INSTRUMENTATION FOR THE DIRECT MEASUREMENT OF FOG DROPLET GROWTH.

Abstract

An instrument is in operation that directly measures water droplet growth as a precursor of developmental fog formation. Its potential was recognized as a result of the mesoscale prediction work being done by our company in support of ATC operations at high density air terminals. Water droplet sizes of interest range from 0.1 to 1.0 microns, prior to the particles becoming visible to the human eye. Using optical techniques, the instrument measures the transmission of two discrete wavelengths of ultraviolet light over a path length of 125 feet. The atmosphere is not disturbed. As the absolute value of the transmission is not quantitatively measured, the alignment of the unit is not critical. Several cases of developmental fog were successfully indicated by the instrument several hours before visibility was affected. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1964
Accession Number
AD0608374

Entities

People

  • Robert A. Begun

Tags

DTIC Thesaurus Topics

  • Atmospheres
  • High Density
  • Instrumentation
  • Measurement
  • Measuring Instruments
  • Particles
  • Precursors
  • Terminals
  • Visibility

Readers

  • Aerospace Test and Evaluation
  • Internal Combustion Engine (ICE) Technology.
  • Systems Analysis and Design