Characterization of the pore structure of alumina ceramics by diffuse radiation propagation in the near infrared
| Autor: | Jochen Fricke, R. Caps, Jochen Manara, F. Raether |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Materials science
Scattering business.industry Mie scattering Atomic and Molecular Physics and Optics Light scattering Electronic Optical and Magnetic Materials Optics Extinction (optical mineralogy) visual_art visual_art.visual_art_medium Transmittance Radiative transfer Ceramic Diffuse reflection Electrical and Electronic Engineering Physical and Theoretical Chemistry business |
| Zdroj: | Optics Communications. 168:237-250 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/s0030-4018(99)00347-8 |
| Popis: | Light scattering by pore/particle interfaces causes diffuse light propagation in ceramics. The diffuse light transmission is highly sensitive to structural changes in the last sintering state. The transmission increases more than one order of magnitude between 93% and 99% of the theoretically possible density. By using diffuse transmission and reflection measurements, a quantitative analysis of the pore size distribution can also be made. The directional-hemispherical transmittance and reflectance of partially sintered Al 2 O 3 -samples were measured at room temperature in the wavelength range from 700 nm to 2500 nm. A three-flux solution of the equation of radiative transfer is shown to be an adequate tool to derive the extinction coefficients from the directional-hemispherical transmittances. The pore size distribution was determined by fitting theoretical light scattering of spherical pores, which was calculated by the Mie theory, to the experimental extinction data. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect