Aaron J. Swank, K. Sun, D. DeBra
Dec 8, 2006
Journal name not available for this finding
The acceleration generated by the gradient of the mass attraction field between the spacecraft and proof mass is one parameter critical to drag‐free performance. The gravitational self‐attraction properties between two distributed bodies is characterized by the mass, mass center and moment of inertia for each body. Mass property measurements can therefore be used to indirectly measure the mass attraction properties. Since the ultimate goal is to demonstrate the ability to predict the system gravitational mass attraction force and force gradients to a precision below that of the LISA requirements, the corresponding properties of mass, mass center, and moment of inertia must be precisely determined for the proof mass and satellite components. This work introduces a new method for measuring the moment of inertia using a novel five‐wire torsion pendulum, which reduces errors due to translational degrees of freedom. The five‐wire pendulum is integrated with optical angular sensing using diffraction grating ang...