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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 18 — Jun. 20, 2002
  • pp: 3538–3544

Concentration measurement of gas embedded in scattering media by employing absorption and time-resolved laser spectroscopy

Gabriel Somesfalean, Mikael Sjöholm, Janis Alnis, Claes af Klinteberg, Stefan Andersson-Engels, and Sune Svanberg  »View Author Affiliations


Applied Optics, Vol. 41, Issue 18, pp. 3538-3544 (2002)
http://dx.doi.org/10.1364/AO.41.003538


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Abstract

Diode-laser-based absorption spectroscopy for the evaluation of embedded gas concentrations in porous materials is demonstrated in measurements of molecular oxygen dispersed throughout scattering polystyrene foam, used here as a generic test material. The mean path length of light scattered in the material is determined with the temporal characteristics of the radiation transmitted through the sample. This combined with sensitive gas-absorption measurements employing wavelength-modulation spectroscopy yields an oxygen concentration in polystyrene foam of 20.4% corresponding to a foam porosity of 98%, which is consistent with manufacturing specifications. This feasibility study opens many possibilities for quantitative measurements by using the method of gas-in-scattering-media absorption spectroscopy.

© 2002 Optical Society of America

OCIS Codes
(290.4210) Scattering : Multiple scattering
(290.7050) Scattering : Turbid media
(300.1030) Spectroscopy : Absorption
(300.6380) Spectroscopy : Spectroscopy, modulation
(300.6390) Spectroscopy : Spectroscopy, molecular

History
Original Manuscript: July 23, 2001
Revised Manuscript: January 2, 2002
Published: June 20, 2002

Citation
Gabriel Somesfalean, Mikael Sjöholm, Janis Alnis, Claes af Klinteberg, Stefan Andersson-Engels, and Sune Svanberg, "Concentration measurement of gas embedded in scattering media by employing absorption and time-resolved laser spectroscopy," Appl. Opt. 41, 3538-3544 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-18-3538

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