Three-axis fiber-optic gyroscope for inclinometry and IMU assembly

Abstract

The invention relates to the field of fiber-optic gyroscopes, in particular to a three-axis fiber-optic gyroscope and an IMU assembly for inclinometry. The IMU assembly comprises an IMU mounting framework, and the outer surface of the IMU mounting framework is provided with three groups of X-axis fiber-optic gyroscopes, Y-axis fiber-optic gyroscopes and Z-axis fiber-optic gyroscopes which are orthogonally distributed, a main board module and a light source driving board are further embedded in the outer circumferential face of one end of the IMU mounting framework, the main board module comprises a main board, a detector used for detecting a light source is connected to the main board through a circuit, the light source driving board and the main board are arranged back to back, and the IMU mounting framework is provided with a fiber coiling space located at the position adjacent to the light source driving board in the axial direction. And an SLD light source and a coupler for splitting light are fixedly arranged in the fiber coiling space. The space layout is reasonable, the structure is compact, the mounting space is saved, the overall size of the gyroscope is reduced, the processing difficulty of structural parts is low, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of fiber optic gyroscopes, in particular to a three-axis fiber optic gyroscope and IMU assembly for inclinometer measurement. Background technique [0002] Fiber optic gyro is a kind of fiber optic sensor that can be used for inclinometers. The working principle of fiber optic gyro is based on the Sagnac effect. The Sagnac effect is a general correlation of light propagating in a closed-loop optical path that rotates relative to inertial space Effect, that is, two beams of light with equal characteristics emitted from the same light source in the same closed optical path propagate in opposite directions and finally converge to the same detection point. Most of the existing mature fiber optic gyro inclinometers are single-axis fiber optic gyroscopes Inclinometer, and the three-axis fiber optic gyro inclinometer is difficult to realize the layout of fiber optic gyroscopes in three different directions on a cyl...

AI Technical Summary

Problems solved by technology

[0002] Fiber optic gyro is a kind of fiber optic sensor that can be used for inclinometers. The working principle of fiber optic gyro is based on the Sagnac effect. The Sagnac effect is a general correlation of light propagating in a closed-loop optical path that rotates relative to inertial space Effect, that is, two beams of light with equal characteristics emitted from the same light source in the same closed optical path propagate in opposite directions and finally converge to the same detection point. Most of the existing mature fiber optic gyro inclinometers are single-axis fiber optic gyroscopes Inclinometer, and the three-axis fiber optic gyro inclinometer is difficult to realize the layout of fiber optic gyroscopes in three different directions on a cylindrical strip space with a small circular cross section. To ensure the accuracy of the fiber optic gyroscope, it must be reasonably arranged Cylindrical strip space, and then to ensure the performance of the fiber optic gyroscope, the structure design of the existing fiber optic gyroscope inclinometer is not reasonable enough, the volume is large, the assembly is cumbersome, and the assembly process is many, which makes the assembly difficult

Images