Two methods for measuring thermal distortion of antenna dishes under simulated space conditions are described:PhotogrammetryHolographyWith modern photogrammetry an absolute resolution of 20 μm at 1 σ for antenna dishes with a diameter of 1 to 3 m can be achieved. Statistical methods are used to evaluate the 10 to 30 pictures of the test item which are taken from different positions.Double exposure holography has as an interferometric method a much higher resolution in the order of 20 nm to 100μm. But only differences between two shapes will be measured and only in one direction.Both methods are used in our space simulation facility WSA/TVA and several tests are successfully performed.


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    Title :

    Distortion Measurements on Antenna Dishes Under Space Simulation Conditions


    Additional title:

    Sae Technical Papers


    Contributors:
    Frey, H. U. (author)

    Conference:

    International Conference On Environmental Systems ; 1997



    Publication date :

    1997-07-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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