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Optical Engineering

Gas sensing with λ = 1.57 m distributed feedback laser diodes using overtone and combination band absorption
Author(s): Vincent Weldon; James O'Gorman; Paul J.A. Phelan; Tawee Tanbun-Ek
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Paper Abstract

Spectral measurements of the v1 + v2 + v3 combination absorption band of H2S were made over a 10-nm wavelength range around 1.57 m with two tunable distributed feedback (DFB) laser diodes. Targeting the strongest observed H2S absorption feature, a detection limit at atmospheric pressure of 50 ppm/m is indicated from the measured detectivity at higher concentration. We also probed the 2v1 + 2v2 + v3 overtone and combination absorption band of CO2 and investigated the dependence of absorption linewidth on pressure and assessed its implications for expected low-detection limits. These results demonstrate the utility of DFB laser diodes for industrial applications in the area of toxic and trace gas monitoring.

Paper Details

Date Published: 1 December 1994
PDF: 4 pages
Opt. Eng. 33(12) doi: 10.1117/12.186419
Published in: Optical Engineering Volume 33, Issue 12
Show Author Affiliations
Vincent Weldon, Trinity College (Ireland)
James O'Gorman, Trinity College (Ireland)
Paul J.A. Phelan, Optoelectronica, INESC (Portugal)
Tawee Tanbun-Ek, AT&T Bell Labs. (United States)

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