An innovative design method is proposed for highly uniform magnetic field coils using a particle swarm optimization (PSO) algorithm. We use an approach instead of the conventional solving closed-form equations to obtain coil geometric parameters. apply PSO algorithm structure and set appropriate penalty function boundary conditions. A discrete employed avoid obtaining parameters with large number decimal places. Compared method, our solves problem how produce under various structural process...

In this study, we investigated the influence of pump beam on electronic and nuclear spin polarization homogeneity in magnetic resonance gyroscope (NMRG). An analysis method was proposed based three dimensional simulation spatial distribution. The power loss due to aperture structure considered. average inertia measurement sensitivity were measured experimentally demonstrate results. results indicate that retains good at different diameters, while highly depends diameter. It also can be seen...

In this paper, three dimensional spherical magnetic field coils are proposed and optimized for atomic sensors that require highly uniform within a limited volume. The design objective of the coil is transformed into nonlinear optimization model with constraints, which solved by combining particle swarm algorithm. Compared traditional cylindrical tri-axial system whose volume aspect ratio structure, not only effectively reduce but also provide consistent performance in coordinate axis...

An improved target field method is proposed for the cylindrical coil design to meet constraint of limited volume. It realizes uniform magnetic by predetermining configuration and optimizing coordinate positions points. Compared with conventional methods, this current density distribution divided into two symmetric subregions solve problem reserving a gap in center setting light-passing holes. Therefore, more applicable miniature atomic devices optical paths. Moreover, overall performance can...

This paper presents the design of a uniform field coil based on target-field method that offers an innovation in miniature atomic sensors. A selected cubical target region is located inside cylinder with surface comprised windings. First, current density was defined unknown coefficients, and then straightforward approach used to obtain these coefficients via solving matrix constructed by selecting points region. Subsequently, using stream-function, winding patterns coils are generated....

A novel uniform magnetic field coil structure with two pairs of saddle coils nested is proposed in order to minish the aspect ratio without losing much uniformity, which significant innovative miniature atomic instruments and sensors. Optimal configuration parameters are obtained from Taylor expansion field. The remainder terms used estimate uniformity optimize while minishing computation time. Compared traditional coils, have unique advantages applications where ratios strictly limited....

This article presents a modified pigeon-inspired optimization method for designing self-shielded uniform magnetic field coils that offers an innovation in miniature atomic sensors. The proposed coil system consists of circular pairs distributed on two coaxial cylinder surfaces, which can provide highly at the center and rapidly attenuate external field. design is transformed into nonlinear objective problem with constraints, so geometric parameters be obtained by algorithm, instead solving...

We propose an average Rb polarization model to analyze the influence of temperature on spin and 129Xe in a Nuclear Magnetic Resonance Gyroscope (NMRG) with low pump power. This is essentially based summing along direction beam dividing result by cell length. experimentally study atoms as function at values The experimental results calculated are good agreement for both 129Xe. decreases increasing temperature, decreasing trend which rapid temperatures below 110 °C, slower above °C....

We propose a precise method to calibrate the coil constants of spin-precession gyroscopes and optical atomic magnetometers. This is based on measuring initial amplitude Free Induction Decay (FID) noble gases, from which π/2 pulse duration can be calculated, since it inversely proportional pulse. Therefore, calibrated by duration. Compared with Larmor precession frequency atoms, our avoid effect pump probe powers. experimentally validated in Nuclear Magnetic Resonance Gyroscope (NMRG),...

In this paper, an optimization method that uses the derivatives and target field information of magnetic simultaneously is proposed to suppress coupling between coil shielding in miniature atomic sensors. The varies with material permeability, which causes fluctuate temperature as permeability. fluctuations will cause measurement errors drifts can effectively magnetization caused by field. A shielded outside main used efficiently attenuate shielding. system consisting pairs circular coils...

Heating the vapor cell without introducing magnetic field is a requirement for magnetically sensitive atomic instruments. But, inevitable in electrical heating mode. Therefore, how to realize optimal design of electric film becomes an important issue practice. To solve this problem, quantitative analysis cancellation conducted, and quadra-layered multipole moment proposed with optimized conduction pattern. First, considering that wire number current directions may influence field, different...

An improved approach for designing highly linear gradient coils based on the target-field method is presented application in a magnetoencephalography system. With this method, two novel current density functions are expanded trigonometric series with single-Fourier coefficients that need to be determined. Their determination resolved by selecting field points and desired values target area of interest. The coil winding patterns then given level contours stream function. Compared...

We propose a method for the precise determination of nuclear spin polarization, based on atomic magnetometers, which employs effective magnetic field produced by polarization 129Xe nuclei. This can be estimated measuring initial induced voltage Free Induction Decay (FID) signal nuclei, is calibration coefficient between transverse and output magnetometer, using an off-resonant driven field. Compared with longitudinal relaxation time nuclei alkali-metal atoms, our directly measure without...

The alkali metal atoms in spin-exchange-relaxation-free (SERF) atomic magnetometers require high temperature and non-magnetic environment. Increasing the of causes higher density, which can enhance intensity output signal. However, heating current introduces additional magnetic flux density unexpected gradient, will reduce device's sensitivity. Therefore, it is necessary to develop a chip for SERF magnetometer. In this paper, new design chips, fabricated by microelectromechanical system...

In this article, we found an appropriate operating frequency of pump light for stabilizing the based on atomic absorption vapor cell in minimized magnetometer. The traditional way to apply method is stabilize laser at peak because its derivative always zero and not affected by temperature if pressure shift suppressed. However, it observed experimentally that response amplitude has a drop up 40% from maximum peak. It due hyperfine optical pumping, explored applicable condition obtain solving...

In a nuclear spin co-magnetometer, it was found that the probe light parameters have significant impact on transverse residual magnetic field compensation. this paper, we demonstrated effect is caused by tensor shifts of linearly polarized light. This can be suppressed at certain polarization. We obtained polarization experimentally and reduced power compensation 35 times. The frequency also suppressed. Furthermore, influence pump power, static field, cell temperature optimized investigated....

The laser intensity stability counts for the performance of Nuclear Magnetic Resonance Gyroscope (NMRG). We switch to attenuate fluctuation with aid an opto-electric modulator and feedback control. Liquid Crystal Variable Retarder (LCVR) has a sharp edge over its counterparts such as AOM EOM benefiting from compact size, low operation voltage large clear aperture. In this paper, we demonstrate LCVR based stabilization system designed NMRG prototype. setup mainly compromises two crossed...

The performance of Capon beamformer degrades sharply in the presence array steering vector mismatch. To solve this problem, a robust beamforming algorithm based on semi-definite programming and rank-one decomposition is proposed, which improves robustness adaptive by estimating an actual vector. constraints for are deduced under requirement that estimate does not weaken ability to suppress interference noise, analysis shows approach formulating constraint using matrix pre-filter reasonable....

In this Letter, the liquid crystal variable phase retarder is applied for accurate modulation of laser power in a detection system and construction that suppresses influence noise on gyro’s bias instability. A closed-loop control method suppression proposed. We obtain stability index 0.038% 3-h continuous test, nuclear magnetic resonance gyroscope instability reaches 1°/h. The proposed effectively improves signal-to-noise ratio signal, which lays technical foundation future research work.

Adaptive beamforming methods will be degraded sharply in the presence of steering vector errors. The design robust adaptive become more flexible when convex optimization technique is used. However, this leads to high computational-complexity and difficulties for engineering applications. To solve these problems, a based on least square estimation proposed, laconic solution method using one-dimensional search derived. standard Capon beamformer (SCB) converted least-square problem principle...

For the magnetically sensitive atomic sensors, heating vapor cell without introducing magnetic field is required. In order to evaluate film suppression effect, independent magnetometer usually employed. However, in this method accuracy of measurement result greatly affected by distance between and tested film, as inversely proportional distance. overcome issue, an in-situ proposed. The principle based on Larmor precession spin polarized noble gases. assembled into sensor can be measured...

Conflicting theoretical scenarios for infinite-layer nickelate superconductors have been hotly debated, particularly regarding whether {only} a single Ni-3$d_{x^2-y^2}$ band is relevant at low energies besides electron pockets or multi-orbital physics including Ni-3$d_{z^2}$ instead essential. The first scenario has emerged from density-functional theory plus dynamical mean-field (DFT+DMFT) calculations. Comparing the previous DFT+DMFT spectra to recent angular-resolved photoemission...

Nuclear magnetic resonance gyroscope (NMRG) is the smallest atomic sensor in navigation level. Spin precession can be detected by measuring optical rotation of plane an off-resonant linearly polarized probe beam. The optimal frequency and power beam counts for performance NMRG, which has been verified our former experiments. NMRG system would have higher sensitivity lower consumption comparing to circularly In this paper, we demonstrate theoretical analysis experimental verification. theory,...

In the calibration of coil constants using Free Induction Decay (FID) signal noble gases, we analyse effects pulse-driven magnetic field detuning on results. This method is based inverse relation between π/2 pulse duration and its amplitude. We confirmed that obtaining a precise frequency prerequisite for ensuring accuracy research initial amplitude FID signal. this paper, spin dynamics gases time-domain solution under driving have been discussed with regard to different ranges. Experimental...

Axis orientation stability has a great effect on the long-term drift performance of nuclear spin comagnetometers that utilize alkali atoms to detect magnetic moment ensembles. Previous studies have analyzed sensitivity influence misalignment angle and demonstrated post-processing calibration method in transverse polarized comagnetometer, but there is no study traditional longitudinally setup. We propose an innovative biaxial differential detection monitor comagnetometer then eliminate it...