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    Slope Error Measurements of Parabolic Troughs Using the Reflected Image of the Absorber Tube

    Source: Journal of Solar Energy Engineering:;2009:;volume( 131 ):;issue: 001::page 11014
    Author:
    Steffen Ulmer
    ,
    Boris Heinz
    ,
    Klaus Pottler
    ,
    Eckhard Lüpfert
    DOI: 10.1115/1.3035811
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A new and 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 toward it. Then, a set of pictures from the absorber tube reflection is taken with slightly different tilt angles of the concentrator. 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, the relative collector tilt angles, 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 in statistical values as well as in local values of the reflector slope. Compared to the existing photogrammetric method, the new technique reduces drastically the time measurement.
    keyword(s): Measurement , Photogrammetry , Reflection , Errors , Shapes , Parabolic troughs , Resolution (Optics) AND Algorithms ,
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      Slope Error Measurements of Parabolic Troughs Using the Reflected Image of the Absorber Tube

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/141963
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    • Journal of Solar Energy Engineering

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    contributor authorSteffen Ulmer
    contributor authorBoris Heinz
    contributor authorKlaus Pottler
    contributor authorEckhard Lüpfert
    date accessioned2017-05-09T00:35:24Z
    date available2017-05-09T00:35:24Z
    date copyrightFebruary, 2009
    date issued2009
    identifier issn0199-6231
    identifier otherJSEEDO-28416#011014_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/141963
    description abstractA new and 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 toward it. Then, a set of pictures from the absorber tube reflection is taken with slightly different tilt angles of the concentrator. 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, the relative collector tilt angles, 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 in statistical values as well as in local values of the reflector slope. Compared to the existing photogrammetric method, the new technique reduces drastically the time measurement.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleSlope Error Measurements of Parabolic Troughs Using the Reflected Image of the Absorber Tube
    typeJournal Paper
    journal volume131
    journal issue1
    journal titleJournal of Solar Energy Engineering
    identifier doi10.1115/1.3035811
    journal fristpage11014
    identifier eissn1528-8986
    keywordsMeasurement
    keywordsPhotogrammetry
    keywordsReflection
    keywordsErrors
    keywordsShapes
    keywordsParabolic troughs
    keywordsResolution (Optics) AND Algorithms
    treeJournal of Solar Energy Engineering:;2009:;volume( 131 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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