One axis gravity gradiometer for the measurement of Newton?s gravitational constant, G (Articolo in rivista)

Type
Label
  • One axis gravity gradiometer for the measurement of Newton?s gravitational constant, G (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • V. Iafolla, S. Nozzoli, E. Fiorenza (2003)
    One axis gravity gradiometer for the measurement of Newton?s gravitational constant, G
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • V. Iafolla, S. Nozzoli, E. Fiorenza (literal)
Pagina inizio
  • 223 (literal)
Pagina fine
  • 233 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • Nuova metodologia con l'uso di un gradiometro gravitazionale (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 318 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Articolo concernente la misura della costante gravitazionale (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR IFSI (literal)
Titolo
  • One axis gravity gradiometer for the measurement of Newton?s gravitational constant, G (literal)
Abstract
  • This paper presents preliminary works concerning a new technique to measure the gravitational constant G, using a single axis gravity gradiometer designed to detect an off-line component of the gravity gradient tensor and able to reject the linear acceleration due to the vibrational noise (common mode rejection: CMR). The main part of such an instrument is a torsional mechanical oscillator which is forced at the frequency , by means of a gravitational torque produced with a system of two masses rotating at a frequency . The low frequency of the mechanical oscillator, together with a high sensitivity capacitive bridge measurement system, enables the detection of the gravitational signal with high accuracy, also in presence of quite high seismic noise. A precision of one part in in the determination of the gravitational torque was achieved in our laboratory with an integration time of about 5 h and a factor 10 can be easily gained performing the measurement in a place with a lower differential seismic noise. The detection accuracy can be translated into experimental accuracy in the determination of G if the physical parameters of the whole system are measured with the same relative error. The experiment proposed in this paper has strong similarities with the classic torsion balance [1], but it has some peculiarities that make it particularly interesting as follows: the oscillating system is in indifferent equilibrium under the action of the Earth gravity field, so that it can have any orientation with respect to the local vertical; the instrument can also be used in the absence of gravity (free fall experiment); the capacitive bridge pick-up system has a high transducer factor for converting mechanical signals into electrical signals which are much greater than the pre-amplifier noise, even for very small displacements of the oscillator. (literal)
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