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Enhanced Readout from Spatial Interference Fringes in a Point-Source Cold Atom Inertial Sensor

When the initial size of an atom cloud in a cold atom interferometer is negligible compared to its size after free expansion, the interferometer is approximated to a point-source interferometer and is sensitive to rotational movements by introducing an additional phase shear in the interference sequ...

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Autores principales: Wang, Jing, Tong, Junze, Xie, Wenbin, Wang, Ziqian, Feng, Yafei, Wang, Xiaolong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10255063/
https://www.ncbi.nlm.nih.gov/pubmed/37299797
http://dx.doi.org/10.3390/s23115071
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author Wang, Jing
Tong, Junze
Xie, Wenbin
Wang, Ziqian
Feng, Yafei
Wang, Xiaolong
author_facet Wang, Jing
Tong, Junze
Xie, Wenbin
Wang, Ziqian
Feng, Yafei
Wang, Xiaolong
author_sort Wang, Jing
collection PubMed
description When the initial size of an atom cloud in a cold atom interferometer is negligible compared to its size after free expansion, the interferometer is approximated to a point-source interferometer and is sensitive to rotational movements by introducing an additional phase shear in the interference sequence. This sensitivity on rotation enables a vertical atom-fountain interferometer to measure angular velocity in addition to gravitational acceleration, which it is conventionally used to measure. The accuracy and precision of the angular velocity measurement depends on proper extraction of frequency and phase from spatial interference patterns detected via the imaging of the atom cloud, which is usually affected by various systematic biases and noise. To improve the measurement, a pre-fitting process based on principal component analysis is applied to the recorded raw images. The contrast of interference patterns are enhanced by 7–12 dB when the processing is present, which leads to an enhancement in the precision of angular velocity measurements from 6.3 μrad/s to 3.3 μrad/s. This technique is applicable in various instruments that involve precise extraction of frequency and phase from a spatial interference pattern.
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spelling pubmed-102550632023-06-10 Enhanced Readout from Spatial Interference Fringes in a Point-Source Cold Atom Inertial Sensor Wang, Jing Tong, Junze Xie, Wenbin Wang, Ziqian Feng, Yafei Wang, Xiaolong Sensors (Basel) Communication When the initial size of an atom cloud in a cold atom interferometer is negligible compared to its size after free expansion, the interferometer is approximated to a point-source interferometer and is sensitive to rotational movements by introducing an additional phase shear in the interference sequence. This sensitivity on rotation enables a vertical atom-fountain interferometer to measure angular velocity in addition to gravitational acceleration, which it is conventionally used to measure. The accuracy and precision of the angular velocity measurement depends on proper extraction of frequency and phase from spatial interference patterns detected via the imaging of the atom cloud, which is usually affected by various systematic biases and noise. To improve the measurement, a pre-fitting process based on principal component analysis is applied to the recorded raw images. The contrast of interference patterns are enhanced by 7–12 dB when the processing is present, which leads to an enhancement in the precision of angular velocity measurements from 6.3 μrad/s to 3.3 μrad/s. This technique is applicable in various instruments that involve precise extraction of frequency and phase from a spatial interference pattern. MDPI 2023-05-25 /pmc/articles/PMC10255063/ /pubmed/37299797 http://dx.doi.org/10.3390/s23115071 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Wang, Jing
Tong, Junze
Xie, Wenbin
Wang, Ziqian
Feng, Yafei
Wang, Xiaolong
Enhanced Readout from Spatial Interference Fringes in a Point-Source Cold Atom Inertial Sensor
title Enhanced Readout from Spatial Interference Fringes in a Point-Source Cold Atom Inertial Sensor
title_full Enhanced Readout from Spatial Interference Fringes in a Point-Source Cold Atom Inertial Sensor
title_fullStr Enhanced Readout from Spatial Interference Fringes in a Point-Source Cold Atom Inertial Sensor
title_full_unstemmed Enhanced Readout from Spatial Interference Fringes in a Point-Source Cold Atom Inertial Sensor
title_short Enhanced Readout from Spatial Interference Fringes in a Point-Source Cold Atom Inertial Sensor
title_sort enhanced readout from spatial interference fringes in a point-source cold atom inertial sensor
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10255063/
https://www.ncbi.nlm.nih.gov/pubmed/37299797
http://dx.doi.org/10.3390/s23115071
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