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Optical Engineering

Real-time stand-off spatial detection and identification of gases and vapor using external-cavity quantum cascade laser open-path spectrometer
Author(s): Ran Aharoni; Izhar Ron; Nadav Gilad; Alon Manor; Yehuda Arav; Shai Kendler
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Paper Abstract

An open-path spectrometer for fast spatial detection and identification of gaseous plumes in a realistic environmental conditions is presented. Gases are released in a 500  m3 hall; detection and identification is performed by spectroscopic means—measuring the light spectral absorption (at 8 to 10  μm) by shining an external-cavity quantum cascade laser beam through the inspected volume. Real-time identification is demonstrated for gas plumes of CH2FCF3 (R134a) and CHF3 at a distance of 30 m round trip with a minimum identification level of 0.2 ppm (response times of 2 to 10 s). The relatively wide spectral coverage allows a high probability of detection (PD) and low probability for a false alarm to be obtained in these realistic conditions. It is also demonstrated that the use of several lines-of-sight improves PD as gas spreading in the hall in these conditions is slow and unpredictable.

Paper Details

Date Published: 11 June 2015
PDF: 9 pages
Opt. Eng. 54(6) 067103 doi: 10.1117/1.OE.54.6.067103
Published in: Optical Engineering Volume 54, Issue 6
Show Author Affiliations
Ran Aharoni, IIBR - Israel Institute for Biological Research (Israel)
Izhar Ron, Israel Institute for Biological Research (Israel)
Nadav Gilad, Israel Institute for Biological Research (Israel)
Alon Manor, Israel Institute for Biological Research (Israel)
Yehuda Arav, Israel Institute for Biological Research (Israel)
Shai Kendler, IIBR - Israel Institute for Biological Research (Israel)


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