| Zugriffsnummer | 17879 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Measurement of the absorptance of a cryogenic radiometer cavity in the visible and near infrared |
| Autor(in); Institution |
López, Marco; 4.1, Photometrie und angewandte Radiometrie, PTB-Braunschweig
Hofer, Helmuth; 4.1, Photometrie und angewandte Radiometrie, PTB-Braunschweig
Kück, Stefan; 4.1, Photometrie und angewandte Radiometrie, PTB-Braunschweig
|
| Quelle/Jahr | Metrologia: 42 (2005), 5, 400 - 405 |
| ISSN | 0026-1394 (PRINT) ; 1681-7575 (ONLINE) |
| DOI | |
| URL | |
| Verlag | Bristol, Philadelphia: |
| Freie Schlagworte | cryogenic radiometer ; reflectivity ; absorptance |
| Zusammenfassung | We report the results of the measurement of the absorptance of a LaseRad cavity used as an absorber in the cryogenic radiometer in the Physikalisch-Technische Bundesanstalt (PTB). The measurements were carried out at several laser wavelengths in the visible and near infrared (NIR), with a He-Ne laser operating at 633 nm and with two tunable laser sources operating between 1280 nm and 1360 nm and between 1480 nm and 1620 nm. The absorptance measured at 633 nm of 0.999885 ± 3.0·10-6 matches very well with the value reported by the manufacturer (Cambridge Research & Instrumentation, Inc.) of 0.999879 ± 1.0·10-5. In the NIR the absorptance is approx. 1.1·10-4 ± 3·10-6 lower than at 633 nm, which is significant for high accuracy measurements. The absorptance varies 19·10-6 in the wavelength range from 1280 nm to 1620 nm, this is almost negligible for this wavelength range. |
