Open AccessLaser absorption spectroscopy of oxygen confined in highly porous hollow sphere xerogel
Author(s) -
Ying-Hsi Lin,
Gabriel Somesfalean,
Sailing He
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.002584
Subject(s) - materials science , spectroscopy , integrating sphere , absorption (acoustics) , optics , scattering , porosity , absorption spectroscopy , microstructure , laser , light scattering , tunable diode laser absorption spectroscopy , mie scattering , porous medium , composite material , tunable laser , physics , quantum mechanics
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 µm). 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.