From Event: SPIE Optical Engineering + Applications, 2017
The recent development of interband cascade lasers (ICLs) and quantum cascade lasers (QCLs) based trace gas
sensors enables the targeting of strong fundamental rotational-vibrational transitions in the mid-infrared, which are
one to two orders of magnitude more intense than transitions in the near-infrared. This has led to the development of
mid-infrared compact, field deployable sensors based on two sensor system platforms, laser absorption and
quartz enhanced spectroscopy. These sensor platforms are applicable for environmental monitoring, atmospheric
chemistry and for use in the petrochemical industry. The spectroscopic detection and monitoring of three molecular
species, methane (CH4), ethane (C2H6) , formaldehyde (H2CO)  and hydrogen sulphide (H2S)  will be
F. K. Tittel, R. J. Griffin, N. P. Sanchez, W. Ye, Q. He, H. Zheng, M. Giglio, P. Patimisco, A. Sampaolo, and V. Spagnolo, "Trace gas spectroscopy using state-of-the- art mid-infrared semiconductor laser sources: progress, status, and applications," Proc. SPIE 10403, Infrared Remote Sensing and Instrumentation XXV, 1040307 (Presented at SPIE Optical Engineering + Applications: August 07, 2017; Published: 30 August 2017); https://doi.org/10.1117/12.2276023.
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