Angular rate sensor system

  • US 4,654,663 A
  • Filed: 11/16/1981
  • Issued: 03/31/1987
  • Est. Priority Date: 11/16/1981
  • Status: Expired due to Term
First Claim
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1. An angular rate sensor system comprising:

  • (a) a tuning fork formed from a single crystal of piezoelectric material, said tuning fork having two tines and a common shaft disposed in a plane, said common shaft serving as an output shaft, said tuning fork providing a balanced resonant sensor responsive solely to a component of angular motion about the longitudinal axis of the output shaft, causing a torsional deflection of said output shaft(b) driving means coupled to said tines for causing them to vibrate at a drive frequency(c) electrode means, responsive to piezeoelectric signals, positioned on said tuning fork for sensing said piezoelectric signals representative of the angular rate of motion about said axis to which said system is subjected and(d) output means including a phase detector for said piezeoelectric signals and means for generating an output signal indicative of the angular rate of motion.

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