When studying the results of the key comparisons of spectral quantities, it appears that in many cases participants’ results systematically deviate from the key comparison reference values over a limited spectral range. We carried out spectral analysis of such deviations in seven key comparisons of optical radiometry. The results reveal an approximate outcome that, on the average, each harmonic amplitude is inversely proportional to the order of the harmonic in all studied key comparisons. This new finding gives important information on the characteristics of spectral correlations. The result can be used in the uncertainty evaluation of spectral integrals, where the effect of unknown spectral correlations has earlier been challenging to assess quantitatively.

中文翻译：

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与关键比较参考值偏差的频谱分析


在研究光谱量关键比较的结果时，在许多情况下，参与者的结果在有限的光谱范围内系统地偏离关键比较参考值。我们在光学辐射测量的七个关键比较中对这种偏差进行了光谱分析。结果揭示了一个近似结果：平均而言，在所有研究的关键比较中，每个谐波幅度与谐波阶数成反比。这一新发现提供了有关谱相关性特征的重要信息。该结果可用于谱积分的不确定性评估，其中未知谱相关性的影响此前一直难以定量评估。