High speed temperature, pressure, and water vapor concentration measurement in explosive fireballs using tunable diode laser absorption spectroscopy

Christopher Murzyn, Adam Sims, Herman Krier, Nick Glumac

Research output: Contribution to journalArticle

Abstract

Results from the design, development, and testing of a probe capable of making quantitative measurements of temperature, pressure, and water vapor concentration in near field explosive detonations are presented. This work extends established tunable diode laser absorption techniques to the field of explosive and energetic materials diagnostics with improved temporal resolution. Simultaneous measurement of temperature, pressure, and water vapor concentration were successfully measured at 30 kHz in a constant volume explosion at a standoff distance of 52 cm from 40 g of PBXN-5. Explosive testing was conducted in the 1.81 m3 blast chamber at the University of Illinois at Urbana-Champaign Energetic Materials Diagnostics Lab. Measured values compared very well to theoretical calculations for shocked air during the blast phase as well as late-time quasi static conditions. Data show a discrepancy between pressure and temperature equilibration times. This observation is attributed to comparatively slow mass diffusion of explosive products and thermal diffusion of heat relative to pressure equilibration through shock reflections.

Original languageEnglish (US)
Pages (from-to)186-192
Number of pages7
JournalOptics and Lasers in Engineering
Volume110
DOIs
StatePublished - Nov 2018

Fingerprint

Laser spectroscopy
fireballs
Steam
laser spectroscopy
Absorption spectroscopy
Water vapor
vapor pressure
Semiconductor lasers
water vapor
absorption spectroscopy
diodes
high speed
vapors
blasts
Temperature
Thermal diffusion
temperature
Testing
thermal diffusion
Detonation

Keywords

  • Combustion
  • Diode laser spectroscopy
  • Explosives
  • Temperature measurement

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this

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title = "High speed temperature, pressure, and water vapor concentration measurement in explosive fireballs using tunable diode laser absorption spectroscopy",
abstract = "Results from the design, development, and testing of a probe capable of making quantitative measurements of temperature, pressure, and water vapor concentration in near field explosive detonations are presented. This work extends established tunable diode laser absorption techniques to the field of explosive and energetic materials diagnostics with improved temporal resolution. Simultaneous measurement of temperature, pressure, and water vapor concentration were successfully measured at 30 kHz in a constant volume explosion at a standoff distance of 52 cm from 40 g of PBXN-5. Explosive testing was conducted in the 1.81 m3 blast chamber at the University of Illinois at Urbana-Champaign Energetic Materials Diagnostics Lab. Measured values compared very well to theoretical calculations for shocked air during the blast phase as well as late-time quasi static conditions. Data show a discrepancy between pressure and temperature equilibration times. This observation is attributed to comparatively slow mass diffusion of explosive products and thermal diffusion of heat relative to pressure equilibration through shock reflections.",
keywords = "Combustion, Diode laser spectroscopy, Explosives, Temperature measurement",
author = "Christopher Murzyn and Adam Sims and Herman Krier and Nick Glumac",
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AU - Murzyn, Christopher

AU - Sims, Adam

AU - Krier, Herman

AU - Glumac, Nick

PY - 2018/11

Y1 - 2018/11

N2 - Results from the design, development, and testing of a probe capable of making quantitative measurements of temperature, pressure, and water vapor concentration in near field explosive detonations are presented. This work extends established tunable diode laser absorption techniques to the field of explosive and energetic materials diagnostics with improved temporal resolution. Simultaneous measurement of temperature, pressure, and water vapor concentration were successfully measured at 30 kHz in a constant volume explosion at a standoff distance of 52 cm from 40 g of PBXN-5. Explosive testing was conducted in the 1.81 m3 blast chamber at the University of Illinois at Urbana-Champaign Energetic Materials Diagnostics Lab. Measured values compared very well to theoretical calculations for shocked air during the blast phase as well as late-time quasi static conditions. Data show a discrepancy between pressure and temperature equilibration times. This observation is attributed to comparatively slow mass diffusion of explosive products and thermal diffusion of heat relative to pressure equilibration through shock reflections.

AB - Results from the design, development, and testing of a probe capable of making quantitative measurements of temperature, pressure, and water vapor concentration in near field explosive detonations are presented. This work extends established tunable diode laser absorption techniques to the field of explosive and energetic materials diagnostics with improved temporal resolution. Simultaneous measurement of temperature, pressure, and water vapor concentration were successfully measured at 30 kHz in a constant volume explosion at a standoff distance of 52 cm from 40 g of PBXN-5. Explosive testing was conducted in the 1.81 m3 blast chamber at the University of Illinois at Urbana-Champaign Energetic Materials Diagnostics Lab. Measured values compared very well to theoretical calculations for shocked air during the blast phase as well as late-time quasi static conditions. Data show a discrepancy between pressure and temperature equilibration times. This observation is attributed to comparatively slow mass diffusion of explosive products and thermal diffusion of heat relative to pressure equilibration through shock reflections.

KW - Combustion

KW - Diode laser spectroscopy

KW - Explosives

KW - Temperature measurement

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