Mirror surface check on solar troughs by optical profilometry

Year: 2014

Authors: Sansoni P., Fontani D., Mercatelli L., Jafrancesco D., Sani E., Coraggia S., Meucci M., Marconi L., Toccafondi S.

Autors Affiliation: CNR-INO Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze; Università di Firenze, Dip. di Ingegneria Energetica, via Santa Marta 3, 50139 Firenze

Abstract: Linear parabolic collectors usually need profilometric control since the reflector surface can be imperfectly manufactured. Optical profile assessment is generally addressed to detect small localised defects. The paper proposes two optical devices that were developed simulating profile measurements on linear parabolic mirrors. Solar troughs are employed in thermal plants and concentrating photovoltaic systems. The profilometer examines the reflector surface operating on a plane transversal to the linear axis of the trough collector. Then the detection is repeated displacing the optical device along the linear collector axis. The first profilometer includes a shifted laser source and a target placed at the collector focal distance. The second profilometer has a fixed target and a linear laser source, which is approximately located in the focal position of the solar mirror. Ray-tracing simulations and practical tests are illustrated for both optical devices.(C) 2014 The Authors. Published by Elsevier Ltd.

Conference title:

KeyWords: Mirror surface; Optical metrology; Profilometry
DOI: 10.1016/j.egypro.2014.10.315

Citations: 2
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