Reflectance is dependent on the wavelength, λ, the angle of incidence, (2) θi, between the incoming light and the normal to the mirror surface, and light polarization. The amount of reflected radiance, ρ, is a material property and its angular distribution is a property of the microscopic surface flatness.
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A group of experts in the field of optical mirror reflectance characterization has been working together as members of Task III to create this document of a reflectance measurement guideline for laboratory measurements. This document does not include guidelines for field measurements in solar plants.
This guideline for reflectance characterisation of solar reflectors is published under the framework of the SolarPACES Task III: “Solar Technology and Advanced Applications”.
In spring of 2011, a first interim guideline version on a specified measurement method to obtain solar weighted reflectance and monochromatic specular reflectance values with commercially available instrumentation was created by this small working group and published at the SolarPACES homepage .
The solar weighted specular reflectance, s(SW,θ,), is the relevant parameter to evaluate the CSP reflector material for both, the portion of solar irradiation reflected and the ability to redirect it towards the receiver.
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This can be quantified by the solar-weighted hemispherical reflectance, dependent on the incidence angle. Second, the reflected sunlight needs to be directed to the receiver with minimal loss; this is quantified through the specularity of the reflector (as well as its shape which is not part of this guideline).
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