Precise knowledge of the optical properties of the components used in the solar field of concentrating solar thermal power plants is primordial to ensure their optimum power production. Those properties are measured and evaluated by different techniques and equipment, in laboratory conditions and/or in the field. Standards for such measurements and international consensus for the appropriate techniques are in preparation. The reference materials used as a standard for the calibration of the equipment are under discussion. This paper summarizes current testing methodologies and guidelines for the characterization of optical properties of solar mirrors and absorbers.

1.
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” (
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” (
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17.
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(
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29.
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,
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32.
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33.
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34.
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,
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2016
).
35.
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” (
1992
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36.
IEC, Standard 60904-3
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” (Withdrawn) (
2008
).
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