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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 8 — Apr. 17, 2006
  • pp: 3641–3653

Spectroscopic studies of wood-drying processes

Mats Andersson, Linda Persson, Mikael Sjöholm, and Sune Svanberg  »View Author Affiliations


Optics Express, Vol. 14, Issue 8, pp. 3641-3653 (2006)
http://dx.doi.org/10.1364/OE.14.003641


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Abstract

By the use of wavelength-modulation diode laser spectroscopy, water vapor and oxygen are detected in scattering media nonintrusively, at 980 nm and 760 nm, respectively. The technique demonstrated is based on the fact that free gases have extremely sharp absorption structures in comparison with the broad features of bulk material. Water vapor and oxygen measurements have been performed during the drying process of wood. The results suggest that the demonstrated technique can give information about the drying process of wood to complement that of commercially available moisture meters. In particular, the time when all the free water has evaporated from the wood can be readily identified by a strong falloff in the water vapor signal accompanied by the reaching of a high-level plateau in the molecular oxygen signal. Furthermore, the same point is identified in the differential optical absorption signal for liquid water, with a sharp increase by an order of magnitude in the ratio of the signal intensities at 980 nm and 760 nm.

© 2006 Optical Society of America

OCIS Codes
(000.2190) General : Experimental physics
(290.7050) Scattering : Turbid media
(300.6260) Spectroscopy : Spectroscopy, diode lasers

ToC Category:
Spectroscopy

History
Original Manuscript: February 3, 2006
Revised Manuscript: March 28, 2006
Manuscript Accepted: April 3, 2006
Published: April 17, 2006

Virtual Issues
Vol. 1, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Mats Andersson, Linda Persson, Mikael Sjöholm, and Sune Svanberg, "Spectroscopic studies of wood-drying processes," Opt. Express 14, 3641-3653 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-8-3641


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