A5001132879- Atomic and Subatomic Physics Research
- Advanced MRI Techniques and Applications
- Quantum optics and atomic interactions
- Magnetic Field Sensors Techniques
- Functional Brain Connectivity Studies
- Non-Invasive Vital Sign Monitoring
- Inertial Sensor and Navigation
- Analytical Chemistry and Sensors
- Sensor Technology and Measurement Systems
- Mechanical and Optical Resonators
- Robotic Mechanisms and Dynamics
- Perovskite Materials and Applications
- Modular Robots and Swarm Intelligence
- Adrenal and Paraganglionic Tumors
- Advanced MEMS and NEMS Technologies
- Chalcogenide Semiconductor Thin Films
- Optical Systems and Laser Technology
- Soft Robotics and Applications
- Geomagnetism and Paleomagnetism Studies
- CCD and CMOS Imaging Sensors
- Geophysics and Sensor Technology
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Magnetic Properties and Applications
- Micro and Nano Robotics
Beihang University
2022-2025
Aiming at the issue of substantial nonlinear error arising from triaxial DC magnetic field interferences in wearable and mobile measurement scenarios, a fields response model single-beam atomic SERF magnetometer under non-zero condition is established, revealing that effect on detected AC responses exhibits feature, while their impact manifests as interval-linear characteristic. Consequently, closed-loop control system for mixed proposed. By leveraging within feedback signal, localized...
In this study, we demonstrate a three-axis synchronous sweeping field (TSSF) method for in-situ magnetic compensation under non-orthogonal conditions optically pumped magnetometers (OPMs). The OPM operated in the spin-exchange relaxation-free (SERF) regime is gaining popularity as promising substitute superconducting quantum interference device (SQUID) biomagnetism measurements. Nevertheless, non-orthogonality inherent will give rise to residual inaccuracies along pumping axis while...
Magnetoencephalography (MEG) systems based on optically pumped magnetometers (OPMs) have rapidly developed in the fields of brain function, health, and disease. Functional connectivity analysis related to resting-state has gained popularity as a field research recent years. Several studies attempted use OPM-based MEG (OPM-MEG) for network estimation research; however, choice source pipeline may lead outcome variability. methods parameters must be selected carefully at each step analysis....
Abstract We demonstrate a method for quickly and automatically detecting all three components of remanent magnetic field around shielded spin-exchange relaxation-free (SERF) atomic magnetometer (AM) using the trisection algorithm (TSA) zero-field resonance (ZFR). To satisfy measurement AMs, light 87 Rb D1 line with spectral width less than 1MHz is converted to circular polarization by linear polarizer quarter-wave plate. After beam has passed through alkali metal vapor cell, residual can be...
Highly sensitive atomic magnetometers (AMs) have been wildly used to form magnetocardiography (MCG) or magnetoencephalography (MEG) devices recently. However, signal detection noise, including light noise due pump fluctuations and electrical introduced by the circuit, will inevitably affect sensitivity of AM. Therefore, this article proposes a novel method suppress improve We first propose low-noise preamplifier circuit part. Then, based on equivalent magnetic amplitude, optimize intensity...
Abstract The currently employed algorithms for the magnetic field compensation of single-beam spin-exchange relaxation-free atomic magnetometers are excessively slow and unstable, which limits use commercialization magnetometer arrays biological measurement. This study proposes an improved trisection algorithm (ITSA) to compensate around vapor cell in attempt resolve these limitations. Through constant monitoring intensity light emitted from a laser, proposed reduces time required fields...
Optically pumped magnetometer (OPM) has gained popularity as a viable alternative to the superconducting quantum interference device (SQUID) for biomagnetic measurements. However, presence of amplitude and phase errors in OPM can degrade signal quality of, e.g., magnetoencephalography (MEG) signals. This study presents dual-PI closed-loop control (DPCC) method aimed at suppressing when operated spin-exchange relaxation-free (SERF) regime, thereby enhancing MEG localization accuracy. The main...
A novel tailless X-type flapping-wing micro air vehicle with two pairs of independent drive wings is designed and fabricated in this paper. Due to the complexity unsteady flapping wing mechanism, geometric kinematic parameters significantly influence aerodynamic characteristics bio-inspired flying robot. The are vector-controlled independently on both sides, enhancing maneuverability robustness system. Unique flight control strategy enables aircraft have multiple modes such as fast forward...
We propose a miniaturized single-beam optically pumped magnetometer (OPM) with laser power differential structure, along dynamically-adjusted detection circuit. This design enables the suppression of optical fluctuation noise and enhancement sensitivity. For OPM, pump light is significant contributor to output noise. To address this, we an OPM structure that separates as part reference signal before it enters cell. The current are then subtracted suppress introduced by fluctuations. achieve...
The sensitivity and bandwidth (BW) as the primary criteria of spin-exchange relaxation-free (SERF) atomic magnetometer (AM) are closely related to transverse relaxation rate ensemble. In this study, we show an effective method for measurement drawing on golden Section algorithm. With no requirement offline fitting, measuring time is only 7 s. This especially advantageous reducing errors due drifts spatial magnetic field light intensity using multiple measurements better monitor performance...