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1. (WO1999006842) MULTISENSOR WITH DIRECTLY COUPLED ROTORS

Pub. No.:    WO/1999/006842    International Application No.:    PCT/US1998/014279
Publication Date: Feb 11, 1999 International Filing Date: Jul 8, 1998
IPC: G01C 19/56
Applicants: LITTON SYSTEMS, INC.
Inventors: STEWART, Robert, E.
Title: MULTISENSOR WITH DIRECTLY COUPLED ROTORS
Abstract:
A multisensor includes direct rotor coupling. A pair of rotors (16, 18) is mechanically coupled by a torsion bar (20) whose stiffness largely determines the resonant frequency of the counteroscillating rotor pair. The axis of the torsion bar is coincident with the common axis of rotation of the rotors. Piezo bimorphs (64, 66) are fixed to opposed surfaces of radial vanes (52-62) of the rotors which suspend the torsionally-coupled rotor pair with the case (10), isolating it from external angular vibration that could interfere with the resonant frequency of the rotor pair subassembly. The bimorphs receive signals for driving the oscillations of the rotors. Taken together, the stiffnesses of the vanes and the torsion bar substantially determine the common resonant frequency of the counteroscillating pair of rotors.