Single-Vapor-Cell Three-Axis Gyroscope for Compact Rotation Sensing
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Solution Overview
Problem
Existing three-axis gyroscopes require a large volume and high manufacturing costs due to the number of cells needed for accurate three-dimensional measurements.
Innovation Solution
A three-axis gyroscope system utilizing a single vapor cell filled with a specific gas mixture and optical and magnetic field systems to measure rotation rates around three perpendicular axes, minimizing volume and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensor cell systems are used for three-axis measurement, then measurement precision is improved, but device complexity and volume increase
Solution Approach 1:
The patent combines three separate sensor cell systems into a single vapor cell that can simultaneously measure rotation rates around three perpendicular axes. The vapor cell contains a gas mixture with alkali metal atoms and noble gas atoms, where optical pumping creates spin polarization that responds to rotations on all three axes, eliminating the need for multiple separate cells while maintaining measurement precision
Solution Approach 2:
The single vapor cell is designed to perform multiple functions: it measures rotation rates around the X, Y, and Z axes simultaneously using the same physical medium. The optical system and magnetic field system are configured to extract rotation information along all three orthogonal directions from a single cell, making the device more compact and cost-effective
2Measurement precision
If multiple sensor cell systems are used for three-axis measurement, then measurement precision is improved, but manufacturing costs increase
Solution Approach 1:
The patent merges three separate vapor cell assemblies into one unified cell structure, reducing the total number of components that need to be manufactured, assembled, and calibrated. This consolidation directly reduces manufacturing costs while achieving the same three-axis measurement capability through clever use of optical pumping and spin exchange physics
3Device complexity
If a single vapor cell is used for three-axis measurement, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent changes the physical parameters within the single vapor cell to enable three-axis measurement. By adjusting the magnetic field configuration, optical pumping parameters, and gas mixture composition, the cell becomes sensitive to rotations around all three axes simultaneously, maintaining precision without requiring multiple cells
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simultaneous and continuous measurement of rotation rates around three axes with reduced installation volume and manufacturing costs, providing control signals for device alignment and orientation.
Implementation Method 1
Using optical pumping of the alkali metal vapor by the pump beam realigns the spins of the individual alkali metal atoms so that they are in a polarized state, with the spin axis of most of alkali metal atom being aligned along a propagation axis of the pump beam
Implementation Method 2
The first noble gas and/or a second noble gas may be spin polarized via spin-exchange collisions with the optically polarized alkali-metal atoms
Implementation Method 3
The gyroscope system comprises an optical polarization detection system which is configured to measure the polarization of the probe beam that has propagated through the vapor cell, in particular through the gas mixture comprising the first alkali metal, the first noble gas and/or the second noble gas, and to generate a polarization signal based on this measured probe beam
Implementation Method 4
The gyroscope system comprises a magnetic field system configured to provide a static magnetic field, a first oscillating magnetic field and a second oscillating magnetic field
Data Source
Figure 1~2
Figure 3
AI summary
The invention is based on the general idea that only one vapor cell (2) is used to determine a rotation of the gyroscope (1) in relation to three perpendicular axes (13, 14, 15). This allows a simultaneous and/or continuous measurement of the rotation rate around three perpendicular axes (13, 14, 15) of the gyroscope (1) with a minimized volume for installation and/or reduced manufacturing costs.