Nonlinearity characterization of array spectroradiometers for the solar UV measurements

Research output: Contribution to journalArticle


Research units

  • Physikalisch-Technische Bundesanstalt
  • VTT MIKES Metrology
  • VSL Dutch Metrology Institute


Array spectroradiometers are attractive alternatives to scanning spectroradiometers in solar ultraviolet measurements. However, the measurement of solar spectral irradiance imposes stringent requirements for the linearity of the instruments. In this article, two array spectroradiometers were characterized for nonlinearity. Significant nonlinearities, in excess of 10%, as a function of analog-to-digital converter counts were discovered. Additional nonlinearities as a function of integration time were observed at very long integration times. No clear residual nonlinearity as a function of spectral irradiance was witnessed despite the characterization spanning four orders of magnitude of spectral irradiance. The characterizations were carried out with three measurement setups that are briefly compared.


Original languageEnglish
Pages (from-to)3077-3086
Number of pages10
JournalApplied Optics
Issue number11
Publication statusPublished - 10 Apr 2017
MoE publication typeA1 Journal article-refereed

ID: 12973454