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Slope error measurements of parabolic troughs using the reflected image of the absorber tube

Ulmer, Steffen and Heinz, Boris and Pottler, Klaus and Lüpfert, Eckhard (2006) Slope error measurements of parabolic troughs using the reflected image of the absorber tube. In: 13th International Symposium. Concentrated Solar Power and Chemical Energy Technologies, 2006-06-20 - 2006-06-23, Seville (Spain). ISBN 84-7834-519-1

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Abstract

A new fast method for optically measuring the reflector slope of parabolic troughs with high accuracy has been developed. It uses the reflection of the absorber tube in the concentrator as seen from some distance and is therefore called “absorber reflection method”. A digital camera is placed at a distant observation point perpendicular to the trough axis with the concentrator orientated towards it. Then, a set of pictures from the absorber tube reflection is taken with the concentrator in slightly different tilt angles. A specially developed image analysis algorithm detects the edges of the absorber tube in the reflected images. This information, along with the geometric relationship between the components of the set-up and the known approximately parabolic shape of the concentrator, is used to calculate the slopes perpendicular to the trough axis. Measurement results of a EuroTrough segment of four facets are presented and verified with results from a reference measurement using high-resolution close-range photogrammetry. The results show good agreement as well in statistical values as in local values of the reflector slope. In contrast to the photogrammetric data acquisition method, the new technique allows for drastically reduced measurement time.

Item URL in elib:https://elib.dlr.de/44634/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Slope error measurements of parabolic troughs using the reflected image of the absorber tube
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ulmer, SteffenUNSPECIFIEDUNSPECIFIED
Heinz, BorisTechnische Universität MünchenUNSPECIFIED
Pottler, KlausUNSPECIFIEDUNSPECIFIED
Lüpfert, EckhardUNSPECIFIEDUNSPECIFIED
Date:20 June 2006
Journal or Publication Title:13th International Symposium
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
SolarPACES, UNSPECIFIED
ISBN:84-7834-519-1
Status:Published
Keywords:Parabolic Trough, Slope Error, Distant Observer, Photogrammetry, Absorber Reflection Method, Deflectometry
Event Title:Concentrated Solar Power and Chemical Energy Technologies
Event Location:Seville (Spain)
Event Type:international Conference
Event Dates:2006-06-20 - 2006-06-23
Organizer:SolarPACES
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: other
Institutes and Institutions:Institute of Engineering Thermodynamics > Solar Research
Institute of Engineering Thermodynamics
Deposited By: Pottler, Dr.rer.nat. Klaus
Deposited On:27 Sep 2006
Last Modified:12 Dec 2013 20:20

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