Format

Send to

Choose Destination
Opt Express. 2014 Feb 10;22(3):2584-94. doi: 10.1364/OE.22.002584.

Laser absorption spectroscopy of oxygen confined in highly porous hollow sphere xerogel.

Abstract

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 3.6 ┬Ám). 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 air-filled, hollow-sphere alumina xerogel. We investigate how the micro-physical feature influences the optical property. As part of the optical sensing system, the material's gas exchange dynamics are also experimentally studied.

PMID:
24663551
DOI:
10.1364/OE.22.002584
[Indexed for MEDLINE]

Supplemental Content

Loading ...
Support Center