Spectroscopic studies of wood-drying processes

Andersson, Mats; Persson, Linda; Sjöholm, Mikael; Svanberg, Sune

doi:10.1364/oe.14.003641

Cited by 67 publications

(26 citation statements)

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“…The porosity of pharmaceutical tablets could be measured by studying the GASMAS signal and correlating it with time-of-flight spectroscopy. Drying processes of wood have been studied [4]. A number of medical applications have been developed, for example measurements on the concentration of oxygen in the sinuses for diagnostic purposes [5].…”

Section: Introductionmentioning

confidence: 99%

Laser spectroscopy of gas confined in nanoporous materials

Svensson

Shen

2010

Applied Physics Letters

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We show that high-resolution laser spectroscopy can probe surface interactions of gas confined in nano-cavities of porous materials. We report on strong line broadening and unfamiliar lineshapes due to tight confinement, as well as signal enhancement due to multiple photon scattering. This new domain of laser spectroscopy constitute a challenge for the theory of collisions and spectroscopic lineshapes, and open for new ways of analyzing porous materials and processes taking place therein.Comment: 4 pages, 3 figures, partly presented orally at 7th International Conference on Tunable Diode Laser Spectroscopy (TDLS), July 2009 in Zermatt, Switzerland; Accepted for Applied Physics Letters (December 2009

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Section: Introductionmentioning

confidence: 99%

Laser spectroscopy of gas confined in nanoporous materials

Svensson

Shen

2010

Applied Physics Letters

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“…Water vapor lines around 980 nm were studied in a previous paper on drying processes. 13 Since liquid water, always abundantly present in human tissue, also has an absorption peak at 980 nm, we now choose a shorter wavelength where most of the liquid water absorption is eliminated to allow depth penetration. Investigations of the gas exchange of the sinuses and the nasal cavity in the different geometries have as well been performed using pure nitrogen gas flushed through the nostril.…”

Section: Introductionmentioning

confidence: 99%

Gas monitoring in human sinuses using tunable diode laser spectroscopy

et al. 2007

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Gas monitoring in human sinuses using tunable diode laser spectroscopyPersson, Linda; Andersson, Mats; Lewander, Märta; Svanberg, Katarina; Svanberg, Sune General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract. We demonstrate a novel nonintrusive technique based on tunable diode laser absorption spectroscopy to investigate human sinuses in vivo. The technique relies on the fact that free gases have spectral imprints that are about 10.000 times sharper than spectral structures of the surrounding tissue. Two gases are detected; molecular oxygen at 760 nm and water vapor at 935 nm. Light is launched fiber optically into the tissue in close proximity to the particular maxillary sinus under study. When investigating the frontal sinuses, the fiber is positioned onto the caudal part of the frontal bone. Multiply scattered light in both cases is detected externally by a handheld probe. Molecular oxygen is detected in the maxillary sinuses on 11 volunteers, of which one had constantly recurring sinus problems. Significant oxygen absorption imprint differences can be observed between different volunteers and also left-right asymmetries. Water vapor can also be detected, and by normalizing the oxygen signal on the water vapor signal, the sinus oxygen concentration can be assessed. Gas exchange between the sinuses and the nasal cavity is also successfully demonstrated by flushing nitrogen through the nostril. Advantages over current ventilation assessment methods using ionizing radiation are pointed out. Gas monitoring in human sinuses

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“…The presence and exchange of gases enclosed in scattering media can be assessed by using tunable diode lasers in combination with the gas in scattering media absorption spectroscopy (GASMAS) technique [2]. During recent years, GASMAS has been successfully developed and applied in various fields, e.g., medical diagnostics [3], the monitoring of wood-drying processes [4], pharmaceutical analysis [5], and food science [6,7]. As given by the Beer-Lambert law, the absorption signal of a gas depends on its concentration as well as the path length that the light has travelled.…”

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confidence: 99%