| Zugriffsnummer | 13682 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | Measurement and calculation of the emissivity of a high-temperature black-body |
| Autor(in); Institution |
Galal Yousef, Susan; 4.11, Radiometrische Einheiten, PTB-Braunschweig
Sperfeld, Peter; 4.11, Radiometrische Einheiten, PTB-Braunschweig
Metzdorf, Jürgen; 4.1, Licht und Strahlung, PTB-Braunschweig
|
| Quelle/Jahr | Metrologia: 37 (2000), 5, 365 - 368 |
| ISSN | 0026-1394 |
| Verlag | Sèvres: Bureau International des Poids et Mesures |
| Konferenzangaben | NEWRAD '99, Madrid, 25-27, October, 1999, Spain |
| Freie Schlagworte | irradiance ; emissivity ; High-Temperature ; black-body ; radiometry |
| Zusammenfassung | The emissivity of a high-temperature black-body, which is used for the realisation of the spectral irradiance scale at the Physikalisch-Technische Bundesanstalt (PTB), has been examined experimentally by direct reflection measurements. Measurements at two laser wavelengths show a significant dependence of the normal effective emissivity of the cavity on temperature. The emissivity is very close to the ideal value of unity at temperatures above 2000 K. Preliminary experiments on the reflectance and emissivity of graphite, the materials of the black-body cavity, were done at room temperature. Using the results of these measurements as input parameters for Monte-Carlo calculations of the effective emissivity of the cavity, good agreement with the measurements can be obtained. |
