Integrated interferometric optical gyroscope, assembly, system, and method for calculating rotational speed

Abstract

The present invention provides an integrated interferometric optical gyroscope, assembly, system, and method for calculating rotational speed, the gyroscope comprising a light source module, a first coupling module, a second coupling module, at least two polarization-separated rotation modules, a photoelectric detection module, and a helical waveguide module, the two polarization-separated rotation modules each connected to the distal and proximal ends of the helical waveguide module, each converting two optical beams in a TE polarization state into two polarization states, TE and TM, transmitting them to both ends of the helical waveguide module, transmitting them in opposite directions within the helical waveguide module, receiving the two optical beams after they have passed through the helical waveguide module, and converting both polarization states back to the same TE mode, the gyroscope does not use a circulator or 50 / 50 coupler, avoids reflected light waves to the light source, and eliminates the influence of system errors, drift or disturbances, changes in ambient temperature, etc. on the performance stability of the gyroscope.

Claims

1. It includes a light source module, a first coupling module, a second coupling module, at least two polarization separation and rotation modules, a photoelectric detection module, and a helical waveguide module. The first coupling module is used to split one light wave beam emitted from the light source module into two light wave beams. The two polarization separation rotation modules are each connected to the distal and proximal ends of the helical waveguide module, and each converts the two optical beams in the TE polarization state into two polarization states, TE and TM, and transmits them to both ends of the helical waveguide module, transmits them in the opposite direction within the helical waveguide module, receives the two optical beams after they have passed through the helical waveguide module, converts both polarization states back to the same TE mode, and returns them. The second coupling module is used to couple the two light wave beams output from the distal end and the proximal end into a single combined light wave. An integrated interferometric optical gyroscope characterized in that the photoelectric detection module is connected to the second coupling module and is used to acquire rotational speed information of the gyroscope based on the combined light wave.

2. The polarization separation rotation module converts two optical beams in TE mode polarization states into a single optical beam in a superposition of TE mode and TM mode polarization states, Alternatively, the polarization separation rotation module converts a single optical beam with a superimposed polarization state of TE mode and TM mode into two optical beams with TE mode polarization states. The gyroscope according to claim 1, characterized in that the helical waveguide module supports the transmission of TE mode and TM mode polarizations, and within the same helical waveguide module, the propagation direction of the TE mode polarized light wave is opposite to the propagation direction of the TM mode polarized light wave.

3. The gyroscope according to claim 1, further comprising a polarization control module connected to at least one polarization separation rotation module for adjusting or controlling the polarization mode of a light wave.

4. The gyroscope according to claim 1, further comprising an adjustable optical attenuation module connected to the second coupling module for adjusting the intensity of optical waves on two interference arms.

5. The gyroscope according to claim 1, further comprising a phase modulation module for modulating the phase of an optical wave, each connected to the first coupling module and at least one polarization-separating rotation module.

6. The gyroscope according to claim 1, further comprising delay lines for delaying light waves, each connected to a light source module and the first coupling module, respectively.

7. The gyroscope according to claim 1, characterized in that a light source module and a photoelectric detection module are provided in both the first coupling module and the second coupling module.

8. An optical gyroscope assembly comprising two gyroscopes according to any one of claims 1 to 7, wherein the propagation directions of the TE mode polarization of the two gyroscopes are opposite, and the propagation directions of the TM mode polarization of the two gyroscopes are opposite.

9. The assembly according to claim 8, characterized in that the connection positions of the light source module and the photoelectric detection module of the two gyroscopes are reversed.

10. The assembly according to claim 8, characterized in that the port directions of the polarization separation rotation modules of the two gyroscopes are different.

11. The assembly according to claim 8 or 10, characterized in that the two gyroscopes share the same light source module, and one light wave beam emitted from the light source module is split into four light wave beams through a coupling module.

12. A method for obtaining rotational speed information via a gyroscope according to any one of claims 1 to 7, and for calculating rotational speed information of a gyroscope, The steps include splitting one light wave beam into two TE modes, The steps include converting the two TE-mode light waves into one TE-mode light wave and one TM-mode light wave, The steps include transmitting the aforementioned one TE mode light wave and the aforementioned one TM mode light wave by a helical waveguide module, The steps include converting one TE-mode light wave and one TM-mode light wave into two TE light waves and combining them into one combined light wave, A method for calculating the rotational speed of a gyroscope, comprising the steps of: calculating light intensity information detected by a photoelectric detection module; and converting the light intensity information into summed phase information to obtain rotational speed information.

13. A method for calculating rotational speed information of a gyroscope assembly, used to acquire rotational speed information via a gyroscope assembly according to any one of claims 8 to 11, In each gyroscope, the steps include converting one light wave beam into two TE-mode light wave beams, The steps include converting the two TE-mode optical beams into one TE-mode optical beam and one TM-mode optical beam, A step of transmitting one TE-mode optical wave beam and one TM-mode optical wave beam, respectively, through two helical waveguide modules of gyroscopes, wherein the TE-mode optical wave and the TM-mode optical wave have opposite directions within the two helical waveguide modules of gyroscopes. The steps include converting one TE-mode optical beam and one TM-mode optical beam into two TE optical beams, and then combining them into one combined optical beam, A method for calculating the rotational speed of a gyroscope, comprising the steps of: calculating first light intensity information detected by the photoelectric detection module of the first gyroscope; converting the first light intensity information into first total phase information; calculating second light intensity information detected by the photoelectric detection module of the second gyroscope; converting the second light intensity information into second total phase information; calculating the average value of the first total phase information and the second total phase information; and obtaining rotational speed information.

14. An interferometric optical gyroscope system comprising peripheral circuits, mechanical packaging components, other optical components, and a gyroscope according to any one of claims 1 to 7 or a gyroscope assembly according to any one of claims 8 to 11, The peripheral circuit includes at least one of a processor, controller, driver, signal collector, calibrator, and temperature sensor. The mechanical packaging component includes at least one of a housing, base, gasket, optical / electrical interface, shock absorber, and MEMS. An interferometric optical gyroscope system characterized in that the other optical components include at least one of a lens, prism, mirror, isolator, optical thin film, optical fiber cable, and interface.

15. The interferometric optical gyroscope system according to claim 14, characterized in that three optical gyroscope systems are arranged in three directions to detect angular velocity information in three directions, and the three optical gyroscope systems and three external acceleration sensors are combined to form an inertial sensor system.

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