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A new method to characterize degradation of first surface aluminium reflectors

Sutter, Florian and Fernandez, Arantxa and Heller, Peter and Kennedy, Cheryl and Meyen, Stephanie and Pitz-Paal, Robert and Schmücker, Martin (2010) A new method to characterize degradation of first surface aluminium reflectors. In: Proceedings of the SolarPACES 2010 conference. Proceedings of the SolarPACES 2010 conference, 21. Sep. - 24. Sep. 2010, Perpignan, Frankreich.

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Abstract

This paper reports the development of a new optical instrument capable of characterizing the aging process of enhanced first surface aluminum reflectors for concentrating solar power (CSP) application. Samples were exposed outdoors at different sites and in accelerated exposure tests. All samples exposed outdoors showed localized corrosion spots. Degradation originated from points of damage in the protective coating, but propagated underneath the protective coating. The degraded samples were analyzed with a microscope and with a newly designed space-resolved specular reflectometer (SR)2 that is capable of optically detecting and characterizing the corrosion spots. The device measures the specular reflectance at three acceptance angles and the wavelengths with spatial resolution using a digital camera’s CMOS sensor. It can be used to measure the corrosion growth rate during outdoor and accelerated exposure tests. These results will allow a correlation between the degraded mirror surface and its specular reflectance.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:A new method to characterize degradation of first surface aluminium reflectors
Authors:
AuthorsInstitution or Email of Authors
Sutter, FlorianFlorian.Sutter@dlr.de
Fernandez, Arantxaarantxa.fernandez@psa.es
Heller, PeterPeter.Heller@dlr.de
Kennedy, CherylCheryl.Kennedy@nrel.gov
Meyen, StephanieStephanie.Meyen@dlr.de
Pitz-Paal, Robertrobert.pitz-paal@dlr.de
Schmücker, MartinMartin.Schmuecker@dlr.de
Date:21 September 2010
Journal or Publication Title:Proceedings of the SolarPACES 2010 conference
Refereed publication:Yes
Status:Published
Keywords:accelerated and outdoor weathering, aging of reflectors, specular reflectance, reflectometer, filiform corrosion of aluminum, soiling
Event Title:Proceedings of the SolarPACES 2010 conference
Event Location:Perpignan, Frankreich
Event Type:international Conference
Event Dates:21. Sep. - 24. Sep. 2010
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Qualifizierung
Location: Köln-Porz
Institutes and Institutions:Institute of Technical Thermodynamics
Deposited By: Florian Sutter
Deposited On:24 Jan 2011 07:38
Last Modified:12 Dec 2013 21:13

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