Reflectivity of the AL-N coating: results of mechanical and environmental tests

Vladimir P. Anisimov; Irina A. Anisimova; Victor A. Kashirin; Kamil A. Moldosanov; Alexander M. Skrynnikov

doi:10.1117/12.452311

22 October 2002 Reflectivity of the AL-N coating: results of mechanical and environmental tests

Vladimir P. Anisimov, Irina A. Anisimova, Victor A. Kashirin, Kamil A. Moldosanov, Alexander M. Skrynnikov

Proceedings Volume 4780, Surface Scattering and Diffraction for Advanced Metrology II; (2002) https://doi.org/10.1117/12.452311
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

This paper concerns a behavior of the total hemispherical reflectance (THR) of the Al-N coating in the course of mechanical and environmental tests. The Al-N coating has been designed to reduce the stray sunlight background in the satellite-borne optical instruments and charge-particles-analyzing apparatus operating in open space under intensive solar radiation. Usually, this problem arises when a density of instruments installed on the satellite is high and it is difficult to avoid getting to instrument the light reflected by neighboring devices. Resolution of this problem is also important in connection with development of the extra-atmosphere Far UV astronomy. The THR measurement results are presented for 10 wavelengths wihtin a range from 400 to 927 nm, and also at 121.6 nm, the most intensive line of the solar UV spectrum able to result in considerable contribution to the detector noise in space devices. The samples of the Al-N coating were exposed to standard mechanical loads including the vibratory loads, linear overloads, and impacts, to which the space equipment may be subjected when shipping to the space-vehicle launching site and also when lauching. The samples were also exposed to environmental tests simulating the vacuum, humidity, and cyclic temperature conditions, which may influence the space instruments while shipping, storing, launching, in flight, and under operating conditions. The THR measurements of the samples were made following exposure to each test. The THRs of tested samples at the wavelength of 121.6 nm were as low as 1.5-2%.

Citation Download Citation

Vladimir P. Anisimov, Irina A. Anisimova, Victor A. Kashirin, Kamil A. Moldosanov, and Alexander M. Skrynnikov "Reflectivity of the AL-N coating: results of mechanical and environmental tests", Proc. SPIE 4780, Surface Scattering and Diffraction for Advanced Metrology II, (22 October 2002); https://doi.org/10.1117/12.452311

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KEYWORDS

Coating

Reflectivity

Aerospace engineering

Space operations

Humidity

Aluminum

Satellites

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