Accession Number:

ADP004372

Title:

Infrared Material Optical Damage by Rain,

Descriptive Note:

Corporate Author:

OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES CHATILLON-SOUS-BAGNEUX (FRANCE)

Personal Author(s):

Report Date:

1984-01-01

Pagination or Media Count:

7.0

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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE