Extinction Characteristics of Pyrotechnically-Generated Alkali-Halide Smokes
Abstract
The major findings realized from this year's effort are: (1) At approx. 40% RH, the NWC 90 and NWC 164 pyrotechnics appear to provide greater extinction at IR wavelengths longer than approx. 7 micron relative to the other pyrotechnics. This performance may be due to the graphite component of the NWC 90 and NWC 164 aerosol. (2) At approx. 75% RH, extinction produced by NWC 29, NWC 78, NWC 79, NWC 90 and NWC 164 is approximately a factor of four greater than that provided by CY85A. (3) At approx. 90% RH, all six pyrotechnics provide approximately the same degree of extinction effectiveness. (4) The nominal mass yields for the six pyrotechnics appear equivalent. Values ranged from 28 to 37%. (5) Based on SEM analyses of individual particles in the size range 0.2 to 1.9 micrometer, no evidence was seen supporting a significant particle size-chemical composition relationship for the evaluated pyrotechnics. (6) The eutonic mixture of MgCl2 - NaCl and the estimated eutonic mixtures of MgCl2 - NaI provided no decrease in the deliquescence humidity relative to the deliquescence humidity of pure MgCl2. (7) The eutonic mixture of NaCl - KCl provided a 2% RH decrease in the humidity at which deliquescence began relative to pure NaCl.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1981
- Accession Number
- ADA112806
Entities
People
- B. J. Wattle
- E. J. Mack
- J. T. Hanley
Organizations
- Calspan