Accession Number : AD0693782

Title :   AN ANALYSIS OF LABORATORY METHODS OF MEASURING SCATTERING PARAMETERS WHICH CHARACTERIZE OBSCURATION EFFECTS OF AEROSOLS.

Descriptive Note : Memorandum rept.,

Corporate Author : BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : Gott,Preston F. ; Downs,Alan R.

Report Date : AUG 1969

Pagination or Media Count : 41

Abstract : If an aerosol is introduced between an observer and an object of interest, the apparent contrast between the target and background will decrease. The mechanism of contrast reduction depends on meteorological conditions, the testing geometry, and the way radiation interacts with the aerosol. Some previous approaches to the problem and their limitations are discussed. The mechanism of contrast reduction is described and related to relevant properties of aerosols. A specific design for a chamber to measure relevant aerosol properties is described. References to other work are included when alternative chamber design features are feasible. A Monte Carlo technique is described which can utilize measurements made in the chamber to obtain answers to tactical problems. (Author)

Descriptors :   (*VISUAL ACUITY, *AIR POLLUTION), (*AEROSOLS, SCATTERING), VISIBILITY, ATMOSPHERIC CONDENSATION, TEST METHODS

Subject Categories : Atmospheric Physics
      Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE