A Specular Chamber for Off-Axis Response Evaluations of High-Rejection Optical Baffling System

Abstract

A special chamber for measuring the off-axis response of high- rejection optical baffling systems was designed and constructed. The ambient background power level caused by atmospheric scattering was reduced by using high-efficiency particulate filters to remove the atmospheric aerosols and produce a clean-room environment. The effects of surface scattering were reduced by using specular surfaces in a modified cylindrical shape to direct the scattered radiation away from the baffle entrance. Two computer programs were used to predict the magnitudes of the atmospheric and surface scattering. Measurements which separated the atmospheric scattering from the surface scattering were performed. Rayleigh (molecular) scattering was determined to be the limiting mechanism in achieving a low background.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1976
Accession Number
ADA031212

Entities

People

  • Clair L. Wyatt
  • John C. Kemp

Organizations

  • Utah State University

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Atmospheric Scattering
  • Computer Programs
  • Computers
  • Detectors
  • Diffraction
  • Electromagnetic Scattering
  • Environment
  • Geometry
  • Measurement
  • Mie Scattering
  • Optical Properties
  • Optics
  • Power Levels
  • Radiation
  • Reflectance
  • Refractive Index
  • Scattering

Fields of Study

  • Environmental science
  • Physics

Readers

  • Aerosol Science/Aerosol Physics
  • Optical Physics and Photonics.
  • Phased Array Antenna Design.