Scientific Results

Approaching Free Fall on Two Degrees of Freedom: Simultaneous Measurement of Residual Force and Torque on a Double Torsion Pendulum

Year: 2016

Authors: Bassan M., Cavalleri A., De Laurentis M., De Marchi F., De Rosa R., Di Fiore L., Dolesi R., Finetti N., Garufi F., Grado A., Hueller M., Marconi L., Milano L., Pucacco G., Stanga R., Visco M., Vitale S., Weber W.J.

Autors Affiliation: Dipartimento di Fisica, Università di Roma Tor Vergata, Roma, I-00133, Italy; INFN – Sezione Roma2, Roma, I-00133, Italy; CNR-Istituto di Fotonica e Nanotecnologie, Fondazione Bruno Kessler, Povo (TN), 38123, Italy; Dipartimento di Fisica, Università di Trento, Povo (TN), I-38050, Italy; INFN, TIFPA, Povo (TN), 38050, Italy; Dipartimento di Fisica, Università di Napoli Federico II, Napoli, I-80126, Italy; INFN – Sezione di Napoli, Napoli, I-80126, Italy; Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell

Abstract: A torsion pendulum with 2 soft degrees of freedom (DOFs), realized by off-axis cascading two torsion fibers, has been built and operated. This instrument helps characterize the geodesic motion of a test mass for LISA Pathfinder or any other free-fall space mission, providing information on cross talk and other effects that cannot be detected when monitoring a single DOF. We show that it is possible to simultaneously measure both the residual force and the residual torque acting on a quasifree test mass. As an example of the investigations that a double pendulum allows, we report the measurement of the force-to-torque cross talk, i.e., the amount of actuation signal, produced by applying a force on the suspended test mass, that leaks into the rotational DOF, detected by measuring the corresponding (unwanted) torque.


Volume: 116 (5)      Pages from: 051104-1  to: 051104-5

KeyWords: Crosstalk; Degrees of freedom (mechanics); Mechanics; Space probes; Torque; Torsional stress, Actuation signals; Degrees of freedom (DoFs); Double pendulum; LISA Pathfinder; Residual forces; Simultaneous measurement; Torsion pendulum; Two degrees of freedom, Pendulums
DOI: 10.1103/PhysRevLett.116.051104

Citations: 13
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