Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 140, Issue 1, Pages 24-28Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.03.023
Keywords
External cavity tunable quantum cascade lasers; Gas sensors; Mid-infrared sensors; Hollow waveguides; Absorption; Vibrational spectroscopy; Chlorinated hydrocarbons
Funding
- Laboratory Directed Research and Development Program at LLNL [B565491]
- ExxonMobil Research and Engineering Company, Annandale, NewJersey
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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 1297 cm(-1) to 1219 cm(-1). Concentrations as low as 4 ppb for ethyl chloride, 7 ppm 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 1287.25 cm(-1), 1262 cm(-1), and 1220 cm(-1), respectively. (C) 2009 Published by Elsevier B.V.
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