Details
| Original language | English |
|---|---|
| Article number | 065904 |
| Number of pages | 9 |
| Journal | Measurement science and technology |
| Volume | 33 |
| Issue number | 6 |
| Early online date | 11 Mar 2022 |
| Publication status | Published - Jun 2022 |
Abstract
A mobile calibration system for a multidirectional spectroradiometer (MUDIS) to transfer the absolute radiometric calibration from the laboratory to the location of the outdoor-measurement (field calibrator) has been developed. The main part of the calibration system comprises an aluminium sphere with a diameter of 40 cm, mounting adapters and a ventilation system. The MUDIS device is capable of measuring spectral radiance from 320 to 600 nm in 113 different directions simultaneously within 1 s. When repeating radiance measurements inside the mobile field sphere, the relative standard deviation (RSD) for wavelengths between 320 and 600 nm is less than 1.8% (320 nm) for all directions with minimum RSD of 0.6% at 382 nm. The reproducibility depends not only on the wavelength but also on the individual fibre position on the hemispherical input optics, with maximum of 4.5% RSD, but most directions show a lower deviation. On average, the RSD for the channels is less than 0.9%. The calibrator enables measurements of the spectral radiance with less uncertainty than with the previous indirect calibration method, which uses measurements of a scanning reference array spectroradiometer.
Keywords
- field calibration, multidirectional, multidirectional spectroradiometer (MUDIS), reproducibility, spectral radiance
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Instrumentation
- Engineering(all)
- Engineering (miscellaneous)
- Mathematics(all)
- Applied Mathematics
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In: Measurement science and technology, Vol. 33, No. 6, 065904, 06.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Field calibration for multidirectional spectroradiometers
AU - Niedzwiedz, Angelika
AU - Duffert, Jens
AU - Tobar-Foster, Mario
AU - Heinzel, Jan Wilko
AU - Seckmeyer, Gunther
PY - 2022/6
Y1 - 2022/6
N2 - A mobile calibration system for a multidirectional spectroradiometer (MUDIS) to transfer the absolute radiometric calibration from the laboratory to the location of the outdoor-measurement (field calibrator) has been developed. The main part of the calibration system comprises an aluminium sphere with a diameter of 40 cm, mounting adapters and a ventilation system. The MUDIS device is capable of measuring spectral radiance from 320 to 600 nm in 113 different directions simultaneously within 1 s. When repeating radiance measurements inside the mobile field sphere, the relative standard deviation (RSD) for wavelengths between 320 and 600 nm is less than 1.8% (320 nm) for all directions with minimum RSD of 0.6% at 382 nm. The reproducibility depends not only on the wavelength but also on the individual fibre position on the hemispherical input optics, with maximum of 4.5% RSD, but most directions show a lower deviation. On average, the RSD for the channels is less than 0.9%. The calibrator enables measurements of the spectral radiance with less uncertainty than with the previous indirect calibration method, which uses measurements of a scanning reference array spectroradiometer.
AB - A mobile calibration system for a multidirectional spectroradiometer (MUDIS) to transfer the absolute radiometric calibration from the laboratory to the location of the outdoor-measurement (field calibrator) has been developed. The main part of the calibration system comprises an aluminium sphere with a diameter of 40 cm, mounting adapters and a ventilation system. The MUDIS device is capable of measuring spectral radiance from 320 to 600 nm in 113 different directions simultaneously within 1 s. When repeating radiance measurements inside the mobile field sphere, the relative standard deviation (RSD) for wavelengths between 320 and 600 nm is less than 1.8% (320 nm) for all directions with minimum RSD of 0.6% at 382 nm. The reproducibility depends not only on the wavelength but also on the individual fibre position on the hemispherical input optics, with maximum of 4.5% RSD, but most directions show a lower deviation. On average, the RSD for the channels is less than 0.9%. The calibrator enables measurements of the spectral radiance with less uncertainty than with the previous indirect calibration method, which uses measurements of a scanning reference array spectroradiometer.
KW - field calibration
KW - multidirectional
KW - multidirectional spectroradiometer (MUDIS)
KW - reproducibility
KW - spectral radiance
UR - http://www.scopus.com/inward/record.url?scp=85126662586&partnerID=8YFLogxK
U2 - 10.1088/1361-6501/ac56be
DO - 10.1088/1361-6501/ac56be
M3 - Article
AN - SCOPUS:85126662586
VL - 33
JO - Measurement science and technology
JF - Measurement science and technology
SN - 0957-0233
IS - 6
M1 - 065904
ER -