Measuring spectral diffuse solar irradiance with non-cosine flat-plate diffusers

Casinière, A. de La; Cabot, T.; Benmansour, Saad

doi:10.1016/0038-092x(94)00123-u

Cited by 12 publications

(1 citation statement)

References 15 publications

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“…radiance anisotropy (Gu et al 1992, de la Casiniere et al 1995. No information was available on the angular spectral response of the cosine diffuser fitted to the GER1500, so no correction factor could be applied to the reference sensor data in this experiment.…”

Section: Methodsmentioning

confidence: 98%

Calibration of dual‐beam spectroradiometric data

Anderson

Milton

Rollin

2006

International Journal of Remote Sensing

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An experiment to determine the most accurate and repeatable method for generating instrument inter-calibration functions (ICFs) is described, based upon data collected with a dual-beam GER1500 spectroradiometer system. The quality of reflectance data collected using a dual-beam spectroradiometer system is reliant upon accurate inter-calibration of the sensor pairs to take into account differences in their radiant sensitivity and spectral characteristics. A cos-conical field-based method for inter-calibrating dual-beam spectroradiometers was tested alongside laboratory inter-calibration procedures. The field-based method produced the most accurate results when a field-derived ICF collected close in time was used to correct the spectral scan. A regression model to predict the ICF at a range of wavelengths was tested, using inputs of solar zenith angle, cosine of solar zenith angle and broadband diffuse-to-global irradiance ratios. The linear multiple regression model described up to 78% of the variability in ICF; the remainder of the variability was most likely due to complexities of instrumental behaviour in response to warm-up time, ambient temperature and environmental conditions at the time of measurement. Collection of ICFs using a stable laboratory source was shown to provide unsatisfactory results due to differences between lamp outputs and the field-measured solar spectrum. Consequently, the most practical and accurate method of deriving inter-calibration functions is to use field-derived ICFs, collected close in time and space to the data requiring correction.

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Section: Methodsmentioning

confidence: 98%