| Zugriffsnummer | 37814 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Direct comparison of cryogenic radiometers from the BIPM and the PTB |
| Autor(in); Institution |
Goebel, R.; Bureau International des Poids et Mesures, Sèvres Cedex, FRANCE
Pello, R.; Bureau International des Poids et Mesures, Sèvres Cedex, FRANCE
Stock, Klaus; 4.11, Radiometrische Einheiten, PTB-Braunschweig
Hofer, Helmut; 4.11, Radiometrische Einheiten, PTB-Braunschweig
|
| Quelle/Jahr | Metrologia: 34 (1997), 3, 257 - 259 |
| ISSN | 0026-1394 |
| DOI | |
| Verlag | Sèvres: BIPM |
| Zusammenfassung | For the first time, the cryogenic radiometer of the Bureau International des Poids et Mesures (BIPM) has been taken to a national metrology institute for direct comparison with another cryogenic radiometer. This paper describes a comparison at the Physikalisch-Technische Bundesanstalt (PTB, Braunschweig, Germany) with the PTB cryogenic radiometer. The two systems have been shown to differ, in relative terms, by 2,3 × 10-4 in the measurement of optical power at λ = 632,8 nm with a power level of about 700 μW. The standard uncertainty in the determination of this relative difference is estimated to be 5,7 × 10-5. As the source of this discrepancy, which is larger than the uncertainties, has not yet been found, a closer investigation of the two systems is necessary. |
