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Which type of gyros works by calculating the difference in time taken by light to travel in a closed circle?

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Which type of gyros works by calculating the difference in time taken by light to travel in a closed circle?

(a) Ring laser gyro

(b) MEMS gyro

(c) Floated gyro

(d) Dry tuned gyro

I had been asked this question in an online interview.

The query is from Gyroscopes topic in division Satellite Radio Navigation  & Inertial Navigation of Avionics

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The correct option is (a) Ring laser gyro

Explanation: Optical gyroscopes such as the ring laser gyro and the fibre optic gyro measure angular rate of rotation by sensing the resulting difference in the transit times for laser light waves travelling around a closed path in opposite directions.

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