Radio Navigationmedium#1165
A ring laser gyro (RLG) differs from a mechanical gyro in that it:
A
Has spinning mass elements
B
Uses the interference of counter-rotating laser beams to sense rotation (Sagnac effect)
CorrectC
Requires gimbals
D
Has a shorter lifespan
Explanation
Ring laser gyros use the Sagnac effect: two counter-rotating laser beams in a closed path create an interference pattern that changes with rotation rate.
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