall Meeting 2005: Coherent Optics of Ordered and Random Media VI, 61640E (7 July 2006); doi: 10.1117/12.695019
Show Author Affiliations
T. Fabritius, Univ. of Oulu (Finland)
J. Saarela, Univ. of Oulu (Finland)
R. Myllylä, Univ. of Oulu (Finland)

Published in SPIE Proceedings Vol. 6164:
Saratov Fall Meeting 2005: Coherent Optics of Ordered and Random Media VI
Dmitry A. Zimnyakov; Nikolai G. Khlebtsov, Editor(s)

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