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Validation of two Optical Measurement Methods for the Qualification of the Shape Accuracy of Mirror Panels for Concentrating Solar Systems

März, Tobias and Prahl, Christoph and Ulmer, Steffen and Wilbert , Stefan and Weber , Christian (2011) Validation of two Optical Measurement Methods for the Qualification of the Shape Accuracy of Mirror Panels for Concentrating Solar Systems. Journal of Solar Energy Engineering, 133. DOI: 10.1115/1.4004240.

Full text not available from this repository.

Abstract

The solar field is the major cost component of a solar thermal power plant and the optical quality of the concentrators has a significant impact on the field efficiency and thus on the performance of the power plant. Measuring slope deviations in the parabolic shape of the mirror panels in the accuracy and resolution required for these applications is a challenge as it is not required with the same characteristics in other industries. Photogrammetry and deflectometry are two optical measurement methods that are typically used to measure this shape accuracy of mirror panels used in CSP applications. They have been compared and validated by measuring a typical mirror panel under optimal conditions. Additionally, a flat water surface has been measured as an absolute reference object using deflectometry. The remaining deviations between the results of both methods and to the reference object are discussed and possible sources of errors during the measurement are identified. A detailed error analysis is conducted for both methods and compared to the experimental findings. The results show that both methods allow for surface slope measurement with the necessary accuracy for present CSP applications and that among the two, deflectometry exhibits advantages in speed, measurement accuracy and spatial resolution. However, for obtaining correct results several sources of errors have to be addressed appropriately during measurement and post-processing

Document Type:Article
Title:Validation of two Optical Measurement Methods for the Qualification of the Shape Accuracy of Mirror Panels for Concentrating Solar Systems
Authors:
AuthorsInstitution or Email of Authors
März, TobiasUNSPECIFIED
Prahl, ChristophUNSPECIFIED
Ulmer, SteffenUNSPECIFIED
Wilbert , StefanUNSPECIFIED
Weber , ChristianUNSPECIFIED
Date:August 2011
Journal or Publication Title:Journal of Solar Energy Engineering
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:133
DOI:10.1115/1.4004240
Status:Published
Keywords:Solar concentrator, shape accuracy, optical quality, optical measurement, deflectometry, photogrammetr
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Qualifizierung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research
Deposited By: Christoph Prahl
Deposited On:15 Dec 2011 14:26
Last Modified:07 Feb 2013 20:34

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