Laser absorption spectroscopy of oxygen confined in highly porous hollow sphere xerogel
2014 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 22, no 3, 2584-2594 p.Article in journal (Refereed) Published
An Al2O3 xerogel with a distinctive microstructure is studied for the application of laser absorption spectroscopy of oxygen. The xerogel has an exceptionally high porosity (up to 88%) and a large pore size (up to 3.6μm). Using the method of gas-in-scattering media absorption spectroscopy (GASMAS), a long optical path length (about 3.5m) and high enhancement factor (over 300 times) are achieved as the result of extremely strong multiple-scattering when the light is transmitted through the airfilled, hollow-sphere alumina xerogel. We investigate how the microphysical feature influences the optical property. As part of the optical sensing system, the material's gas exchange dynamics are also experimentally studied.
Place, publisher, year, edition, pages
2014. Vol. 22, no 3, 2584-2594 p.
Aerogels, Light, Scattering, Precursors, Media
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-142796DOI: 10.1364/OE.22.002584ISI: 000332518100044PubMedID: 24663551ScopusID: 2-s2.0-84893899243OAI: oai:DiVA.org:kth-142796DiVA: diva2:704696
QC 201403132014-03-132014-03-122015-11-30Bibliographically approved