Apparatus and method with servo control for the elimination of the output signal of a fiber-optic gyro.

摘要

Setting the driving signal of a phase modulator in the sensing loop of a fiber optic gyroscope to zero for a period of time tau equal to the transit time of the light waves through the gyro causes the gyro to assume a known zero reference state. In this zero reference state the counterpropagating light waves are in phase except for the phase shift caused by rotation of the sensing loop. During this zero reference state, a bias signal for demodulation purposes and a signal that will cause a phase shift equal and opposite to the rotation-induced phase shift are applied to the phase modulator. These signals null the rotation-induced phase shift as seen by a photodetector for a period equal to the transit time.