Discussion
Assertion (A): A ring laser gyro is dithered mechanically.
Reason (R): Dither prevents the counter-rotating beams from locking together at low rotation rates.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second explains why the dither is needed. Below a threshold rotation rate the counter-propagating beams couple through backscatter and lock to a common frequency, so the gyro reads zero over a small dead band around zero rate.
Dithering oscillates the assembly rapidly through a small angle, keeping the instantaneous rate outside that band, and the known dither is subtracted from the output. It reintroduces one moving part to an otherwise solid state device.
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