Pulsed optical pumping in electron spin vapor

Pei, Hongyu; Pang, Haoying; Quan, Wei; Fan, Wenfeng; Yuan, Linlin; Zhang, Kai; Fang, Chi

doi:10.1016/j.measurement.2024.114619

Cited by 7 publications

(1 citation statement)

References 37 publications

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“…Despite this, traditional SQUID-MEG has some limitations, such as increased stand-off distance between sensors and the brain, and its fixed helmet constrains the subjects. Recently, quantum sensing has found applications in various fields, including inertial measurement, the detection of extremely-weak magnetic fields, and notably in MEG detection [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Decoding N400m Evoked Component: A Tutorial on Multivariate Pattern Analysis for OP-MEG Data

Wu,

Wang,

et al. 2024

Bioengineering

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Multivariate pattern analysis (MVPA) has played an extensive role in interpreting brain activity, which has been applied in studies with modalities such as functional Magnetic Resonance Imaging (fMRI), Magnetoencephalography (MEG) and Electroencephalography (EEG). The advent of wearable MEG systems based on optically pumped magnetometers (OPMs), i.e., OP-MEG, has broadened the application of bio-magnetism in the realm of neuroscience. Nonetheless, it also raises challenges in temporal decoding analysis due to the unique attributes of OP-MEG itself. The efficacy of decoding performance utilizing multimodal fusion, such as MEG-EEG, also remains to be elucidated. In this regard, we investigated the impact of several factors, such as processing methods, models and modalities, on the decoding outcomes of OP-MEG. Our findings indicate that the number of averaged trials, dimensionality reduction (DR) methods, and the number of cross-validation folds significantly affect the decoding performance of OP-MEG data. Additionally, decoding results vary across modalities and fusion strategy. In contrast, decoder type, resampling frequency, and sliding window length exert marginal effects. Furthermore, we introduced mutual information (MI) to investigate how information loss due to OP-MEG data processing affect decoding accuracy. Our study offers insights for linear decoding research using OP-MEG and expand its application in the fields of cognitive neuroscience.

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Section: Introductionmentioning

confidence: 99%

Decoding N400m Evoked Component: A Tutorial on Multivariate Pattern Analysis for OP-MEG Data

Wu,

Wang,

et al. 2024

Bioengineering

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In Situ Measurement of the Non‐Orthogonal Angles of Magnetic Field Coils Based on Single‐Beam Magnetic Resonance

Liu,

Dong,

et al. 2024

Adv Quantum Tech

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This work proposes a novel method for in situ measurement of the non‐orthogonal angles of magnetic field coils based on single‐beam magnetic resonance. The orthogonality of magnetic field coils is crucial for ensuring the accuracy of atomic magnetometers. The theoretical principles are derived to establish a measurement method for the non‐orthogonal angles. The proposed method requires only one single beam of light to perform in situ measurements of non‐orthogonal angles in the YZ and XZ directions. The experimental results demonstrate that the angle between the Y and Z coils is 89.3001 ± 0.0045°, a value that remains stable despite variations in experimental parameters such as temperature and light power, thereby confirming the robustness of the method. Additionally, the measured gyromagnetic ratio is 6.9963 ± 0.0005 Hz nT−1, which closely matches the theoretical value of 6.9958 Hz nT−1, further validating the method's accuracy. The proposed method provides a more straightforward approach and has significant potential for widespread application across various atomic magnetometers, especially in miniaturized configurations. Furthermore, this method may be extended to the field of atomic gyroscopes.

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Evaluating the performance of optically pumped magnetometer magnetoencephalography in measuring inter-trial and inter-region phase-locking value

Ma,

Gao,

Liang

et al. 2024

Measurement

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Pulsed optical pumping in electron spin vapor

Cited by 7 publications

References 37 publications

Decoding N400m Evoked Component: A Tutorial on Multivariate Pattern Analysis for OP-MEG Data

Decoding N400m Evoked Component: A Tutorial on Multivariate Pattern Analysis for OP-MEG Data

In Situ Measurement of the Non‐Orthogonal Angles of Magnetic Field Coils Based on Single‐Beam Magnetic Resonance

Evaluating the performance of optically pumped magnetometer magnetoencephalography in measuring inter-trial and inter-region phase-locking value

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