Fabrication and testing of diamond coatings on infrared windows for the Harrier GR7 and AV8-B systems

Martin D. Hudson; Crofton J. Brierley; Andrew J. Miller; Anthony E. J. Wilson

doi:10.1117/12.277043

27 June 1997 Fabrication and testing of diamond coatings on infrared windows for the Harrier GR7 and AV8-B systems

Martin D. Hudson, Crofton J. Brierley, Andrew J. Miller, Anthony E. J. Wilson

Proceedings Volume 3060, Window and Dome Technologies and Materials V; (1997) https://doi.org/10.1117/12.277043
Event: AeroSense '97, 1997, Orlando, FL, United States

Abstract

Forward looking infrared windows on aircraft suffer damage from liquid and solid particle impact. Diamond is a suitable material for protective coatings on the germanium and zinc sulphide windows used for the 8 - 14 micrometer waveband. The coating of small samples with diamond using microwave plasma assisted chemical vapor deposition has been reported previously, and that technology is being developed to coat flats and domes to over 150 mm in diameter. As a demonstrator, germanium windows for the Harrier GR7 and AV8-B FLIR systems have been diamond coated, and data on these windows is presented. This data includes optical performance in the 8 - 14 micrometer wave band, and the issues of reduction of reflection and scattering losses are discussed. The results of dust erosion and water jet impact testing are presented. The relation of the dust testing parameters to the conditions that military aircraft might be expected to experience in desert condition is discussed. At present, most dust/sand erosion tests appear too severe in terms of dust and sand particle size distributions at given velocities and altitudes.

Citation Download Citation

Martin D. Hudson, Crofton J. Brierley, Andrew J. Miller, and Anthony E. J. Wilson "Fabrication and testing of diamond coatings on infrared windows for the Harrier GR7 and AV8-B systems", Proc. SPIE 3060, Window and Dome Technologies and Materials V, (27 June 1997); https://doi.org/10.1117/12.277043

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