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A fiber optic gyro measures rotation using the _______ of the two beams?

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A fiber optic gyro measures rotation using the _______ of the two beams?

(a) Intensity difference

(b) Resonance

(c) Interference intensity

(d) Wavelength difference

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I need to ask this question from Gyroscopes topic in portion Satellite Radio Navigation  & Inertial Navigation of Avionics

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Right choice is (c) Interference intensity

To elaborate: In a fiber optic gyro, The counterpropagating beams are launched into an optical path and are recombined as they exit. The interference generated by the recombination depends on the optical phase difference between the two beams and therefore provides a measure of rotation.

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