1 December 1994 Gas sensing with λ = 1.57 m distributed feedback laser diodes using overtone and combination band absorption
Author Affiliations +
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.
Vincent Weldon, Vincent Weldon, James O'Gorman, James O'Gorman, Paul J.A. Phelan, Paul J.A. Phelan, Tawee Tanbun-Ek, 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 . Submission:
JOURNAL ARTICLE
4 PAGES


SHARE
RELATED CONTENT


Back to Top