Infrared Material Optical Damage by Rain,

Abstract

A comprehensive study of the optical damage and erosion of various infrared materials is conducted using a rotating arm. The optical damage is characterized by the evolution of the sample modulation transfer function (MTF). The velocity dependence for MTF deterioration is similar to that of the mass loss: occurrence time of damages is inversely proportional to a high-exponent power law of the velocity. For some materials like magnesium fluoride (MgF2), the optical damage occurs in synchronism with the erosion. Inversely, for others like zinc selenide (AnSe), optical damage occurs very early before the beginning of the erosion. Consequently, the screening of candidate materials for irdome must be based on transmission tests, or better on MFT tests, rather than on erosion tests. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1984
Accession Number
ADP004372

Entities

People

  • A. Deom
  • D. L. Balageas
  • G. Gauffre

Organizations

  • Office National d'Études et de Recherches Aérospatiales

Tags

DTIC Thesaurus Topics

  • Chemical Compounds
  • Compound Semiconductors
  • Electronics
  • Engineering
  • Fluorides
  • Magnesium
  • Materials
  • Modulation
  • Personal Information Managers
  • Semiconductors
  • Solid State Electronics
  • Synchronism
  • Transfer Functions

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Geotechnical Engineering.
  • Materials Science and Engineering.