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 language | English |
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Article number | 067103 |
Journal | Optical Engineering |
Volume | 54 |
Issue number | 6 |
DOIs | |
State | Published - 1 Jun 2015 |
Externally published | Yes |
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