NMR Gyroscope Vapor Cell Three-Axis Orientation
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Solution Overview
Problem
Current rotation rate sensors, such as MEMS and laser gyroscopes, face challenges in accuracy and cost-effectiveness for various applications, with NMR gyroscopes offering improved accuracy but requiring complex setups and multiple components to determine rotational orientation changes in space.
Innovation Solution
An NMR gyroscope method utilizing a vapor cell filled with a gaseous alkali metal and a gas with non-negligible nuclear spin, applying a static magnetic field and an alternating magnetic field to determine rotational orientation changes in all three spatial directions using a single vapor cell and minimal additional components, allowing for cost and structural volume minimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If NMR gyroscopes use a single vapor cell with minimal additional components, then cost and structural volume are minimized, but the ability to determine rotational orientation changes in all three spatial directions is limited
Solution Approach 1:
The patent makes a single vapor cell perform multiple functions by measuring nuclear spin components in three mutually perpendicular directions (x, y, z). The evaluation unit processes signals from all three directions to determine rotational orientation changes around any axis, making the single cell universal for three-dimensional rotation sensing without requiring multiple separate cells or complex additional components
2Adaptability or versatility
If NMR gyroscopes measure nuclear spin components in three perpendicular directions, then rotational orientation changes in all spatial directions can be determined, but device complexity and cost increase
Solution Approach 1:
The patent combines the measurement of nuclear spin components in three perpendicular directions within a single vapor cell setup. The evaluation unit merges the signals from all three measurement directions to calculate rotational orientation changes, effectively combining multiple measurement functions into one integrated system rather than using separate cells or independent measurement systems
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 accurate determination of rotational orientation changes in all three spatial directions with reduced costs and structural complexity, providing a compact and efficient solution for rotation rate sensing.
Implementation Method 1
applying a static magnetic field in a first direction which corresponds to a polarization direction of the nuclear spins of the second element
Implementation Method 2
A nuclear spin precession of the xenon nuclear spins can be generated around the static magnetic field by means of a static magnetic field in the polarization direction. The precession frequency is in this case the Larmor frequency
Implementation Method 3
If a polarized sample or evaluation laser beam is now irradiated through the vapor cell perpendicularly to the static magnetic field, the polarization of the sample laser beam is rotated periodically at the Larmor frequency due to the Faraday effect
Data Source
AI summary
A method for determining a rotational orientation change using an NMR gyroscope includes making use of a measure of determining, in a vapor cell, which is filled at least with a gaseous first element and a gaseous second element having non-vanishing nuclear spin, a nuclear spin component of the second element in the second direction and a nuclear spin component of the second element in a third direction. The second direction and the third direction are perpendicular to a first direction, which corresponds to the direction of the static magnetic field and to the polarization direction of the nuclear spin of the second element. Moreover, the second direction corresponds to the direction of an applied alternating magnetic field, the frequency of which corresponds to the Larmor frequency of the Larmor precession of the nuclear spin of the second element about the static magnetic field.