Recent advances in the passive standoff detection of chemical vapors by differential FTIR radiometry

Hugo Lavoie; Eldon Puckrin; Jean-Marc Theriault; Francois Bouffard; Denis Dube

doi:10.1117/12.602586

12 May 2005 Recent advances in the passive standoff detection of chemical vapors by differential FTIR radiometry

Hugo Lavoie, Eldon Puckrin, Jean-Marc Theriault, Francois Bouffard, Denis Dube

Proceedings Volume 5795, Chemical and Biological Sensing VI; (2005) https://doi.org/10.1117/12.602586
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

A method for the passive remote monitoring of chemical vapours by differential Fourier-transform infrared (FTIR) radiometry is presented for determining the characteristics of chemical vapour plumes released from stacks at various horizontal distances from the FTIR sensor. The measurement technique is based on the use of a double-beam FTIR spectrometer that is optimized for optical subtraction. A description is given of the customized interferometer, along with a discussion of the analysis algorithm that has been developed for the on-line detection, identification and quantification of chemical vapour plumes. Experimental results are presented from a number of open-air trials that demonstrate the passive detection, identification and quantification of vapour plumes, which consist of DMMP, ammonia, methanol and sulphur hexafluoride gases probed at standoff distances of up to 1.5 km. In addition, recent results obtained at the open-air range at Defence Research and Development Canada (DRDC)-Valcartier are presented for the detection of a vapour plume of sulphur hexafluoride (SF₆) measured at a standoff distance of 5.7 km. This work represents the first such measurement reported in the open literature for such a large standoff distance. These results clearly demonstrate the applicability of the differential radiometry approach for successfully detecting and identifying chemical vapour clouds located at long distances from the sensor.

Citation Download Citation

Hugo Lavoie, Eldon Puckrin, Jean-Marc Theriault, Francois Bouffard, and Denis Dube "Recent advances in the passive standoff detection of chemical vapors by differential FTIR radiometry", Proc. SPIE 5795, Chemical and Biological Sensing VI, (12 May 2005); https://doi.org/10.1117/12.602586

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