Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 167, Issue -, Pages 28-52Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2017.03.036
Keywords
Solar reflector; Concentrating solar technology; Reflectance measurement; Spectrophotometer; Reflectometer
Funding
- European Union [609837]
- Spanish government [ENE2014-56079-R]
- Ministerio de Economia y Competitividad (Spanish Ministry of Economy and Competitiveness)
- ERDF funds
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The proper optical characterization of solar reflector materials is a challenging task. Although several commercial instruments exist to measure reflectance, they have been developed for other applications and often do not meet all the specific requirements demanded by the solar thermal industry. In particular, the characterization of solar reflectors involve the complete solar spectral wavelength range, an incidence angle range from near normal to 70 degrees and most importantly a very narrow acceptance angle range from near specular to 20 mrad. The accurate measurement of reflectance as a function of all the previously mentioned parameters has not been commercially implemented. This paper reviews the different alternatives to measure reflector materials, describes reflectance models used to approximate the missing information and presents current research work on prototype reflectometers to fill the gap.
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