Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12666/838
Title: Characterization of absolute cavity radiometers for traceability to SI of solar irradiance
Authors: Balenzategui, José
De Lucas Veguillas, Javier
Cuenca Alba, José
González Leiton, Ana María
Molero García, María
Fabero, Fernando
Silva, J. P.
Mejuto, E.
Muñoz, R.
Arce, A.
Issue Date: 12-Aug-2022
Publisher: IOP Science Publishing
DOI: 10.1088/1361-6501/ac849d
Published version: https://iopscience.iop.org/article/10.1088/1361-6501/ac849d
Citation: Measurement Science and Technology 33(11): 115009
Abstract: 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 realizes the World Radiometric Reference (WRR), in the International Pyrheliometer Comparisons (IPCs). 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).
URI: http://hdl.handle.net/20.500.12666/838
E-ISSN: 1361-6501
ISSN: 0957-0233
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