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The CCPR K1-a key comparison of spectral irradiance from 250 nm to 2500 nm: measurements, analysis and results

Emma R Woolliams, Nigel P Fox, Maurice G Cox, Peter M Harris and Neil J Harrison

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The CCPR K1-a key comparison of spectral irradiance (from 250 nm to 2500 nm) was carried out to meet the requirements of the Mutual Recognition Arrangement by 13 participating national metrology institutes. Because of the fragile nature of the tungsten halogen lamps used as comparison artefacts the comparison was arranged as a star comparison with many more lamps than participants. The National Physical Laboratory (UK) piloted the comparison and, by measuring all lamps, provided a link between participants' measurements. The comparison was analysed using a model-based method, which ensured that all participants, including the pilot, were treated equitably. This paper presents the comparison philosophy, methodology, analysis and results.


PACS

07.57.-c Infrared, submillimeter wave, microwave and radiowave instruments and equipment

06.20.fb Standards and calibration

Subjects

Instrumentation and measurement

Dates

Issue 2 (April 2006)

Received 19 October 2005

Published 29 March 2006



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