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

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

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 externalcavity 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.

Original languageEnglish
Article number067103
JournalOptical Engineering
Volume54
Issue number6
DOIs
StatePublished - 1 Jun 2015
Externally publishedYes

Keywords

  • detection
  • environmental monitoring
  • external-cavity quantum cascade laser
  • indoor transport and dispersion
  • open-path spectrometer
  • quantum cascade laser
  • remote sensing
  • spectrometer
  • stand-off

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • General Engineering

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