Concentration measurement of gas embedded in scattering media by employing absorption and time-resolved laser spectroscopy
Författare
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.
Avdelning/ar
Publiceringsår
2002
Språk
Engelska
Sidor
3538-3544
Publikation/Tidskrift/Serie
Applied Optics
Volym
41
Issue
18
Fulltext
- Available as PDF - 145 kB
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Dokumenttyp
Artikel i tidskrift
Förlag
Optical Society of America
Ämne
- Atom and Molecular Physics and Optics
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 2155-3165