Löffler, Frank

Lade...
Vorschaubild
Preferred name
Löffler, Frank
Official Name
Löffler, Frank

Einstellungen

Gerade angezeigt 1 - 3 von 3
  • Lade...
    Vorschaubild
    Some of the metrics are blocked by your 
    consent settings
    Item-typ:Veröffentlichung,
      38
  • Lade...
    Vorschaubild
    Some of the metrics are blocked by your 
    consent settings
    Item-typ:Veröffentlichung,
    MICROSCOPE instrument description and validation
    (IOP Publishing, 2022-09-14)
    Liorzou, Françoise
    ;
    Touboul, Pierre
    ;
    Rodrigues, Manuel
    ;
    Métris, Gilles
    ;
    André, Yves
    This paper focuses on the dedicated accelerometers developed for the MICROSCOPE mission taking into account the specific range of acceleration to be measured on board the satellite. Considering one micro-g and even less as the full range of the instrument with an objective of one femto-g resolution, that leads to a customized concept and a high-performance electronics for the sensing and servo-actuations of the accelerometer test-masses. This range and performance directed the payload development plan. In addition to a very accurate geometrical sensor core, a high performance electronics architecture provides the measurement of the weak electrostatic forces and torques applied to the test-masses. A set of capacitive detectors delivers the position and the attitude of the test-mass with respect to a very steady gold-coated cage made in silica. The voltages applied on the electrodes surrounding each test-mass are finely controlled to generate the adequate electrical field and so the electrostatic pressures on the test-mass. This field maintains the test-mass motionless with respect to the instrument structure. Digital control laws are implemented in order to enable instrument operation flexibility and a weak position detector noise. These electronics provide both the scientific data for MICROSCOPE's test of the weak equivalence principle and the input for the satellite drag-free and attitude control system.
    Wissenschaftlicher Artikel
    Band:39
      58  10
  • Lade...
    Vorschaubild
    Some of the metrics are blocked by your 
    consent settings
    Item-typ:Veröffentlichung,
    MICROSCOPE Mission: Final Results of the Test of the Equivalence Principle.
    (American Physical Society, 2022-09-14)
    Touboul, Pierre
    ;
    Métris, Gilles
    ;
    Rodrigues, Manuel
    ;
    Bergé, Joel
    ;
    Robert, Alain
    The MICROSCOPE mission was designed to test the weak equivalence principle (WEP), stating the equality between the inertial and the gravitational masses, with a precision of 10^{-15} in terms of the Eötvös ratio η. Its experimental test consisted of comparing the accelerations undergone by two collocated test masses of different compositions as they orbited the Earth, by measuring the electrostatic forces required to keep them in equilibrium. This was done with ultrasensitive differential electrostatic accelerometers onboard a drag-free satellite. The mission lasted two and a half years, cumulating five months worth of science free-fall data, two-thirds with a pair of test masses of different compositions-titanium and platinum alloys-and the last third with a reference pair of test masses of the same composition-platinum. We summarize the data analysis, with an emphasis on the characterization of the systematic uncertainties due to thermal instabilities and on the correction of short-lived events which could mimic a WEP violation signal. We found no violation of the WEP, with the Eötvös parameter of the titanium and platinum pair constrained to η(Ti,Pt)=[-1.5±2.3(stat)±1.5(syst)]×10^{-15} at 1σ in statistical errors.
    Wissenschaftlicher Artikel
    Band:129
      53  48