A method for calibrating coil constants by using the free induction decay of noble gases

Chen, Linlin; Zhou, Binquan; Lei, Guanqun; Wu, Wenfeng; Wang, Jing; Zhai, Yueyang; Wang, Zhuo; Fang, Jiancheng

doi:10.1063/1.4985742

Cited by 27 publications

(12 citation statements)

References 22 publications

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“…Without an atomic group with coherent phases, the total gas sample cannot produce a measurable signal. Thus, we apply alternating excitation magnetic fields, 2B1sin(γB0t), along the X-axis, which can be decomposed into a left-hand circular polarization field and a right-hand circular polarization field [12]. The circular polarization field with the same precession direction as Larmor precession is selected to establish the rotating coordinate system X1Y1Z, and then the alternating excitation magnetic field becomes a constant static magnetic field in the rotating coordinate system.…”

Section: Vapor Cell Testing Theory and Visual Simulationmentioning

confidence: 99%

“…The rotation of the macroscopic magnetic moment is determined by the switch of the rotation field, that is, the alternating excitation magnetic field, which is called a pulse. Since the rotation angle of the macroscopic magnetic moment is 90°, this pulse is also called the sans-serifπ/2 pulse [12,17]. According to the formula of rotation, we can obtain sans-serifγB1tsans-serifπ/2=sans-serifπ/2,…”

Section: Vapor Cell Testing Theory and Visual Simulationmentioning

confidence: 99%

See 1 more Smart Citation

A Fast and Efficient Measurement System for Nuclear Spin Relaxation Times in Atomic Vapors

Huang

Miao

Wan

et al. 2019

Sensors

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With the rapid progress of cutting-edge research such as quantum measurement technology, nuclear magnetic resonance (NMR) gyroscopes represent a major development direction of high-precision micro-miniature gyroscopes, which have significant advantages such as high precision, small size, and low power consumption. It is meaningful to measure the relaxation times of noble-gas atoms which are crucial indicators to accurately and quickly characterize the vapor cell performance as a core component of gyroscopes. In this paper, a test platform for relaxation time is built and an automatic relaxation time test system based on free induction decay (FID) and the π pulse method is designed to accelerate the relaxation time test. Firstly, the formula of the atomic dynamic process based on the Bloch equation was deduced, a GUI (Graphical User Interface) simulation based on the derived differential equation was conducted, and the moving process of the magnetic moment was visually described. Then, the virtual instrument was used to integrate multiple test instruments into an auto-test system, and LabVIEW programming was used for control to realize the automation of the test process on the test platform. Finally, the test results in different conditions were compared. The results show that the test system is stable and reliable with excellent man–machine interaction, and the measurement efficiency was increased by about 185%, providing an effective test scheme for vapor cell performance.

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Section: Vapor Cell Testing Theory and Visual Simulationmentioning

confidence: 99%

Section: Vapor Cell Testing Theory and Visual Simulationmentioning

confidence: 99%

A Fast and Efficient Measurement System for Nuclear Spin Relaxation Times in Atomic Vapors

Huang

Miao

Wan

et al. 2019

Sensors

View full text Add to dashboard Cite

show abstract

“…In recent years, there are already several methods developed. One method exploits the FID signal of alkali atoms or the hyperpolarized noble atoms to derive the Larmor precession frequency, and then measures the coil constants based on the Larmor precession frequency [13], [14]. Another method calibrates the coils by measuring the magnetic resonance frequency of the Cs atoms using Mx magnetometer [15].…”

Section: Introductionmentioning

confidence: 99%

In Situ Calibration of Magnetic Coil System Using Ellipticity-Induced Bell-Bloom Magnetometer

2019

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The three-axis coil system is most commonly used in magnetic field measurement. The coil constant is an important parameter. We demonstrate a method to measure the coil constant based on the Larmor frequency. An elliptically polarized light is used to simultaneously excite the spin orientation and spin alignment via synchronous optical pumping. And then the coil system can be calibrated by measuring the magnetic resonance frequency of Bell-Bloom magnetometer. The advantage of this method is that the coil constants of all three directions can be obtained without any active adjustments. It is important for some applications, such as measuring the biological magnetic field with the integrated magnetometer. The method for calibration of a three-axis coil system is experimentally exploited. The experimental results show that the calibration accuracy of pT level can be achieved.

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“…An in-situ method developed by Zhang et al can measure the magnetic coil constants based on the Larmor precession frequency of the hyperpolarized 3 He [16]. Chen et al proposed another calibration method by measuring the initial amplitude of free induction decay (FID) of 129 Xe and calculating the π / 2 pulse duration [17]. Both of these methods require to operate with noble gas atoms due to their long polarization lifetime and are suitable for spin-precession gyroscopes and co-magnetometers, while they are not suitable for atomic magnetometers using alkali metal atoms as sensing unit.…”

Section: Introductionmentioning

confidence: 99%

A Coil Constant Calibration Method Based on the Phase-Frequency Response of Alkali Atomic Magnetometer

Yao

Zhao

et al. 2019

Photonic Sens

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We propose an in-situ method to calibrate the coil constants of the optical atomic magnetometer. This method is based on measuring the Larmor precession of spin polarized alkali metal atoms and has been demonstrated on a K-Rb hybrid atomic magnetometer. Oscillation fields of different frequencies are swept on the transverse coil. By extracting the resonance frequency through phase-frequency analysis of electron spin projection, the coil constants are calibrated to be 323.1 ± 0.28 nT/mA, 108 ± 0.04 nT/Ma, and 185.8 ± 1.03 nT/mA along the X, Y, and Z directions, respectively.

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A method for calibrating coil constants by using the free induction decay of noble gases

Cited by 27 publications

References 22 publications

A Fast and Efficient Measurement System for Nuclear Spin Relaxation Times in Atomic Vapors

A Fast and Efficient Measurement System for Nuclear Spin Relaxation Times in Atomic Vapors

In Situ Calibration of Magnetic Coil System Using Ellipticity-Induced Bell-Bloom Magnetometer

A Coil Constant Calibration Method Based on the Phase-Frequency Response of Alkali Atomic Magnetometer

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