Bandwidth Expansion Through Large-Amplitude Modulation and Proportional Feedback for Single-Beam Atomic Magnetometers

Wang, Kun; Lu, Jixi; Yan, Yeguang; Tang, Junjian; Ye, Mao; Yin, Kaifeng; Chai, Zhen; Zhou, Binquan; Ning, Xiaolin; Han, Bangcheng

doi:10.1109/jsen.2021.3136213

Cited by 6 publications

(3 citation statements)

References 41 publications

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“…With operating parameters same as above simulation conditions, the bandwidths of triaxial magnetic detection are 92 Hz, 92 Hz, and 100 Hz, as Figure 7 shows. According to our previous research [14,25,26], highfrequency and large amplitude modulated magnetic field would bring about high bandwidth of the zero-field OPM. Thus, we set transverse rotationally modulated magnetic field at 6 kHz, with 2000 nT pp amplitude, and longitudinal modulated magnetic field at 9 kHz, with the same 2000 nT pp amplitude.…”

Section: Closed-loop Operationmentioning

confidence: 98%

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Triaxial closed-loop measurement based on a single-beam zero-field optically pumped magnetometer

et al. 2022

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In this study, we propose an approach for the simultaneous measurement of triaxial magnetic fields using a single-beam zero-field optically pumped atomic magnetometer, in which a rotational high-frequency (ω1) and another high-frequency (ω2) modulated magnetic field magnetic fields are applied along the transverse directions and the longitudinal direction, respectively. Theoretical analysis, numerical simulation, and experiments are conducted to demonstrate this method. Experimental sensitivities of 18 fT/Hz1/2 along the two transverse directions and 140 fT/Hz1/2 along the longitudinal direction are simultaneously achieved. On this basis, we operate the magnetometer in closed-loop mode to expand the bandwidth and dynamic range, and to keep the triaxial magnetic field sensed by the magnetometer at zero. The triaxial bandwidths are increased from below 100 Hz to over 1.6 kHz. The triaxial dynamic ranges are all extended to ±150 nT. Plus, we verify the ±1,000 nT dynamic range of the triaxial magnetometer through increasing the triaxial coil constants. The synchronization of triaxial closed-loop measurement, simplicity of magnetometer structure, and closed-loop detection with high sensitivities make it applicable and attractive for biomagnetism imaging in challenging environments.

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Section: Closed-loop Operationmentioning

confidence: 98%

“…These problems mentioned above can be mitigated through closed-loop mode of the magnetometer. For current zero-field OPMs with pumpprobe, dual-pump/probe scheme, or single-beam configuration, researchers have proposed closed-loop operation methods, which have been verified by experiment [11,14,24,25,26,27].…”

Section: Introductionmentioning

confidence: 99%

Triaxial closed-loop measurement based on a single-beam zero-field optically pumped magnetometer

et al. 2022

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“…In a specific atomic magnetometer system, the modulation parameters must be optimized to obtain a better performance. As the modulation amplitude increases, the SERF mechanism of atomic spin gradually ceases to be effective and the relaxation rate increases with the quadratic function of the modulation amplitude [35]. This leads to a decrease in the spin polarization lifetime.…”

Section: The Influence Of Modulation Field On Linewidthmentioning

confidence: 99%

Accurate determination of alkali atom density based on zero-field magnetic resonance in a single-beam spin-exchange relaxation-free atomic magnetometer

Ma¹,

chen²,

Zhao³

et al. 2022

Meas. Sci. Technol.

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A single-beam spin-exchange relaxation-free (SERF) atomic magnetometer can extract vector magnetic field information by detecting the transmission intensity of a resonant circularly polarized pumping beam, which depends sensitively on the atomic density of the alkali metal. We present a novel scheme to determine atomic density based on zero-field magnetic resonance. The resonance linewidth under different transverse DC magnetic fields is fitted by means of a quadratic function. The atomic density can be extracted from the quadratic coefficients of the fitted function. The experimental results indicate that the deviation of measured density is less than two times compared with the theoretical values between 378 K and 403 K. Furthermore, the influence of modulation field on resonance linewidth is investigated experimentally and theoretically. A miniature single-beam SERF atomic magnetometer with a sensor head volume of only 16.2 cm3 and the measuring sensitivity of 40 fT/ Hz1/2 has been achieved. These results should be beneficial for guiding the development of a chip-scale atomic magnetometer with high sensitivity and spatial resolution for bio-magnetic field imaging applications.

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Research on the anti-interference ability of optically pumped magnetometer

Ding

Tang

et al. 2023

Measurement

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Bandwidth Expansion Through Large-Amplitude Modulation and Proportional Feedback for Single-Beam Atomic Magnetometers

Cited by 6 publications

References 41 publications

Triaxial closed-loop measurement based on a single-beam zero-field optically pumped magnetometer

Triaxial closed-loop measurement based on a single-beam zero-field optically pumped magnetometer

Accurate determination of alkali atom density based on zero-field magnetic resonance in a single-beam spin-exchange relaxation-free atomic magnetometer

Research on the anti-interference ability of optically pumped magnetometer

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