Infrared imaging Fourier-transform spectrometer used for standoff gas detection

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.

Passive optoelectronics systems for standoff gas detection: results of tests

“…An operation range of the interferometer is 3-5 m (MWIR version) or 8-12 m (LWIR) and tuning velocity is of about [10][11][12][13][14][15][16][17][18][19][20] ms. An interferometer module, containing a detector matrix, has been developed by the Physical Sciences, Inc. and it is known as AIRIS (Adaptive InfraRed Imaging Spectroradiometer) [2].…”

“…For an atmospheric tracking of gases however, the HyperCam sensor has a sufficient frame rate [14,15]. HyperCam can be used for remote gas detection, identification and quantification from turbulent stack plumes which makes it also suitable to detect terrorist attacks involving the release of hazardous chemical compounds [14][15][16][17].…”

“…6(a) shows a picture of a Hyper-Cam LWIR. The sensor is controlled by field computer and data is stored on a RAID drive to guarantee integrity of data [17]. Imaging Fourier-transform spectroradiometer -HyperCam -uses the layout of a Michelson interferometer.…”