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Optical constant measurements of solar thermochemical reaction catalysts and optical window
- Source :
- Optik. 131:323-334
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Because of the ultra-high operation temperature in solar thermochemical reactors, radiative transfer accounts for the majority of the total heat transfer. Determining the radiative characteristics of catalysts during solar thermochemical reactions is critical for numerical calculations. Optical constant of material is only determined by the intrinsic properties of materials and not related to the micro-structural morphology. In this study, optical constants of four typical types of metal oxides often used as catalysts during solar thermochemical reactions were obtained by using infrared variable angle spectroscopic ellipsometry. In addition, the variation of optical constant of quartz window with temperature was also investigated using infrared variable angle spectroscopic ellipsometry in the far infrared spectral region. The experimental results indicated that the peak values of the refractive index and extinction coefficient of the optical window decreased with increasing temperature, and the degree of polarization of optical window decreased with increasing temperature and already decreased to 40% at 673 K in the spectral range of 7.2–7.5 μm. In addition, the refractive index and extinction coefficient varied sharply with increasing wavelength for both the catalysts and optical window.
- Subjects :
- Materials science
Infrared
business.industry
020209 energy
Analytical chemistry
Physics::Optics
02 engineering and technology
Molar absorptivity
021001 nanoscience & nanotechnology
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
Wavelength
Optics
Far infrared
Heat transfer
0202 electrical engineering, electronic engineering, information engineering
Radiative transfer
Degree of polarization
Physics::Chemical Physics
Electrical and Electronic Engineering
0210 nano-technology
business
Refractive index
Subjects
Details
- ISSN :
- 00304026
- Volume :
- 131
- Database :
- OpenAIRE
- Journal :
- Optik
- Accession number :
- edsair.doi...........0dfe444ab248040ad1ee0ed2b105c517