Gas sensing with lambda = 1.57 micrometer distributed feedback laser diodes using overtone and combination band absorption

Vincent Weldon; James O'Gorman; Paul J.A. Phelan; Tawee Tanbun-Ek

doi:10.1117/12.186419

1 December 1994 Gas sensing with λ = 1.57 m distributed feedback laser diodes using overtone and combination band absorption

Vincent Weldon, James O'Gorman, Paul J.A. Phelan, Tawee Tanbun-Ek

Author Affiliations +

Optical Engineering, Vol. 33, Issue 12, (December 1994). https://doi.org/10.1117/12.186419

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.

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Vincent Weldon, James O'Gorman, Paul J.A. Phelan, and Tawee Tanbun-Ek "Gas sensing with λ = 1.57 m distributed feedback laser diodes using overtone and combination band absorption," Optical Engineering 33(12), (1 December 1994). https://doi.org/10.1117/12.186419

Published: 1 December 1994

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