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Standoff detection of chemical plumes from high explosive open detonations using a swept-wavelength external cavity quantum cascade laser

Authors :
R. Jason Jones
Bruce E. Bernacki
Jeremy Yeak
Sonia Wharton
Sivanandan S. Harilal
Mark C. Phillips
Source :
Journal of Applied Physics. 128:163103
Publication Year :
2020
Publisher :
AIP Publishing, 2020.

Abstract

A swept-wavelength external cavity quantum cascade laser (ECQCL) is used to perform standoff detection of combustion gases in a plume generated from an outdoor high-explosive (HE) open detonation. The swept-ECQCL system was located at a standoff distance of 830 m from a 41 kg charge of LX-14 (polymer-bonded high explosive) and was used to measure the infrared transmission/absorption through the post-detonation plume as it propagated through the beam path. The swept-ECQCL was operated continuously to record broadband absorption spectra at a 200 Hz rate over a spectral range from 2050 to 2230 cm−1 (4.48–4.88 μm). Fitting of measured spectra was used to determine time-resolved column densities of CO, CO2, H2O, and N2O. Analysis of visible video imagery was used to provide timing correlations and to estimate plume dimensions, from which gas mixing ratios were estimated. Measured emission factors and modified combustion efficiency show good agreement with previously reported values.

Details

ISSN :
10897550 and 00218979
Volume :
128
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........40b4d5485ce543e5d07120ef714590ac
Full Text :
https://doi.org/10.1063/5.0023228