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A ring laser gyro senses rotation by

  • A.The deflection of a pendulum
  • B.The change in resistance of a strain gauge
  • C.The frequency difference between counter-rotating laser beams
  • D.The precession of a spinning mass

Answer: C

Rotation makes the two paths differ in effective length, producing a beat frequency proportional to the rate. With no moving parts it has no bearing friction, no spin-up time and none of the drift mechanisms of a mechanical gyro.

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