Improvements to the German national primary standard of radiant power above 200 nm

The set of cryogenic radiometers in the Physikalisch-Technische Bundesanstalt (PTB) at Braunschweig was recently completed by the addition of a modified LaseRad II radiometer. The advantages of the improved facility for measurement of optical radiant power are described. The paper outlines the radio...

Full description

Saved in:
Bibliographic Details
Published inMetrologia Vol. 35; no. 4; pp. 279 - 282
Main Authors Stock, K D, Hofer, H, Pawlak, M, Metzdorf, J
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.08.1998
Online AccessGet full text

Cover

More Information
Summary:The set of cryogenic radiometers in the Physikalisch-Technische Bundesanstalt (PTB) at Braunschweig was recently completed by the addition of a modified LaseRad II radiometer. The advantages of the improved facility for measurement of optical radiant power are described. The paper outlines the radiometric calibration chain of the PTB, including a cryogenic laser and broadband radiometer. The link of radiometric units to the International System of Units (SI) volt and ohm in the PTB is presented. Results of current direct international comparisons of cryogenic radiometers and an internal comparison are summarized. The results demonstrate the degree of international equivalence at the lowest level of uncertainty available. The international agreement is within 2 x 10-4.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0026-1394
DOI:10.1088/0026-1394/35/4/11