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Angular rate sensor

  • US RE34,006 E
  • Filed: 01/11/1991
  • Issued: 07/28/1992
  • Est. Priority Date: 05/29/1987
  • Status: Expired due to Term
First Claim
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1. An apparatus for measuring rate of turn, comprising:

  • (A) mounting pedestal;

    (B) common base mounted to said mounting pedestal;

    (C) type one substantially fixed to said common base;

    (D) tyne two substantially fixed to said common base such that vibration effects with said tyne one are virtually cancelled whereas said tyne one and said tyne two act as coaxial tynes of a tuning fork whereas there is virtually no movement in said mounting pedestal;

    (E) drive means associated with said tyne one and said tyne two for oscillating said tyne one and aid tyne two in opposition to one another as in a tuning fork, at a selected frequency in a prescribed direction;

    (F) first pickoff means for sensing relative motion of said tyne one to said tyne two whereas said first pickoff means senses a selected proportion of the motion in the driven oscillating direction as well as a selected proportion of the resultant force motion which is perpendicular to the driven oscillating direction;

    (G) second pickoff means for sensing relative motion of said tyne one to said tyne two whereas said second pickoff means senses a selected proportion of the motion in the driven oscillating direction as well as a selected proportion of the motion in the resultant force direction which is perpendicular to the driven oscillating direction whereas the phase of either the said selected proportion of the motion in the resultant force direction or of said selected proportion of the motion in the driven oscillating direction is opposite to the corresponding selected proportion of said first pickoff means, for sensing any phase difference of said selected frequency related to said first pickoff means, whereas said phase difference corresponds to a measurement of rate of turn of the apparatus.

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