Materials, Photonic Devices, and Sensors

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

[+] Author Affiliations
Ran Aharoni, Nadav Gilad, Shai Kendler

Israel Institute for Biological Research (IIBR), Department of Environmental Physics, P.O.B 19, Ness-Ziona 7410001, Israel

Izhar Ron

Israel Institute for Biological Research (IIBR), Department of Physical Chemistry, P.O.B 19, Ness-Ziona 7410001, Israel

Alon Manor, Yehuda Arav

Israel Institute for Biological Research (IIBR), Department of Applied Mathematics, P.O.B 19, Ness-Ziona 7410001, Israel

Opt. Eng. 54(6), 067103 (Jun 11, 2015). doi:10.1117/1.OE.54.6.067103
History: Received December 2, 2014; Accepted May 8, 2015
Text Size: A A A

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 500m3 hall; detection and identification is performed by spectroscopic means—measuring the light spectral absorption (at 8 to 10μm) 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.

Figures in this Article
© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Ran Aharoni ; Izhar Ron ; Nadav Gilad ; Alon Manor ; Yehuda Arav, et al.
"Real-time stand-off spatial detection and identification of gases and vapor using external-cavity quantum cascade laser open-path spectrometer", Opt. Eng. 54(6), 067103 (Jun 11, 2015). ; http://dx.doi.org/10.1117/1.OE.54.6.067103


Tables

Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

PubMed Articles
Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.