Skip to main content

Mid-Infrared Trace Gas Analysis with Single-Pass Fourier Transform Infrared Hollow Waveguide Gas Sensors

Buy Article:

$29.00 plus tax (Refund Policy)

Abstract:

A hollow core optical fiber gas sensor has been developed in combination with a Fourier transform infrared (FT-IR) spectrometer operating in the spectral range of 4000–500 cm−1, enabling continuous detection of small volume gas-phase analytes such as CH4, CO2, C2H5Cl, or their mixtures at trace levels. Ag/Ag-halide hollow core optical fibers simultaneously serve as an optical waveguide for broad-band mid-infrared radiation and as a miniaturized absorption gas cell. Specifically, carbon dioxide, methane, and ethyl chloride as well as binary mixtures in a carrier gas were analyzed during exponential dilution experiments. In the studies reported here, the integration of an optical gas sensor with FT-IR spectroscopy provides excellent detection limits for small gas volumes (∼1.5 mL) of individual analytes at a few tens of parts per billion (ppb, vol/vol) for carbon dioxide and a few hundreds of ppb (vol/vol) for methane. Furthermore, the broad-band nature of the radiation source and of the hollow core optical waveguide provides the capability of multi-constituent analysis in mixtures.

Keywords: CARBON DIOXIDE; FOURIER TRANSFORM INFRARED SPECTROSCOPY; FT-IR SPECTROSCOPY; HOLLOW WAVEGUIDES; METHANE; MID-INFRARED SENSORS; TRACE GAS SENSING

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370209787598924

Affiliations: 1: Georgia Institute of Technology, School of Chemistry and Biochemistry, Atlanta, Georgia, 30332-0400 2: Lawrence Livermore National Laboratory, Livermore, California 94550 3: University of Ulm, Institute of Analytical and Bioanalytical Chemistry, 89073 Ulm, Germany

Publication date: March 1, 2009

More about this publication?
sas/sas/2009/00000063/00000003/art00013
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more