Solar Radiation Measurement and Solar Radiometers

Balenzategui, J.L.; Fabero, F.; Silva, José P.

doi:10.1007/978-3-319-97484-2_2

Cited by 2 publications

(2 citation statements)

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“…In recent years, there have been many technical developments in solar radiometry, revealing an impressive dedication for its correct assessment with increasing accuracy, and the key importance of these measurements along decades. Evolution of instruments and scales in solar irradiance radiometry can be found in the literature [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of absolute cavity radiometers for traceability to SI of solar irradiance

Balenzategui

Lucas²,

Cuenca³

et al. 2022

Meas. Sci. Technol.

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Solar-type Cavity Radiometers are instruments of the highest metrological level for measuring solar Direct Normal Irradiance. To ensure their traceability and performance, they are periodically compared to the World Group of Standards, which realises the World Radiometric Reference (WRR), in the International Pyrheliometer Comparisons (IPC). Additionally, they can be characterized in an absolute way, with direct traceability to SI units and with their measurement uncertainty calculated. This paper describes the different techniques and procedures applied for the characterization and calibration of solar cavity radiometers, with the main results obtained to date in the case of an Automatic Hickey-Frieden (AHF) radiometer. Voltmeters, resistors, temperature sensors and the area of the precision apertures have been calibrated, while the effective absorptance, temperature coefficients, optical scattering and non-equivalence factor have been evaluated. The temperature dependence of the electrical current in the cavity heater has also been analysed. The resulting corrections obtained for the AHF by characterization are compatible with the WRR factors obtained by this instrument in the past IPCs. An uncertainty of 0.42 % (k = 1) has been obtained, and this paper discusses further improvements that may be able to reduce this figure to the desired expanded uncertainty of U = 0.1 % (k = 2).

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Section: Introductionmentioning

confidence: 99%

“…This transfer factor is used as a correction constant by the ACR user to reproduce the irradiance values that WSG would have given in the same location and operating conditions. The WRR scale is later disseminated from ACRs to secondary reference devices, working standards and field sensors, in a hierarchical sequence [17,36].…”

Section: Introductionmentioning

confidence: 99%