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Title: Standoff chemical plume detection in turbulent atmospheric conditions with a swept-wavelength external cavity quantum cascade laser

Abstract

Rapid and sensitive standoff measurement techniques are needed for detection of trace chemicals in outdoor plume releases. Here, we present results from 235 m standoff detection of transient plumes for 5 gas-phase chemicals: Freon 152a (1,1-difluoroethane), Freon 134a (1,1,1,2-tetrafluoroethane), methanol (CH3OH), nitrous oxide (N2O), and ammonia (NH3). A swept-ECQCL measures infrared absorption spectra over the range 8.37- 10.47 µm, from which chemical concentrations are determined via spectral fits. The fast 400 Hz scan rate of the swept-ECQCL enables measurement above the turbulence time-scales, reducing noise and allowing plume fluctuations to be measured. For high-speed plume detection, measurement precisions of 1-2 ppm*m are demonstrated with 2.5 ms time resolution, improving to 100-400 ppb*m with 100 ms averaging.

Authors:
ORCiD logo; ; ORCiD logo; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
OSTI Identifier:
1601718
Alternate Identifier(s):
OSTI ID: 1604772
Report Number(s):
[PNNL-SA-149581]
[Journal ID: ISSN 1094-4087; OPEXFF]
Grant/Contract Number:  
[SC0019855; AC05-76RL01830]
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
[Journal Name: Optics Express Journal Volume: 28 Journal Issue: 5]; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
(280.4788) Optical Sensing, Quantum Cascade Laser Spectroscopy, trace gas sensing, broadband laser spectroscopy, Isotope analysis, laser absorption spectroscopy

Citation Formats

Phillips, Mark C., Bernacki, Bruce E., Harilal, Sivanandan S., Yeak, Jeremy, and Jones, R. Jason. Standoff chemical plume detection in turbulent atmospheric conditions with a swept-wavelength external cavity quantum cascade laser. United States: N. p., 2020. Web. doi:10.1364/OE.385850.
Phillips, Mark C., Bernacki, Bruce E., Harilal, Sivanandan S., Yeak, Jeremy, & Jones, R. Jason. Standoff chemical plume detection in turbulent atmospheric conditions with a swept-wavelength external cavity quantum cascade laser. United States. doi:10.1364/OE.385850.
Phillips, Mark C., Bernacki, Bruce E., Harilal, Sivanandan S., Yeak, Jeremy, and Jones, R. Jason. Wed . "Standoff chemical plume detection in turbulent atmospheric conditions with a swept-wavelength external cavity quantum cascade laser". United States. doi:10.1364/OE.385850.
@article{osti_1601718,
title = {Standoff chemical plume detection in turbulent atmospheric conditions with a swept-wavelength external cavity quantum cascade laser},
author = {Phillips, Mark C. and Bernacki, Bruce E. and Harilal, Sivanandan S. and Yeak, Jeremy and Jones, R. Jason},
abstractNote = {Rapid and sensitive standoff measurement techniques are needed for detection of trace chemicals in outdoor plume releases. Here, we present results from 235 m standoff detection of transient plumes for 5 gas-phase chemicals: Freon 152a (1,1-difluoroethane), Freon 134a (1,1,1,2-tetrafluoroethane), methanol (CH3OH), nitrous oxide (N2O), and ammonia (NH3). A swept-ECQCL measures infrared absorption spectra over the range 8.37- 10.47 µm, from which chemical concentrations are determined via spectral fits. The fast 400 Hz scan rate of the swept-ECQCL enables measurement above the turbulence time-scales, reducing noise and allowing plume fluctuations to be measured. For high-speed plume detection, measurement precisions of 1-2 ppm*m are demonstrated with 2.5 ms time resolution, improving to 100-400 ppb*m with 100 ms averaging.},
doi = {10.1364/OE.385850},
journal = {Optics Express},
number = [5],
volume = [28],
place = {United States},
year = {2020},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1364/OE.385850

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