Magneto-optic fiber sagnac interferometer gyro.

摘要

An interferometer gyroscope includes a multiturn optical fiber together with apparatus for producing therefrom a light beam containing a sagnac phase shift relatable to the rate of rotation of the coil about an axis of rotational sensitivity. An electrical coil is provided adjacent the optical fiber to generate a magnetic field parallel to the optical fiber to induce a Faraday effect into the optical fiber. A servo apparatus responsive to the sagnac phase shift is provided to adjust the current in the electrical coil. The servo is operative to null the sagnac phase shift in the optical fiber by balancing the Faraday effect and the sagnac effect in the optical fiber, whereby the current in the coil is proportional to the rate of rotation of the waveguide when the sagnac phase shift is nulled.