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Abstract

The rapid development of increasingly accurate infrared instrumentation, has led to a demand of sources of thermal radiation (blackbodies), suitable for the calibration of these instruments. This report describes the intercomparison of standard blackbody sources designed and constructed at four European national standards laboratories. The project has been conducted within the framework of the BCR programme of the CEC. The measurements were made at the following temperatures : item - 160, 300, 500 and 950circC for the NPL and IMGC cavities item - 25, 90, 160 and 250circC for the PTB, INM and NPL cavities.par The overall agreement between cavities was pm 1.3circC which is worse than what could be expected considering the assessed individual uncertainties associated to each cavity. The main cause of the disagreement is attributed to the poorly defined field of view of the radiometer used. NPL who were doing the intercomparison tried to circumvent this weakness by various experimental procedures to align the radiometer and the blackbody sources. However this was not fully successful. Improvement will only be possible with better radiometer devices.

Additional information

Authors: RUSBY R L, NATIONAL PHYSICAL LABORATORY, TEDDINGTON, UK;ANDREWS J W NATIONAL PHYSICAL LABORATORY, TEDDINGTON, UK, NATIONAL PHYSICAL LABORATORY, TEDDINGTON, UK
Bibliographic Reference: EUR 11500 EN (1988) MF, PP 67, ECU 4.00, BLOW-UP COPY, ECU 8.75, AVAILABILITY: EUROFFICE, LUXEMBOURG, BP 1003, GDL
Availability: Can be ordered online
Record Number: 1989126095200 / Last updated on: 1989-05-01
Category: PUBLICATION
Available languages: en