Photogrammetry: A Powerful Tool for Geometric Analysis of Solar Concentrators and Their Components

[+] Author and Article Information
Klaus Pottler, Eckhard Lüpfert

German Aerospace Center (DLR), Institute of Technical Thermodynamics, Plataforma Solar de Almerı́a, P.O. Box 39, Tabernas, 04200, Spain

Glen H. G. Johnston

Excelsia Accomplis, 31 Neilson St., Garran, ACT 2605, Australia

Mark R. Shortis

Faculty of Engineering, RMIT University, GPO Box 2476V, Melbourne 3001, Australia

J. Sol. Energy Eng 127(1), 94-101 (Feb 07, 2005) (8 pages) doi:10.1115/1.1824109 History: Received May 05, 2004; Revised May 17, 2004; Online February 07, 2005
Copyright © 2005 by ASME
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Space frame of a EuroTrough module with measurement targets on the mirror support points
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Deviations of EuroTrough mirror support points from design heights in mm
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EuroTrough collector element with measurement targets on the concentrator mirrors
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EuroTrough mirror surface. Deviations from the design heights (expanded scale)
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Transversal slope errors (marked as crosses) of neighboring points (marked as dots) in milliradian. Positive values indicate the areas where the reflected rays tend to pass over the focal line
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Site jig at the Plataforma Solar de Almerı́a for the assembly of EuroTrough space frames
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Thermally induced displacements in height (mm) of a EuroTrough construction jig as a function of ambient temperature changes
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Two adjacent EuroTrough facets with 7000 measurement targets as used for the study of the sag
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Shape change caused by gravitational forces for two facets. All pictures scaled uniformly
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Curved, 38 cm square aperture mirror facet
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Curved shape of the mirror facet as calculated from photogrammetric data
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Depth deviation data optimized to a paraboloid having a focal length of 370.4 mm
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Depth deviation data optimized to a sphere having a radius of curvature of 759.3 mm
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Spatial distribution of facet depth deviations from a spherical surface, radius: 759.3 mm
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Frequency distribution of surface normal deviations (slope errors) for the target coordinates across the mirror facet. Solid line shows actual frequency distribution, dashed line shows the best-fit Rayleigh distribution to the data
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Image of the expected light distribution at the 370 mm focal point of the mirror facet
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Surface plot of the focal light distribution shown in Fig. 16
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Percent-power-in-radius plot for the flux distribution shown in Fig. 16




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