Development of Spectral Selective Multilayer Film for a Variable Emittance Device and Its Radiation Properties Measurements

K. Shimazaki, A. Ohnishi, Y. Nagasaka

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

A smart radiation device (SRD) that is a variable emittance radiator has been developed as a thermal control material for spacecraft. The SRD has the unique feature of large variation of the total hemispherical emittance εH near room temperature. The εH of the SRD changes depending on its temperature. However, there is a drawback of a large solar absorptance αS. It is too large to use as a thermal control material for spacecraft. In order to reduce the large α S, spectral selective multilayer film was developed. This multilayer film reflects solar radiation and transmits far-infrared radiation to maintain the variation in the εH of the SRD. This paper presents thermal radiative properties of the SRD with spectral selective multilayer film. The multilayer film was designed by using a genetic algorithm (GA). The designed multilayer film was evaporated on the surface of the SRD by the electron beam evaporation method. The experimental results of αS and εH of the SRD with the multilayer film agreed well with calculated results.

Original languageEnglish
Pages (from-to)757-769
Number of pages13
JournalInternational Journal of Thermophysics
Volume24
Issue number3
DOIs
Publication statusPublished - 2003 May 1

Keywords

  • Genetic algorithm
  • LaSrMnO
  • Manganese oxide
  • Multilayer films
  • Optical constants
  • Solar absorptance
  • Spectral reflectance
  • Total hemispherical emittance

ASJC Scopus subject areas

  • Condensed Matter Physics

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