Abstract
An inertial sensor with aresolution of 10-12m s-2 Hz－１/２ from 0.1 mHz to 0.1 Hz for ASTROD I is designed. An electrostatic torsion pendulum facility is constructed to investigate the ground-based performance of the inertial sensor. The twist motion of the test mass of the torsion pendulum is monitored by a separated optical lever system and servo-controlled by electrostatic capacitance actuators. The preliminary result shows that the resolution of the electrostatic torsion pendulum comes to 10-11 Nm Hz-1/2 from 0.1 mHz to 0.5 Hz.
