Using three different approaches, laboratory results were obtained for the mass unbalance of the NASA Gravity Probe B rotors designed to test Einstein's gravitational theory. In the first method, measurements of the precession rate of the spinning rotor are deduced from spin-frequency components of the trapped flux. The other approaches involve the measuring of niobium coating thickness using an electron back-scattering device and the measuring of the periodicities of a tumbling rotor. Assumptions of the methods are discussed, along with reasons for discrepancies among the results.


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    Title :

    Mass unbalance analysis for GP-B rotors


    Contributors:

    Conference:

    AIAA Guidance, Navigation and Control Conference ; 1988 ; Minneapolis, MN, United States


    Publication date :

    1988-01-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




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