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Field detection of CO and CH4 by NIR 2f modulation laser spectroscopy

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Author(s): A Khorsandi | S Bagherian | S Ghavami Sabouri | C Romano | W Schade

Journal: Iranian Journal of Physics Research
ISSN 1682-6957

Volume: 11;
Issue: 3;
Start page: 337;
Date: 2011;
Original page

Keywords: wavelength modulation spectroscopy | NIR gas sensor | DFB tunable laser

ABSTRACT
  A novel compact fiber-coupled NIR system based on a DFB diode laser source is employed as a portable and sensitive gas sensor for trace detection of combustion pollutant molecules. We demonstrate the performance of such an NIR gas sensor by tracing the absorption lines of CO and CH4 using 2f-WMS technique at moderate temperature of T ~ 600°C in the recuperator channel of an industrial furnace provided by Mobarakeh steel company. This measurement shows the excellent sensitivity of the applied NIR gas sensor to the on-line and in-situ monitoring of such molecular species.
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