Infrared Transmission through Screening Smokes: Experimental Considerations

Abstract

Presented are the basic principles that the experimentalists should consider before measuring the infrared transmission of an aerosol. Three basic methods are examined: laser transmissometers, broadband radiometer- transmissometers, and thermal imaging systems. The effects of single and multiple scattering and receiver field of view are discussed. Aerosol coagulation and sedimentation are considered. The effects of the spectral properties of the detector response, atmospheric transmission, and source temperature are related to the measured transmission. This can differ significantly from the true aerosol transmission. When using a thermal imaging system, the amount of smoke necessary to obscure a target depends upon whether the thermal system has an automatic gain control. Furthermore, the amount of smoke necessary depends upon the angular subtense of the target. All of the experimental problems discussed are shown graphically in three flow charts.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1980
Accession Number
ADA086773

Entities

People

  • Gerald C. Holst

Organizations

  • United States Army Armament Research, Development and Engineering Center

Tags

Communities of Interest

  • Advanced Electronics
  • Biomedical
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Automatic Gain Control
  • Backscattering
  • Bandwidth
  • Broadband
  • Detection
  • Detectors
  • Equations
  • Forward Scattering
  • Frequency
  • Lasers
  • Measurement
  • Munitions
  • Particle Size
  • Radiation
  • Radiometers
  • Scattering
  • Target Signatures

Fields of Study

  • Physics

Readers

  • Aerosol Science/Aerosol Physics
  • Spectroscopy.
  • Theoretical Analysis.

Technology Areas

  • Directed Energy