Abstract
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 language | English |
|---|---|
| Article number | 3077 |
| Pages (from-to) | 3077-3086 |
| Number of pages | 10 |
| Journal | Applied Optics |
| Volume | 56 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 10 Apr 2017 |
| MoE publication type | A1 Journal article-refereed |
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Cite this
Pulli, T., Nevas, S., El Gawhary, O., van den Berg, S., Askola, J., Kärhä, P., Manoocheri, F., & Ikonen, E. (2017). Nonlinearity characterization of array spectroradiometers for the solar UV measurements. Applied Optics, 56(11), 3077-3086. [3077]. https://doi.org/10.1364/AO.56.003077