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Kanegsberg, Barbara; Kanegsberg, Ed

doi:10.1016/s0026-0576(13)70238-1

Cited by 3 publications

(3 citation statements)

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“…In all of these applications, the long-term stability of the comagnetometer is essential and often limited by noise and systematic effects associated with the external magnetic fields and magnetization due to spin dipolar interactions [14,15]. In general, comagnetometers with two or more nuclear species calculate an appropriate combination of nuclear precession frequencies to cancel out magnetic field dependence [16][17][18]. Based on dual nuclear isotopes differential technique, a three-axis residual magnetic fields closed-loop control system has been incorporated in NMR gyros to guarantee the long-term stability of magnetic fields [19][20][21].…”

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confidence: 99%

Closed-Loop Control of Compensation Point in the K−Rb−21Ne Comagnetometer

et al. 2019

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We investigate the real-time closed-loop control of compensation point in the K-Rb-21 Ne comagnetometer operated in the spin-exchange relaxation-free regime. By locking the electron resonance, the alkali metal electrons are free from the fluctuations of the longitudinal ambient magnetic field and nuclear magnetization, which could improve the systematic stability, enlarge the linear measuring range, and suppress the cross-talk error of the comagnetometer. This is the first demonstration of closed-loop control of magnetic field in the single nuclear species comagnetometer, which will be of great significance for rotation sensing as gyroscopes and other high precision metrology applications of the comagnetometer.

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confidence: 99%

Closed-Loop Control of Compensation Point in the K−Rb−21Ne Comagnetometer

et al. 2019

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“…Upon cooling, no crystallization events are observed down to the glass transition, which occurs around −7 °C. Upon further cooling, a small but sharp exothermic peak is visible at T crack = −38.8 °C, corresponding to the temperature at which the sample cracks into small fragments. ,− Above T g , undercooled molecular liquids can easily relax the mechanical stress arising from the difference between their own volumetric thermal expansion coefficient (α V ), on the order of 10 –3 K –1 , and that of the Al substrate, 6.9 × 10 –5 K –1 . , Below T g , the situation is radically different. On the one hand, molecular glasses exhibit lower values of α V , which could be reduced to 30–80% of liquid α V , whereas that of the Al substrate remains approximately unchanged.…”

Section: Resultsmentioning

confidence: 99%

Memory Effect and Crystallization of (R, S)-2-Chloromandelic Acid Glass

Liu

Song

et al. 2021

J. Phys. Chem. B

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Chloromandelic acid, which can crystallize in racemic crystals (forms α and β) or a conglomerate (form γ), has been studied for its glass-forming behavior. Below the glass transition temperature, samples of the title compound crack into pieces. Correlation plots of DSC results have been used to investigate what determines the cracking and its occurrence temperature. We found that the latter is influenced by the polymorph from which the melt state has been obtained, showing that a certain memory of the previous crystalline phase persists in the undercooled melt. Moreover, this residual structure could be eliminated by elongating the annealing period or increasing the annealing temperature. Investigation using broadband dielectric spectroscopy confirmed such a memory effect. Finally, we studied the role of cracking in the control of the crystallization. In contrast with previous literature on other glass-forming molecular systems, we verified that the crystallization upon reheating is not impacted by the occurrence of cracks in the glassy state. This observation challenges the current views on polymorphic crystallization from organic glasses.

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“…[7] and used to detect 3 He nuclear polarization. [8] Later, by applying a static magnetic field and optical pumping light along the same direction of the carrier field, this magnetometer technique was developed and used in spin-exchange [9,10] NMR oscillators or gyroscopes, [11,12] as a vector magnetometer that is maximally sensitive to the low-frequency and very weak magnetic fields B T in the x-y plane caused by the processing nuclear magnetization vector in the alkali vapor cell, and insensitive to B z along the rotation axis of the gyroscopes. [13] Following the derivations in Ref.…”

Section: Introductionmentioning

confidence: 99%

A modified analytical model of the alkali-metal atomic magnetometer employing longitudinal carrier field*

et al. 2021

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Alkali-metal atomic magnetometers employing longitudinal carrier magnetic field have ultrahigh sensitivity to measure transverse magnetic fields and have been applied in a variety of precise-measurement science and technologies. In practice, the magnetometer response is not rigorously proportional to the measured transverse magnetic fields and the existing fundamental analytical model of this magnetometer is effective only when the amplitudes of the measured fields are very small. In this paper, we present a modified analytical model to characterize the practical performance of the magnetometer more definitely. We find out how the longitudinal magnetization of the alkali metal atoms vary with larger transverse fields. The linear-response capacity of the magnetometer is determined by these factors: the amplitude and frequency of the longitudinal carrier field, longitudinal and transverse spin relaxation time of the alkali spins and rotation frequency of the transverse fields. We give a detailed and rigorous theoretical derivation by using the perturbation-iteration method and simulation experiments are conducted to verify the validity and correctness of the proposed modified model. This model can be helpful for measuring larger fields more accurately and configuring a desirable magnetometer with proper linear range.

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Clean “As-Received?”

Cited by 3 publications

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Closed-Loop Control of Compensation Point in the K−Rb−21Ne Comagnetometer

Closed-Loop Control of Compensation Point in the K−Rb−21Ne Comagnetometer

Memory Effect and Crystallization of (R, S)-2-Chloromandelic Acid Glass

A modified analytical model of the alkali-metal atomic magnetometer employing longitudinal carrier field*

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