Real-time stand-off spatial detection and identification of gases and vapor using external-cavity quantum cascade laser open-path spectrometer

Ran Aharoni; Izhar Ron; Nadav Gilad; Alon Manor; Yehuda Arav; Shai Kendler

doi:10.1117/1.OE.54.6.067103

11 June 2015 Real-time stand-off spatial detection and identification of gases and vapor using external-cavity quantum cascade laser open-path spectrometer

Ran Aharoni, Izhar Ron, Nadav Gilad, Alon Manor, Yehuda Arav, Shai Kendler

Author Affiliations +

Optical Engineering, Vol. 54, Issue 6, 067103 (June 2015). https://doi.org/10.1117/1.OE.54.6.067103

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.

Citation Download Citation

Ran Aharoni, Izhar Ron, Nadav Gilad, Alon Manor, Yehuda Arav, and Shai Kendler "Real-time stand-off spatial detection and identification of gases and vapor using external-cavity quantum cascade laser open-path spectrometer," Optical Engineering 54(6), 067103 (11 June 2015). https://doi.org/10.1117/1.OE.54.6.067103

Published: 11 June 2015

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