Gas identification and estimation of its concentration in a tube using hyperspectral thermography approach

The aim of this paper is to demonstrate the application of reflective diffraction grating and MWIR thermal camera for identification of gas and estimation of its concentration. For this purpose a special rig was created with airtight tube that was filled with different mixtures of carbon monoxide, carbon dioxide and nitrogen. Thanks to infrared windows at both sides of this tube, the radiation from blackbody could pass through it and diffract at the reflective diffraction grating to finally reach the camera. After spectral calibration this rig may be used to identify gas in a tube, because different gases have different absorption bands. Measuring signal in the absorption band one can estimate the concentration of gas in a tube.