Development of Multispectral Sandwich-Type IR Windows.

Abstract

Composite or sandwich-type multispectral windows up to 4 x 6 inch in size have been fabricated by a Westinghouse-developed technique called optical brazing. Of the numerous cladding, substrate and adhesives tested, the ZnS/ZnSe composite window is now the most promising for airborne common aperture systems. Optical path differences in the assembled windows stem mainly from material property variations in the component parts, not from the binding agent. These path differences can for the most part be corrected during final polishing of the composite window. The ZnS/ZnSe window transmittance with AR coating exceeds the 60% visible wavelength and 1.06 and 95% 8-12 micrometer transmittance requirements. Composite window specimens are as rain erosion resistant as monolithic ZnS. Optical brazing is a versatile technique for composite window fabrication and has been used to join other cladding and substrate combinations such as MgF2/ZnSe. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1977
Accession Number
ADA045655

Entities

People

  • G. B. Brandt
  • J. Schruben
  • R. A. Hoffman
  • R. H. Hopkins
  • W. E. Kramer

Tags

Communities of Interest

  • Engineered Resilient Systems
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Antireflection Coatings
  • Chemical Vapor Deposition
  • Coatings
  • Erosion Resistance
  • Fabrication
  • Long Wavelengths
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Measurement
  • Mechanical Properties
  • Optical Materials
  • Optical Properties
  • Refractive Index
  • Single Crystals
  • Thermal Conductivity
  • Thermal Expansion

Fields of Study

  • Materials science

Readers

  • Reinforced Composite Materials
  • Solar Photovoltaics and Thermoelectric Devices.
  • Surface Engineering/Surface Coating Technology.