Key comparison CCPR-K1.a as an interlaboratory comparison of correlated color temperature

Petri Kärhä, Anna Vaskuri, Timo Pulli, Erkki Ikonen

    Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

    3 Citations (Scopus)


    We analyze the results of spectral irradiance key comparison CCPR-K1.a for correlated color temperature (CCT). For four participants out of 13, the uncertainties of CCT, calculated using traditional methods, not accounting for correlations, would be too small. The reason for the failure of traditional uncertainty calculation is spectral correlations, producing systematic deviations of the same sign over certain wavelength regions. The results highlight the importance of accounting for such correlations when calculating uncertainties of spectrally integrated quantities.
    Original languageEnglish
    Article number012012
    JournalJournal of Physics: Conference Series
    Issue number1
    Publication statusPublished - 2 Mar 2018
    MoE publication typeA4 Article in a conference publication
    Event13th International Conference on New Developments and Applications in Optical Radiometry, NEWRAD 2017 - Tokyo, Japan
    Duration: 13 Jun 201716 Jun 2017


    This work has been supported by the European Metrology Research Programme (EMRP) within the joint research project ENV59 “Traceability for atmospheric total column ozone” (ATMOZ). The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union.


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