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Piezoelectrics and Acoustooptics

A New Method for Six-axis Inertial Measurement Using Cold Atom Interferomenter

Tijing Cai

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

In order to monitor 3 axes rotation and acceleration of vehicle simultaneously,a realization scheme for measuring 6 axes inertial parameters using cold atom interferometry was presented.Through exerting different types and directions Raman pulses on two counterpropagating atomic beams in spatial domain,it achieved beams splitting of cold atom,and multiple sub-interferometers with effective interference plane point to several orientations.The relation between interferometry phase shift and the corresponding inertial parameter was derived,and the measurement principle of each axis rotation and acceleration was deduced through interferometry phase shift.The measurement of x axis acceleration by extending pulse with 45° to x axis and y axis was presented based on 5 axes inertial parameters.By analysing the beam splitting,construction and measurement of the interferometer,it showed this scheme has access to 3 axes of rotation and acceleration.

Related papers

Realization method for measuring gravity and rotation respectively using cold atom interferometry

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Cold atom interferometer is sensitive to both gravity and rotation.In order to measure the two parameters respectively,by exerting several horizontal Raman pulses in multiple time-domains on cold atom clouds,we realize the cold atom splitting was realized,and the difference of atom velocity was increased.Then by extending vertical sequences of Raman pulses to cold atoms,two sub-interferometers with different mean velocity of atoms were achieved.Based on the principle of interferometry phase shift that is related to rotation but not acceleration,two measure methods were presented.One makes the mean horizontal velocity of some atoms zero,the other makes the direction of mean horizontal velocity of two parts opposite.Theory analysis and calculation show that it can measure gravity and rotation respectively based on experiment data.

Journal of Chinese Inertial Technology•Jan 1, 2009•0 citations

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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 1, 2007•1 citation
In order to monitor 3 axes rotation and acceleration of vehicle simultaneously,a realization scheme for measuring 6 axes inertial parameters using cold atom interferometry was presented.Through exerting different types and directions Raman pulses on two counterpropagating atomic beams in spatial domain,it achieved beams splitting of cold atom,and multiple sub-interferometers with effective interference plane point to several orientations.The relation between interferometry phase shift and the corresponding inertial parameter was derived,and the measurement principle of each axis rotation and acceleration was deduced through interferometry phase shift.The measurement of x axis acceleration by extending pulse with 45° to x axis and y axis was presented based on 5 axes inertial parameters.By analysing the beam splitting,construction and measurement of the interferometer,it showed this scheme has access to 3 axes of rotation and acceleration.
Cold atom interferometer is sensitive to both gravity and rotation.In order to measure the two parameters respectively,by exerting several horizontal Raman pulses in multiple time-domains on cold atom clouds,we realize the cold atom splitting was realized,and the difference of atom velocity was increased.Then by extending vertical sequences of Raman pulses to cold atoms,two sub-interferometers with different mean velocity of atoms were achieved.Based on the principle of interferometry phase shift that is related to rotation but not acceleration,two measure methods were presented.One makes the mean horizontal velocity of some atoms zero,the other makes the direction of mean horizontal velocity of two parts opposite.Theory analysis and calculation show that it can measure gravity and rotation respectively based on experiment data.
A point source atom interferometer (PSI) is a device where atoms are split and recombined by applying a temporal sequence of Raman pulses during the expansion of a cloud of cold atoms behaving approximately as a point source. Unlike a conventional light pulse atom interferometer, the PSI can produce a signal that corresponds to multi-axis rotation only, independent of acceleration. In addition, it can be used to measure acceleration along one direction, independent of rotation. Here, we describe a modified PSI that can be used to measure multi-axis rotation and multi-axis acceleration. Specifically, this type of PSI can be used to measure two-axes rotation around the directions perpendicular to the light pulses, as well as the acceleration in all three directions, with only one pair of Raman beams. Using two pairs of Raman beams in orthogonal directions sequentially, such a scheme would enable the realization of a complete atom interferometric inertial measurement unit.
We have developed an atom interferometer providing a full inertial base. This device uses two counterpropagating cold-atom clouds that are launched in strongly curved parabolic trajectories. Three single Raman beam pairs, pulsed in time, are successively applied in three orthogonal directions leading to the measurement of the three axis of rotation and acceleration. In this purpose, we introduce a new atom gyroscope using a butterfly geometry. We discuss the present sensitivity and the possible improvements.
Point source atom interferometry (PSI) uses the velocity distribution in a cold atom cloud to simultaneously measure one axis of acceleration and two axes of rotation from the spatial distribution of interferometer phase in an expanded cloud of atoms. Previously, the interferometer phase has been found from the phase, orientation, and period of the resulting spatial atomic interference fringe images. For practical applications in inertial sensing and precision measurement, it is important to be able to measure a wide range of system rotation rates, corresponding to interferograms with far less than one full interference fringe to very many fringes. Interferogram analysis techniques based on image processing used previously for PSI are challenging to implement for low rotation rates that generate less than one full interference fringe across the cloud. We introduce a new experimental method that is closely related to optical phase-shifting interferometry that is effective in extracting rotation values from signals consisting of fractional fringes as well as many fringes without prior knowledge of the rotation rate. The method finds the interferometer phase for each pixel in the image from four interferograms, each with a controlled Raman laser phase shift, to reconstruct the underlying atomic interferometer phase map without image processing.
Point source atom interferometry (PSI) uses the velocity distribution in a cold atom cloud to simultaneously measure one axis of acceleration and two axes of rotation from the spatial distribution of interferometer phase in an expanded cloud of atoms. Previously, the interferometer phase has been found from the phase, orientation, and period of the resulting spatial atomic interference fringe images. For practical applications in inertial sensing and precision measurement, it is important to be able to measure a wide range of system rotation rates, corresponding to interferograms with far less than one full interference fringe to very many fringes. Interferogram analysis techniques based on image processing used previously for PSI are challenging to implement for low rotation rates that generate less than one full interference fringe across the cloud. We introduce a new experimental method that is closely related to optical phase-shifting interferometry that is effective in extracting rotation values from signals consisting of fractional fringes as well as many fringes without prior knowledge of the rotation rate. The method finds the interferometer phase for each pixel in the image from four interferograms, each with a controlled Raman laser phase shift, to reconstruct the underlying atomic interferometer phase map without image processing.
We investigate the limits of our cold atoms interferometer to rotation and acceleration measurements. In contrast with previous atomic setups, emphasis was placed on the long term stability and compactness of the device through the use of laser cooled atoms, as previously shown with the field of atomic clock. It has been designed to give access to all six axes of inertia (three accelerations and three rotations). The expected improvement in stability will enable to consider applications in inertial navigation, geophysics and tests of general relativity as the equivalence principle or Lense-Thirring effect.