Accession Number : ADA325498

Title :   Optical Measurement of Toxic Gases Produced During Firefighting Using Halons.

Descriptive Note : Final rept. Jan 95-Jan 96,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : McNesby, Kevin L. ; Daniel, Robert G. ; Miziolek, Andrzej W. ; Modiano, Steven H.

PDF Url : ADA325498

Report Date : APR 1997

Pagination or Media Count : 46

Abstract : Several optical techniques Fourier transform infrared (Kr-IR) emission and absorption spectroscopy, mid- and near-infrared tunable diode laser (MIR-TDL, NIR-TDL) absorption spectroscopy have been used to measure toxic gases produced during inhibition of flames by halogenated hydrocarbons (Halons). Fire types studied include low-pressure premixed flames, atmospheric-pressure counterflow diffusion flames, open-air JP-8 (turbine fuel) fires, and confined JP-8 fires. Spectra are presented and analyzed for these fires inhibited by CF3Br (Halon 1301) and C3F7H (FM-200). For low-pressure premixed flames, spectra are presented that show production of the CF3 radical in CHWO/Ar flames inhibited by CF3Br. For real scale fire testing, it is shown that type and amount of toxic gases produced during fire inhibition are highly dependent on fire conditions and temperatures, and that some species not considered important (CF2O) are often produced in significant amounts. Finally, it is shown that HF production, during inhibition of vehicle fires using FM-200, is highly dependent on time to suppression.

Descriptors :   *FOURIER TRANSFORMATION, *TOXICITY, *HALOGENATED HYDROCARBONS, *FOURIER SPECTROSCOPY, *INFRARED OPTICAL SYSTEMS, TEST AND EVALUATION, MEASUREMENT, OPTICAL PROPERTIES, HIGH FREQUENCY, PRODUCTION, LOW PRESSURE, GASES, FUELS, SCALE, TURBINES, MIXING, DIFFUSION, FIRE FIGHTING, FIRES, VEHICLES, FLAMES, ABSORPTION SPECTRA, INHIBITION.

Subject Categories : Toxicology
      Organic Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE