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

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Author

  • Gabriel Somesfalean
  • Mikael Sjöholm
  • J Alnis
  • C af Klinteberg
  • Stefan Andersson-Engels
  • Sune Svanberg

Summary, in English

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. (C) 2002 Optical Society of America.

Department/s

Publishing year

2002

Language

English

Pages

3538-3544

Publication/Series

Applied Optics

Volume

41

Issue

18

Document type

Journal article

Publisher

Optical Society of America

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 2155-3165