Infrared Imaging Fourier-transform
Spectrometer Used For Standoff Gas Detection
Author(s)
M. Kastek, T. Piątkowski & H. Polakowski
Abstract
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
Keywords
gas detection, hyperspectral detection, imaging Fourier-transformspectrometer, stand-off detection
Related Book
Other papers in this volume
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