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Slope Measurements of Parabolic Dish Concentrators Using Color Codified Targets

Ulmer, Steffen und Heller, Peter und Reinalter, Wolfgang (2008) Slope Measurements of Parabolic Dish Concentrators Using Color Codified Targets. Journal of Solar Energy Engineering, Volume (Issue ).

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A new fast and highly accurate method for measuring the slope errors of parabolic dish concentrators has been developed. This method uses a flat target with colored stripes placed close to the focal plane of the concentrator and a digital camera located at an observation point on the optical axis at some distance from it. A specially developed image analysis algorithm detects the different colors of the images of the reflection of the target in the concentrator and assigns them their known position on the color target. This information, along with the geometry of the measurement setup and the theoretical parabolic shape of the concentrator, is used to calculate the normal vectors of the concentrator surface. From these normal vectors the radial and tangential slopes can be calculated and compared to the design values of the concentrator. The resulting slope errors not only give the total concentrator error for general characterization of the dish, but also indicate systematic errors from fabrication and installation with a high spatial resolution. In order to verify the quality of the results obtained, a ray-tracing code was developed that calculates the flux distribution on planes perpendicular to the optical axis. Measured slope errors of a 8.5m dish concentrator are presented and the calculated flux distributions are compared to measured flux distributions. The comparison shows excellent agreement in the flux distribution on the absorber plane. This verifies the promising potential of this fast and highly precise new method for measuring imperfections in dish concentrator shape.

Titel:Slope Measurements of Parabolic Dish Concentrators Using Color Codified Targets
AutorenInstitution oder E-Mail-Adresse der Autoren
Datum:Februar 2008
Erschienen in:Journal of Solar Energy Engineering
Stichwörter:Parabolic Dish, Slope Error, Distant Observer, Color Target, Ray-tracing, Optical Measurement, Shape Measurement
HGF - Forschungsbereich:Energie
HGF - Programm:Erneuerbare Energie
HGF - Programmthema:E SF - Solarforschung (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SF - Solarforschung
DLR - Teilgebiet (Projekt, Vorhaben):E - Qualifizierung (alt)
Standort: andere
Institute & Einrichtungen:Institut für Technische Thermodynamik > Solarforschung
Hinterlegt von: Dr.-Ing. Steffen Ulmer
Hinterlegt am:18 Feb 2008
Letzte Änderung:12 Dez 2013 20:29

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