Multi-Axis Atom Interferometer for Simultaneous Inertial Sensing
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Solution Overview
Problem
Existing atomic interferometers are limited to sequential measurements along single axes, requiring changes in the direction of the optical wave vector k between each measurement cycle, which is inadequate for applications needing simultaneous multi-axis inertial measurements to calculate the trajectory and orientation of a moving object accurately.
Innovation Solution
A multi-axis atomic interferometer system using a time-modulated laser source to generate light pulses that spatially separate and recombine atom clouds along multiple axes, enabling simultaneous measurement of accelerations and rotations in a single cycle through a multidimensional geometry with counter-propagating light beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If atomic interferometers measure acceleration and rotation components sequentially along several axes by changing the direction of the optical wave vector k between each measurement cycle, then multi-axis inertial measurements can be achieved, but the measurements are not simultaneous which causes time delays and calculation errors for trajectory determination
Solution Approach 1:
The patent applies dimensionality change by transitioning from sequential single-axis measurements to simultaneous multi-axis measurements. The atomic interferometer system uses multiple laser beams propagating along different spatial axes (X, Y, Z directions) to create interferometric paths that are sensitive to acceleration and rotation along multiple axes simultaneously. This dimensional expansion of the measurement space allows all six inertial components (three acceleration components and three rotation components) to be measured in parallel rather than sequentially, eliminating time delays while maintaining measurement precision
Solution Approach 2:
The patent implements multi-functionality by designing a single atomic interferometer system that can measure all six inertial components (ax, ay, az, Ωx, Ωy, Ωz) simultaneously using the same atomic cloud and interferometric setup. The system uses time-modulated laser sources to generate multiple beam pairs that interact with the atoms to provide sensitivity along all three spatial axes for both acceleration and rotation measurements, allowing one device to perform what previously required multiple sequential measurement cycles
2Device complexity
If a single atomic source is used to create atom clouds along multiple axes, then device complexity is reduced, but the atom clouds must be spatially separated and recombined along inclined trajectories which increases measurement system complexity
Solution Approach 1:
The patent applies dynamics by using time-modulated laser sources that generate light pulses at specific time intervals to dynamically control the creation, deflection, and recombination of atomic wave packets. The laser pulses are applied at times t, t+T, and t+2T to sequentially perform beam splitting, deflection, and recombination operations. This temporal modulation allows the system to guide atoms along complex inclined trajectories (such as trajectories inclined at 45 degrees between axes) while maintaining precise control, transforming a static geometric problem into a dynamically controllable process
Solution Approach 2:
The patent uses laser beams as intermediaries to manipulate the atomic clouds. The time-modulated laser sources generate light pulses that act as mediators to spatially separate the atomic source into multiple wave packets, deflect them along inclined trajectories, and recombine them at detection points. The laser beams provide the necessary momentum transfer and phase modulation to control the atomic trajectories without requiring direct mechanical manipulation, simplifying the overall system while enabling complex measurement geometries
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 multi-axis inertial measurements, increasing sensitivity and accuracy by allowing simultaneous measurement of acceleration and rotation components without dependence on launch velocity, suitable for inertial navigation applications.
Implementation Method 1
a time-modulated laser source to generate a sequence of light pulses comprising at least a first light pulse incident on the cold atom source... spatially separate the cold atom source into at least a first cloud of atoms propagating along a first trajectory... and a second cloud of atoms propagating along a second trajectory
Implementation Method 2
the coherent manipulation of the atoms in various locations of their trajectory... the second light pulse being adapted to spatially deflect the first trajectory of at least a part of the first atom cloud along the second axis (Y) towards a first point
Implementation Method 3
the first interferometric phase shift being accumulated on the said first and second trajectories between the first light pulse and the last light pulse... enabling simultaneous measurement of acceleration and rotation components
Data Source
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AI summary
The invention relates to a multi-axis atom interferometer system comprising a source (10) of cold atoms, a laser source generating a first light pulse designed to spatially separate the source of cold atoms into a first cloud of atoms (1) propagating along a first trajectory along a first axis (X) and a second cloud of atoms propagating along a second trajectory along a second axis (Y), a second light pulse suitable for spatially deflecting the first trajectory along the second axis (Y) and simultaneously the second trajectory along the first axis (X) towards a first point (51) and a last light pulse suitable for recombining said at least one portion of the first cloud of atoms and said at least one portion of the second cloud of atoms at the first point, and a detection system measuring an interferometric phase shift accumulated between the first light pulse and the last light pulse.