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A dither mechanism is applied to a ring laser gyro to overcome

  • A.Thermal expansion of the block
  • B.Loss of laser power
  • C.Magnetic interference
  • D.Lock-in at very low rotation rates

Answer: D

At low rates the two beams couple and their frequencies lock together, so small rotations go undetected. Mechanically dithering the block keeps the instantaneous rate away from that dead band while averaging to zero over time.

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