Airborne midwave and longwave infrared hyperspectral imaging of gases
2014
Characterization of gas clouds are challenging situations to address due to the large and uneven distribution of these fast
moving entities. Whether gas characterization is carried out for gas leaks surveys or environmental monitoring purposes,
explosives and/or toxic chemicals are often involved. In such situations, airborne measurements present distinct
advantages over ground based-techniques since large areas can be covered efficiently from a safe distance. In order to
illustrate the potential of airborne thermal infrared hyperspectral imaging for gas cloud characterization, measurements
were carried out above smokestacks and a ground-based gas release experiment. Quantitative airborne chemical images
of carbon monoxide (CO) and ethylene (C 2 H 4 ) were obtained from measurements carried out using a midwave (MWIR, 3-5 μm) and a longwave (LWIR, 8-12 μm) airborne infrared hyperspectral sensor respectively. Scattering effects were observed in the MWIR experiments on smokestacks as a result of water condensation upon rapid cool down of the hot emission gases. Airborne measurements were carried out using both mapping and targeting acquisition modes. The later
provides unique time-dependent information such as the gas cloud direction and velocity.
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