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Twice spin frequency rotating filter

  • US 4,126,046 A
  • Filed: 12/08/1977
  • Issued: 11/21/1978
  • Est. Priority Date: 02/08/1976
  • Status: Expired due to Term
First Claim
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1. In a tuned inertial sensor having a shaft supported from a frame by at least one bearing for rotation about a spin axis at a predetermined spin speed and a sensitive element and a sensitive element support system coupling the sensitive element to the shaft so as to allow relative motion between the sensitive element and the shaft, apparatus for reducing the inertial sensor sensitively to twice spin speed angular vibrations comprising:

  • a filter rotor means disposed substantially coaxial with said spin axis; and

    spring suspension means for coupling said filter rotor to said shaft so as to rotate therewith, said spring suspension means being a means for allowing spring restrained rotation of said filter rotor with respect to said shaft about axes perpendicular to said spin axis, the combination of said filter rotor means and said spring suspension means being tuned so that one of the natural frequencies of said filter rotor about axes perpendicular to said spin axis is substantially equal to twice spin speed when said shaft and said filter rotor means are rotating at spin speed, said one of the natural frequencies of said filter rotor being uncaged and substantially undamped.

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