The pendulum, with a measured torque noise ﬂoor below 10 fN m/√Hz from 0.6 to 10 mHz, has allowed placement of an upper limit on sensor force noise contributions, measurement of the sensor electrostatic stiffness at the 5% level, and detection and compensation of stray dc electrostatic biases at the millivolt level.
Achieving geodetic motion for LISA test masses: ground testing result
Thus, measurement and balancing of ∆φ looks feasible at the mV level with the torsion pendulum and could provide a valuable ground test of the compensation technique suggested here.
Possibilities for Measurement and Compensation of Stray DC Electric Fields Acting on Drag-Free Test Masses
Consider the spherical pendulum where Q = R3 and S = S 2 with holonomic constraint given by the zero level-set of g (q) = kqk2 − 1.
Stochastic Variational Partitioned Runge-Kutta Integrators for Constrained Systems
The universality of free fall has then been tested to an impressive level of η < 10−13 by Lunar Laser Ranging (Williams et al. 2009) and by torsion pendulum (for a review see Adelberger et al. 2009).
Testing Gravitation in the Solar System with Radio Science experiments
The steering mirrors will be coated for 355 nm and 632 nm reﬂections so that they can be aligned using a HeNe laser device with an internal pendulum level.
Summary Report of JEM-EUSO Workshop at KICP in Chicago
Since the ﬁbre axis is determined by local level at the pendulum site, corrections were needed to account for this gradient in the down direction.
Torsion-balance tests of the weak equivalence principle