FIBRE-OPTIC GYROSCOPE Russian patent published in 2016 - IPC G01C19/72 

FIELD: optics.

SUBSTANCE: invention relates to fibre optics and can be used in interferometric type fibre-optic gyroscopes. Fibre-optic gyroscope contains located inside protective shield bearing base and fixed on which there are optically connected radiation source, fibre polariser, inlet splitter connected two ports to inputs of photodetectors connected to information processing electronic circuit, integrated optical circuit which includes polariser, splitter and phase modulator, measuring circuit, which is sensitive coil, including frame with optical fibre, which retain polarization, fixed on bearing base and data processing circuit, which data output forms gyroscope data output. Integrated optical circuit is formed in lithium niobate monocrystalline wafer. Integrated optical circuit splitter is made in form of X-splitter, its channel waveguides are formed by diffusion of titanium into lithium niobate plate. Free input arm of integrated optical circuit splitter channel waveguide forms control optical output of integrated optical circuit intended for control of accuracy of attachment of integrated optical circuit with sensitive coil optical fibre. Sensitive coil frame is closed by additional screen of two connected overlapping each other parts covering upper and lower parts of coil frame, each of which is ring-shaped chute, and in its inner space comprises rigidly connected to it, uniformly arranged in circle and resting against upper surface of sensitive coil spring elements, and in lower surface of sensitive coil-spherical supports, while in space between inner surface of hole coil and inner surface of extra shield there is resilient spring.

EFFECT: technical result consists in compensation of optical noise radiation source, as well as reduction of signal drift FOG due to reduced amplitude of waves with non-working polarisation, which provides high accuracy and sensitivity of gyroscope.

1 cl, 2 dwg