Results of the IX International Spectroradiometer Intercomparison and impact on precise measurements of new photovoltaic technologies

Pavanello, Diego; Galleano, Roberto; Zaaiman, W.; Ankit, M.; Kouremeti, Natalia; Gröbner, Julian; Hoogendijk, Kees; Pó, Mário; Lisbona, Emilio Fernandez; Alius, Winfried; Dosenicova, D.; Ingo, Kroeger; Friedrich, Dirk; Haverkamp, E.J.; Minuto, A.; Celi, E.; Pravettoni, Mauro; Bellenda, Giovanni; Fucci, R.

doi:10.1002/pip.3347

Cited by 4 publications

(6 citation statements)

References 11 publications

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“…The customary traceability chain of a spectroradiometer usually involves calibration through lamps (e.g., in the laboratory), followed by independent comparison with a reference instrument (in the field). However, as shown by previous studies [67][68][69], incandescence lamps, such as those used in our current setup, are not the best way to calibrate the AvaSpec. Indeed, their emittance in the UV region is very low, and the sensitivity of the array spectroradiometer in the same range is also very weak; therefore, only low and noisy signals are expected.…”

Section: Absolute Irradiance Calibrationmentioning

confidence: 78%

“…Similar methods were employed in previous studies [49,78]. Indeed, as discussed in Section 3.1.5, the use of incandescence lamps to calibrate array spectroradiometers in regions of weak sensitivity, such as UV and IR [68,69], is problematic with our current system. The latter can certainly be improved in the future, e.g., by employing optical cut-off filters [16,48,67], and thus reducing the infrared component of the irradiance, or even by using completely different light sources, such as LEDs [79] (stability requirements in absolute calibrations would exclude deuterium lamps from the choice [22]).…”

Section: Discussionmentioning

confidence: 99%

“…The following supporting information can be downloaded at: https: //www.mdpi.com/article/10.3390/en16072998/s1, Table S1: Non-exhaustive list of previous studies involving array spectroradiometers; Figure S1 [3,7,11,16,23,28,29,48,[66][67][68][69]73,[81][82][83][84][85][86][87][88][89][90][91][92][93][94].…”

Section: Supplementary Materialsmentioning

confidence: 99%

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Characterisation and Field Test of a Simple AvaSpec Array Spectroradiometer for Solar Irradiance Measurements at an Alpine Site

2023

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Array spectroradiometers are increasingly being used to measure natural and artificial optical radiation because of their many advantages compared to traditional instruments. This study aims to thoroughly characterise a commercially available, cost-effective array device (AvaSpec ULS2048-LTEC) and compare its measurements of global solar irradiance in the 290–1100 nm wavelength range with those collected during three short-term field campaigns from more advanced, or specifically designed instruments. Moreover, the AvaSpec observations were compared with the output of a radiative transfer model. The results show that, despite its conceptually simple instrumental design, the AvaSpec can provide measurements of nearly comparable quality to those from reference instruments (e.g., UV index and global horizontal irradiance generally within ±5%) if all corrections are performed. These preliminary observations will be the basis of a long-term series at the Aosta–Saint-Christophe observatory, which can be employed to study solar energy production, biological effects and atmospheric composition changes in the Alpine environment. All procedures, including the encountered issues and proposed solutions, are described in detail.

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Section: Absolute Irradiance Calibrationmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

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Characterisation and Field Test of a Simple AvaSpec Array Spectroradiometer for Solar Irradiance Measurements at an Alpine Site

2023

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“…The uncertainty in spectroradiometer measurements varies as a function of wavelength range and sensor design; representative values can be found in [ 118 ] and [ 119 ]. Since 2011, measurement accuracy among manufacturers has been verified annually in the International Spectroradiometer Intercomparison 120 . In field operation, the sensors require periodic re-calibration 121 and maintenance to remove soiling and verify temperature stability.…”

Section: Measurement Accuracy and Uncertaintymentioning

confidence: 99%

Impact of measured spectrum variation on solar photovoltaic efficiencies worldwide

Kinsey¹,

Riedel

Alonso-Abellá

et al. 2022

Renewable Energy

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“…By attaching a collimation tube to the sensor head, the instrument Field of View (FOV) can be narrowed to a 5 • , and, when assembled on a solar tracker, it can measure the spectral DNI. The instrument measures in the 300-1100 nm spectral range with a bin width of 0.4 nm and a bandpass of nominally <7 nm (defined as the full width at half maximum (FWHM)) [38,39]. The instrument was installed on an EKO sun-tracker STR-21G-S2.…”

Section: Eko Ms-711 Spectroradiometermentioning

confidence: 99%

Water Vapor Retrievals from Spectral Direct Irradiance Measured with an EKO MS-711 Spectroradiometer—Intercomparison with Other Techniques

et al. 2021

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Precipitable water vapor retrievals are of major importance for assessing and understanding atmospheric radiative balance and solar radiation resources. On that basis, this study presents the first PWV values measured with a novel EKO MS-711 grating spectroradiometer from direct normal irradiance in the spectral range between 930 and 960 nm at the Izaña Observatory (IZO, Spain) between April and December 2019. The expanded uncertainty of PWV (UPWV) was theoretically evaluated using the Monte-Carlo method, obtaining an averaged value of 0.37 ± 0.11 mm. The estimated uncertainty presents a clear dependence on PWV. For PWV ≤ 5 mm (62% of the data), the mean UPWV is 0.31 ± 0.07 mm, while for PWV > 5 mm (38% of the data) is 0.47 ± 0.08 mm. In addition, the EKO PWV retrievals were comprehensively compared against the PWV measurements from several reference techniques available at IZO, including meteorological radiosondes, Global Navigation Satellite System (GNSS), CIMEL-AERONET sun photometer and Fourier Transform Infrared spectrometry (FTIR). The EKO PWV values closely align with the above mentioned different techniques, providing a mean bias and standard deviation of −0.30 ± 0.89 mm, 0.02 ± 0.68 mm, −0.57 ± 0.68 mm, and 0.33 ± 0.59 mm, with respect to the RS92, GNSS, FTIR and CIMEL-AERONET, respectively. According to the theoretical analysis, MB decreases when comparing values for PWV > 5 mm, leading to a PWV MB between −0.45 mm (EKO vs. FTIR), and 0.11 mm (EKO vs. CIMEL-AERONET). These results confirm that the EKO MS-711 spectroradiometer is precise enough to provide reliable PWV data on a routine basis and, as a result, can complement existing ground-based PWV observations. The implementation of PWV measurements in a spectroradiometer increases the capabilities of these types of instruments to simultaneously obtain key parameters used in certain applications such as monitoring solar power plants performance.

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Results of the IX International Spectroradiometer Intercomparison and impact on precise measurements of new photovoltaic technologies

Cited by 4 publications

References 11 publications

Characterisation and Field Test of a Simple AvaSpec Array Spectroradiometer for Solar Irradiance Measurements at an Alpine Site

Characterisation and Field Test of a Simple AvaSpec Array Spectroradiometer for Solar Irradiance Measurements at an Alpine Site

Impact of measured spectrum variation on solar photovoltaic efficiencies worldwide

Water Vapor Retrievals from Spectral Direct Irradiance Measured with an EKO MS-711 Spectroradiometer—Intercomparison with Other Techniques

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