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Which of the following type of gyro works by counting the nodes of standing waves of laser beams?

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Which of the following type of gyro works by counting the nodes of standing waves of laser beams?

(a) Ring laser gyro

(b) Optical fiber gyro

(c) Dry tuned gyro

(d) Floated gyro

The question was asked during a job interview.

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

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Correct choice is (a) Ring laser gyro

Explanation: In a Ring laser gyro, the counterpropagating beams form resonant nodes within the gyro cavity and create an electromagnetic standing wave that remains fixed with inertial space. When the housing of the gyro rotates, a detector can count nodes of the standing waves, each of which represents an angle.

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