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Spectroscopic studies of wood-drying processes

Andersson, Mats LU ; Persson, Linda LU ; Sjöholm, Mikael LU and Svanberg, Sune LU (2006) In Optics Express 14(8). p.3641-3653
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Express
volume
14
issue
8
pages
3641 - 3653
publisher
OSA
external identifiers
  • wos:000237144700061
  • scopus:33645805236
ISSN
1094-4087
language
English
LU publication?
yes
id
647d0c15-2615-4389-acb4-55a081057aa4 (old id 410331)
alternative location
http://www.opticsinfobase.org/abstract.cfm?URI=oe-14-8-3641
date added to LUP
2007-09-25 09:46:52
date last changed
2019-04-10 02:52:09
@article{647d0c15-2615-4389-acb4-55a081057aa4,
  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.},
  author       = {Andersson, Mats and Persson, Linda and Sjöholm, Mikael and Svanberg, Sune},
  issn         = {1094-4087},
  language     = {eng},
  number       = {8},
  pages        = {3641--3653},
  publisher    = {OSA},
  series       = {Optics Express},
  title        = {Spectroscopic studies of wood-drying processes},
  volume       = {14},
  year         = {2006},
}