An IMU optical path structure based on multiple metasurfaces

By employing a beam-splitting metasurface and a polarization-conversion beam-splitting metasurface in the optical path of the nuclear magnetic resonance gyroscope IMU, and using a single laser to achieve optical path control, the problems of numerous optical components, large size, and high energy consumption in existing technologies have been solved, thus realizing the miniaturization and improved stability of the IMU system.

CN120333419BActive Publication Date: 2026-07-21BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIHANG UNIV
Filing Date
2025-03-04
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing nuclear magnetic resonance gyroscope (IMU) optical path systems rely on a large number of discrete optical components, resulting in large system size, complex structure, low integration, and increased energy consumption due to the configuration of multiple lasers, which is not conducive to miniaturization and stability.

Method used

An IMU optical path structure based on multiple metasurfaces is adopted, including a beam-splitting metasurface, a polarization conversion beam-splitting metasurface, and a nuclear magnetic resonance gyroscope. Optical path control is achieved using a single laser, and the number of optical components is reduced and the integration is improved through metasurface technology.

Benefits of technology

This has enabled the miniaturization, integration, and improved stability of the IMU system, reduced system power consumption, and simplified the optical path structure.

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Abstract

The application discloses an IMU light path structure based on multiple super surfaces, and the light beam generated by a laser 1 is divided into three mutually perpendicular light beams after the action of a beam splitting super surface 3, and then is converted into circularly polarized light and linearly polarized light by a polarization conversion beam splitting super surface 4, and is used for pumping and detection of a nuclear magnetic resonance gyroscope 5 respectively. The beam splitting super surface 3 is composed of polarization-insensitive cylindrical nanorods, and the incident light is split and corresponding deflection is generated by combining the generalized Snell law. The polarization conversion beam splitting super surface 4 is composed of polarization-sensitive rectangular nanorods and polarization-insensitive cylindrical nanorods, the rectangular nanorods are used for converting linearly polarized light into circularly polarized light, and the cylindrical nanorods maintain the linear polarization characteristics and realize light beam splitting and direction adjustment. The application adopts a single laser configuration, realizes efficient light field regulation and control based on super surfaces, avoids the problem that a traditional IMU light path system depends on multiple lasers, reduces the system volume, complexity and energy consumption, improves the stability and integration, and is suitable for high-precision inertial navigation applications.
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Citation Information

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