Abstract
Gas sensors play an important role in many applications ranging from chemical processing analysis, medical diagnostics to atmospheric pollution monitoring. The application of sensitive mid-infrared (MIR) absorption spectroscopy technique was reported for multiple gas detection, including methane (CH 4 ), carbon monoxide (CO) and carbon dioxide (CO 2 ). With respect to CH 4 detection, a direct laser absorption spectroscopy (SA-DLAS) architecture was proposed exploiting an interband cascade laser (ICL). With respect to CO detection, a MIR CO system was developed based on a broadband light source and a dual-channel sensing scheme. With respect to CO 2 detection, a MIR monitoring sensor system was implemented by using a single-source dual-channel approach with a compact gas cell. The three demonstrated gas sensor systems were deployed for monitoring atmospheric CH 4 and green house CO 2 concentration levels.
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