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Standoff detection of chemical plumes from high explosive open detonations using a swept-wavelength external cavity quantum cascade laser
- 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.
- Subjects :
- 010302 applied physics
Materials science
Explosive material
business.industry
Detonation
General Physics and Astronomy
02 engineering and technology
021001 nanoscience & nanotechnology
Combustion
01 natural sciences
Spectral line
Plume
law.invention
Wavelength
Optics
law
0103 physical sciences
0210 nano-technology
Absorption (electromagnetic radiation)
business
Quantum cascade laser
Subjects
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