Uncertainty Support in the Spectral Information System SPECCHIO

Hueni, Andreas; Mason, Kimberley; Trim, Simon A.

doi:10.1109/jstars.2023.3251894

Cited by 5 publications

(1 citation statement)

References 37 publications

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“…6 shows radiance timeseries grouped per attenuation level, where each mean per measurement round was normalised by the mean of all rounds. These timeseries are plotted for strategically selected wavelengths, taking into account our a priori knowledge about behavior of ASD full range instruments [24], [25]: (1) 350 nm is the start of the VNIR and typically has a low Signal-to-Noise Ratio (SNR) due to lower quantum efficiency (QE) combined with low radiances provided by QTH lamps, (2) 1000 nm represents the end of the VNIR channel and is characterised by lower SNR due to low QE compared to the middle of the VNIR detector and in addition displays the highest response to changes in environmental temperatures, (3) 1001 nm is the first band provided by the SWIR I detector and has been found to be radiometrically stable during environmental temperature tests, (4) 1801 nm is the first band of the SWIR II detector and is the most sensitive band of this channel to environmental temperature changes, and (5) 2500 nm is the last band of the SWIR II channel and has typically low SNR values, both in field and laboratory illuminations conditions.…”

Section: Attenuation Repeatabilitymentioning

confidence: 99%

Uncertainty Budget for a Traceable Operational Radiometric Calibration of Field Spectroradiometers, Calibration of the Heliosphere

Werfeli,

Hueni,

Ganeva

et al. 2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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To measure the distinct interaction of the Earth's materials with solar electromagnetic radiation, field spectroradiometers are commonly utilised. These are used to validate spectroradiometers deployed on various platforms through comparison exercises. Following metrology standards, the inclusion of uncertainties is required. Thus, field spectroradiometers need to be calibrated regularly against traceable radiance sources. In this paper we present a laboratory radiometric calibration protocol for the calibration of a Heliosphere integrating sphere to make it traceable to SI as well as establish an uncertainty budget. We adopted a transfer radiometer approach including four spectroradiometers that were calibrated at the DLR RASTA facility before transferring that calibration to the Heliosphere. After considering various sources of uncertainty by employing an uncertainty tree diagram approach we arrive at an overall propagated uncertainty of approximately 1.5%. In a future publication, we will present how to extend the traceability to other attenuations provided by the Heliosphere. Its application to the calibration of a field spectroradiometer will be the focus of a future publication.

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Section: Attenuation Repeatabilitymentioning

confidence: 99%