Composite gyroscope with high sensitivity in the low-velocity region and no dead zone

In order to solve the problems of low sensitivity for traditional interference fiber-optic gyroscopes at low velocity and the existence of measurement dead zone for slow-light gyro, a composite fiber-optic gyroscope that consists of a Sagnac loop and a resonant loop is proposed in this paper. Since it combines the characteristics of the two gyroscopes, the composite gyro can meet the requirements of high sensitivity at low rotation velocity and no measurement dead zone. Loss has a significant influence on the sensitivity of the gyroscope, while the transmission coefficient also has a certain influence on it. The relative sensitivity in the low-velocity and high-velocity regions can be flexibly adjusted by tuning the length ratio of the Sagnac loop and the resonant loop to meet the practical application requirements. The proposed composite gyroscope can provide potential applications in high precision, miniaturization, and integration of the fiber-optic gyroscope.