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External cavity widely tunable quantum cascade laser based hollow waveguide gas sensors for multianalyte detection
- Source :
-
Sensors & Actuators B: Chemical . Jun2009, Vol. 140 Issue 1, p24-28. 5p. - Publication Year :
- 2009
-
Abstract
- Abstract: In the study presented here, quantitative detection of ethyl chloride, dichloromethane, and trichloromethane individually and in mixture has been demonstrated using an external cavity broadly tunable quantum cascade laser (EC-QCL) based hollow waveguide gas sensor. The EC-QCL has been characterized by coupling into a FT-IR spectrometer documenting sufficient optical power output across a frequency tuning range from 1297cm−1 to 1219cm−1. Concentrations as low as 4 ppb for ethyl chloride, 7ppm for dichloromethane, and 11 ppb for trichloromethane were detected during exponential dilution experiments with the EC-QCL precisely tuned to selective absorption frequencies of the Q-branch for each constituent at 1287.25cm−1, 1262cm−1, and 1220cm−1, respectively. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09254005
- Volume :
- 140
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Sensors & Actuators B: Chemical
- Publication Type :
- Academic Journal
- Accession number :
- 41241349
- Full Text :
- https://doi.org/10.1016/j.snb.2009.03.023