6 May 2011 Infrared semiconductor laser based trace gas sensor technologies: recent advances and applications
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Abstract
Recent advances in the development of trace gas sensors based on the use of quantum cascade lasers (QCLs) for the sensitive, selective detection, quantification and monitoring of small molecular gas species with resolved spectroscopic features will be described. High detection sensitivity at ppbv and sub-ppbv concentration levels require detection sensitivity, enhancement schemes such as multipass absorption cells, cavity enhanced absorption techniques, or quartz enhanced photo-acoustic absorption spectroscopy (QEPAS). These three spectroscopic methods can achieve minimum detectable absorption losses in the range from 10-8 to 10-11 cm-1/√Hz. Two recent examples of real world applications of field deployable PAS and QEPAS based gas sensors will be reported, namely the monitoring of ammonia concentrations in exhaled human breath and major urban environments.
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Frank K. Tittel, Frank K. Tittel, Robert F. Curl, Robert F. Curl, Lei Dong, Lei Dong, Rafal Lewicki, Rafal Lewicki, } "Infrared semiconductor laser based trace gas sensor technologies: recent advances and applications", Proc. SPIE 8073, Optical Sensors 2011; and Photonic Crystal Fibers V, 807310 (6 May 2011); doi: 10.1117/12.887217; https://doi.org/10.1117/12.887217
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