WIT Press

Infrared Imaging Fourier-transform Spectrometer Used For Standoff Gas Detection


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161 - 172




1646 kb


M. Kastek, T. Piątkowski & H. Polakowski


The article presents the detection of gases using an infrared imaging Fouriertransform spectrometer (IFTS). The Telops Company has developed the IFTS instrument HyperCam, which is offered as short or long wave infrared device. The principle of HyperCam operation and methodology of gases detection has been shown in the paper, as well as theoretical evaluation of gases detection possibility. The calculation of an optical path between an IFTS device, cloud of gases and background has been also discussed. The variation of a signal reaching the IFTS caused by the presence of a gas has been calculated and compared with the reference signal obtained without the presence of a gas in IFTS’s field of view. Verification of theoretical result has been made by laboratory measurements. Some results of the detection of various types of gases have also been included in the paper. Keywords: gas detection, hyperspectral detection, imaging Fourier-transform spectrometer, stand-off detection. 1 Introduction Fourier-transform spectrometers (FTS) are renowned instruments, particularly well-suited to remotely provide excellent estimates of quantitative data. Many authors have presented how they are using conventional (non-imaging) FTS to perform quantification of distant gas emissions. Amongst others, we should mention the important contributions made by Harig and Matz [1] and Hang et al. [2]. His group performed many measurement campaigns for which they obtained excellent results by ensuring proper modeling of the scene and by paying attention to understand (and to take into account) the instrument signature. Other groups developed similar approaches however limiting their study to optically


gas detection, hyperspectral detection, imaging Fourier-transformspectrometer, stand-off detection