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| 1 | Magnetometer-only linear attitude estimation for bias momentum pico-satellite显示文摘Satellite attitude information is essential for pico-satellite applications requiring light-weight,low-power,and fast-computation characteristics.The objective of this study is to provide a magnetometer-only attitude estimation method for a low-altitude Earth orbit,bias momentum pico-satellite.Based on two assumptions,the spacecraft spherical symmetry and damping of body rates,a linear kinematics model of a bias momentum satellite's pitch axis is derived,and the linear estimation algorithm is developed.The algorithm combines the linear Kalman filter(KF) with the classic three-axis attitude determination method(TRIAD).KF is used to estimate satellite's pitch axis orientation,while TRIAD is used to obtain information concerning the satellite's three-axis attitude.Simulation tests confirmed that the algorithm is suited to the time-varying model errors resulting from both assumptions.The estimate result keeps tracking satellite attitude motion during all damping,stable,and free rotating control stages.Compared with nonlinear algorithms,such as extended Kalman filer(EKF) and square root unscented Kalman filer(SRUKF),the algorithm presented here has an almost equal performance in terms of convergence time and estimation accuracy,while the consumption of computing resources is much lower. | Ke HAN Hao WANG Zhong-he JIN | 2010 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2010，11，6： | 5 |
| 2 | Miniature quad-channel spin-exchange relaxation-free magnetometer for magnetoencephalography显示文摘A miniature quad-channel optically pumped atomic magnetometer(OPM) has been developed based on the spinexchange relaxation-free(SERF) mechanism. With a vapor cell of size 8 mm×8 mm×8 mm, we have incorporated four SERF magnetometer channels, which provides sufficient spatial resolution for magnetoencephalography(MEG). The four channels share the same laser beam for the best cancellation of common mode noise due to laser fluctuations. With gradient measurement, the sensitivities of the four sensors are better than 6 fT/Hz^(1/2), which is also good enough for MEG measurement. The vapor cell is heated to 160℃ by a novel nonmagnetic current-heating structure. Our sensor with high spatial resolution and compact size is particularly suitable for MEG systems. | 李建军 杜鹏程 伏吉庆 王旭桐 周庆 王如泉 | 2019 | Chinese Physics B2019，28，4： | 5 |
| 3 | Current sensor based on an atomic magnetometer for DC application显示文摘A DC current sensor based on an optically pumped atomic magnetometer is proposed.It has a high linearity in a wide operation range,since the magnetometer measures the absolute magnitude of the magnetic field produced by the current to be measured.The current sensor exhibits a high accuracy with a non-moment solenoid and magnetic shielding to suppress the influence from the environment.The absolute error of the measured current is below 0.08 m A when the range is from 7.5 m A to 750 m A.The relative error is 5.54×10^-5 at 750 m A. | 李国祝 辛青 耿旭兴 梁植 梁尚清 黄光明 李高翔 杨国卿 | 2020 | Chinese Optics Letters2020，18，3： | 5 |
| 4 | Ultrabroadband and sensitive cavity optomechanical magnetometry显示文摘Magnetostrictive optomechanical cavities provide a new optical readout approach to room-temperature magnetometry.Here we report ultrasensitive and ultrahigh bandwidth cavity optomechanical magnetometers constructed by embedding a grain of the magnetostrictive material Terfenol-D within a high quality(Q)optical microcavity on a silicon chip.By engineering their physical structure,we achieve a peak sensitivity of26 p T∕Hz1/2 p comparable to the best cryogenic microscale magnetometers,along with a 3 d B bandwidth as high as 11.3 MHz.Two classes of magnetic response are observed,which we postulate arise from the crystallinity of the Terfenol-D.This allows single crystalline and polycrystalline grains to be distinguished at the level of a single particle.Our results may enable applications such as lab-on-chip nuclear magnetic spectroscopy and magnetic navigation. | Bei-Bei Li George Brawley Hamish Greenall Stefan Forstner Eoin Sheridan Halina Rubinsztein-Dunlop Warwick P.Bowen | 2020 | Photonics Research2020，8，7： | 4 |
| 5 | Characteristics of the coseismic geomagnetic disturbances recorded during the 2008 M_w 7.9 Wenchuan Earthquake and two unexplained problems显示文摘Twenty-seven FHDZ-M15 combined geomagnetic observation systems(each of which is equipped with a fluxgate magnetometer and a proton magnetometer)had been installed in the China geomagnetic network before the 2008 Wenchuan earthquake,during which coseismic disturbances were recorded by 26 fluxgate magnetometer observatories.The geomagnetic disturbances have similar spatial and temporal patterns to seismic waves,except for various delays.Six proton magnetometer observatories recorded coseismic disturbances with very small amplitudes.In addition,fluxgate magnetometers registered largeamplitude disturbances that are likely to have included responses to seismic waves.However,two problems remain unresolved.First,why do these geomagnetic disturbances always arrive later than P waves?Second,why do the geomagnetic disturbances have spatial and temporal directivity similar to the main rupture direction of the earthquake?Solving these two problems may be crucial to find the mechanism responsible for generating these geomagnetic anomalies. | YaLi Wang Tao Xie YanRu An Chong Yue JiuYang Wang Chen Yu Li Yao Jun Lu | 2019 | Earth and Planetary Physics2019，3，5： | 4 |
| 6 | A CLIMATOSTRATIGRAPHIC SUBDIVISION OF LATE PLEISTOCENE STRATA NAMED BY MALAN FORMATION IN NORTH CHINA显示文摘Since Teilhard de Chardin and C. C. Young identified the Late Pleisocene loess which is distributed widely in Malan Formation of North China, it has become one of the marker beds of the Late Pleistocene. | 安芷生 卢演俦 | 1984 | Chinese Science Bulletin1984，29，9： | 4 |
| 7 | Optical Rotation Detection for Atomic Spin Precession Using a Superluminescent Diode显示文摘A superluminescent diode (SLD) as an alternative of laser is used to detect optical rotation for atomic spin precession. A more uniform Gauss configuration without additional beam shaping and a relatively high power of the SLD have a potential for atomic magnetometers, which is demonstrated in theory and experiments. In addition, the robustness and compactness enable a more practical way for optical rotation detections, especially for applications in magnetoencephalography systems. | Xuejing LIU Yang LI Hongwei CAI Ming DING Jiancheng FANG Wei JIN | 2019 | Photonic Sensors2019，9，2： | 3 |
| 8 | Mars Orbiter magnetometer of China’s First Mars Mission Tianwen-1显示文摘As one of the seven scientific payloads on board the Tianwen-1 orbiter,the Mars Orbiter Magnetometer(MOMAG)will measure the magnetic fields of and surrounding Mars to study its space environment and the interaction with the solar wind.The instrument consists of two identical triaxial fluxgate magnetometer sensors,mounted on a 3.19 meter-long boom with a seperation of about 90 cm.The dual-magnetometers configuration will help eliminate the magnetic field interference generated by the spacecraft platform and payloads.The sensors are controlled by an electric box mounted inside the orbiter.Each magnetometer measures the ambient vector magnetic field over a wide dynamic range(to 10,000 nT per axis)with a resolution of 1.19 pT.Both magnetometers sample the ambient magnetic field at an intrinsic frequency of 128 Hz,but will operate in a model with alternating frequency between 1 and 32 Hz to meet telemetry allocations. | Kai Liu XinJun Hao YiRen Li TieLong Zhang ZongHao Pan ManMing Chen XiaoWen Hu Xin Li ChengLong Shen YuMing Wang | 2020 | Earth and Planetary Physics2020，4，4： | 2 |
| 9 | Demonstration of an integrated nanophotonic chip-scale alkali vapor magnetometer using inverse design显示文摘Recently,there has been growing interest in the miniaturization and integration of atomic-based quantum technologies.In addition to the obvious advantages brought by such integration in facilitating mass production,reducing the footprint,and reducing the cost,the flexibility offered by on-chip integration enables the development of new concepts and capabilities.In particular,recent advanced techniques based on computer-assisted optimization algorithms enable the development of newly engineered photonic structures with unconventional functionalities.Taking this concept further,we hereby demonstrate the design,fabrication,and experimental characterization of an integrated nanophotonic-atomic chip magnetometer based on alkali vapor with a micrometer-scale spatial resolution and a magnetic sensitivity of 700 pT/VHz.The presented platform paves the way for future applications using integrated photonic-atomic chips,including high-spatial-resolution magnetometry,near-field vectorial imaging,magnetically induced switching,and optical isolation. | Yoel Sebbag Eliran Talker Alex Naiman Yefim Barash Uriel Levy | 2021 | Light(Science & Applications)2021，10，4： | 2 |
| 10 | Proximal sensor-enhanced soil mapping in complex soil-landscape areas of Brazil显示文摘Portable X-ray fluorescence(pXRF) spectrometry and magnetic susceptibility(MS) via magnetometer have been increasingly used with terrain variables for digital soil mapping. However, this methodology is still emerging in many countries with tropical soils. The objective of this study was to use proximal soil sensor data associated with terrain variables at varying spatial resolutions to predict soil classes using the Random Forest(RF) algorithm. The study was conducted on a 316-ha area featuring highly variable soil classes and complex soil-landscape relationships in Minas Gerais State, Brazil. The overall accuracy and Kappa index were evaluated using soils that were classified at 118 sites, with 90 being used for modeling and 28 for validation. Digital elevation models(DEMs) were created at 5-, 10-, 20-, and 30-m resolutions using contour lines from two sources. The resulting DEMs were processed to generate 12 terrain variables. Total Fe, Ti, and SiO_(2) contents were obtained using pXRF, with MS determined via a magnetometer. Soil class prediction was performed using the RF algorithm. The quality of the soil maps improved when using only the five most important covariates and combining proximal sensor data with terrain variables at different spatial resolutions. The finest spatial resolution did not always provide the most accurate maps. The high soil complexity in the area prevented highly accurate predictions. The most important variables influencing the soil mapping were MS, Fe, and Ti. Proximal sensor data associated with terrain information were successfully used to map Brazilian soils at variable spatial resolutions. | Sérgio H.G.SILVA David C.WEINDORF Wilson M.FARIA Leandro C.PINTO Michele D.MENEZES Luiz R.G.GUILHERME Nilton CURI | 2021 | Pedosphere2021，31，4： | 1 |
| 11 | THE CONSTRUCTION OF THE EAST ASIA MERIDINA CHAIN OF GEOMAGNETIC OBSERVATORIES显示文摘In Order to study the Global Characteristics of Solar-terrestrial System in the 22th Solar Cycle, our Institute has built up a few geomagnetic observatories recently years at Mohe, Beijing (Ming Toms), Sanya (Hainan Insland) in the torritorg of China. These stations together with some old stations close to 120° E meridian and form the East Asia Meridian Chain of Geomagnetic Observatories. In the meantime we were set up also a observatory of the Chinese Great Wall Station in Antarctica. According to theather character of different area we designed and built the house with different structural style.The magnetic recording house is the under ground in Mohe, the semi-under ground in Beijing, the ground in sanya of China.The recording and the absolute houses are all built on stilts in the Chinese Great Wall Station of Antarctica. All buildins are made of non magnetic materials, Such as limestone, sun-dried mud brick, wood, copper and Aluminum etc.Therefore there are not affects of the magnetic materiat | Liu Changfa, Wang Juyi, Zhang Weixi, Dou Shaopu, Zhang PingInstitute of Geophysics, Chinese Academy of Sciences | 1990 | 天文研究与技术1990，，4： | 1 |
| 12 | High-sensitivity and wide-bandwidth fiber-coupled diamond magnetometer with surface coating显示文摘Mapping magnetic fields from different materials and structures can provide a powerful means for broad applications of activity probe and feature analysis.Here,we present a high-sensitivity and wide-bandwidth fiber-based quantum magnetometer at the scale of a few hundred micrometers.We propose a fiber-coupled diamond magnetometer.Tracking a pulsed optically detected magnetic resonance spectrum allows a magnetic field sensitivity of 103 pT∕■and a bandwidth of 2.6 k Hz.Additionally,with an approach of coating the diamond surface with silver reflective film,both the fluorescence collection and excitation efficiency are significantly enhanced,and the sensitivity and bandwidth are expected to be further improved to 50 pT∕■and 4.1 k Hz,respectively.Finally,this fiber-based quantum magnetometer is applied as a probe to successfully map the magnetic field induced by the current-carrying copper-wire mesh.Such a stable and compact magnetometer can provide a powerful tool in many areas of physical,chemical,and biological researches. | SHAO-CHUN ZHANG HAO-BIN LIN YANG DONG BO DU XUE-DONG GAO CUI YU ZHI-HONG FENG XIANG-DONG CHEN GUANG-CAN GUO FANG-WEN SUN | 2022 | Photonics Research2022，10，9： | 1 |
| 13 | Analysis and elimination of tri-band beacon interference with the fluxgate sensors onboard CSES显示文摘High precision magnetometer(HPM)is a magnetic field detection payload onboard China Seismo-Electromagnetic Satellite(CSES),including two fluxgate magnetometers(FGM)and a coupled dark state magnetometer(CDSM).Observations show that FGM appears to be influenced when tri-band beacon(TBB)is powered on and emits electromagnetic waves.The interference phenomenon is further validated based on both in-orbit observation analysis and electromagnetic compatibility(EMC)tests on the ground.A joint correction algorithm based on the least square fitting and first-order difference method according to scalar magnetometer data is proposed to eliminate the interference.The algorithm significantly improves the consistency of HPM data.After correction,the average scalar deviation error could be reduced from 9.0 nT to around 0.7 nT. | TONG YuQi CHENG BingJun MIAO YuanQing ZHOU Bin ZHU XingHong YANG YanYan LIU Ji GOU XiaoChen ZHANG YiTeng WANG JinDong LI Lei MAGNES Werner LAMMEGGER Roland POLLINGER Andreas ZEREN Zhima SHEN XuHui | 2021 | Science China(Technological Sciences)2021，64，10： | 1 |
| 14 | Influence of pump intensity on atomic spin relaxation in a vapor cell显示文摘Atomic spin relaxation in a vapor cell, which can be characterized by the magnetic resonance linewidth(MRL),is an important parameter that eventually determines the sensitivity of an atomic magnetometer. In this paper, we have extensively studied how the pump intensity affects the spin relaxation. The experiment is performed with a cesium vapor cell, and the influence of the pump intensity on MRL is measured at room temperature at zero-field resonance. A simple model with five atomic levels of a Λ-like configuration is discussed theoretically, which can be used to represent the experimental process approximately, and the experimental results can be explained to some extent. Both the experimental and the theoretical results show a nonlinear broadening of the MRL when the pump intensity is increasing. The work helps to understand the mechanism of pump induced atomic spin relaxation in the atomic magnetometers. | 杨晨 左冠华 田壮壮 张玉驰 张天才 | 2019 | Chinese Physics B2019，28，11： | 1 |
| 15 | All-Optical Cesium Atomic Magnetometer with High Sensitivity显示文摘An all-optical cesium magnetometer with high sensitivity based on absorptive detection is reported.The experiment achieves a polarized rotational spectrum of the probe light which is induced by circular dichroism and a quarter wave plate together.The frequency response of the rotational spectrum is 1.8mrad/Hz at Larmor precession resonance.Analyzing the signal-to-noise ratio from the experimentally observed spectrum,we predict that the magnetic measurement sensitivity of 0.3pT/Hz^(1/2) would be obtained in the responsive range from 20nT to 2000nT. | 张军海 刘强 曾宪金 李九兴 孙伟民 | 2012 | Chinese Physics Letters2012，29，6： | 1 |
| 16 | Design,fabrication,characterization and reliability study of CMOS-MEMS Lorentz-force magnetometers显示文摘This article presents several design techniques to fabricate micro-electro-mechanical systems(MEMS)using standard complementary metal-oxide semiconductor(CMOS)processes.They were applied to fabricate high yield CMOS-MEMS shielded Lorentz-force magnetometers(LFM).The multilayered metals and oxides of the back-end-of-line(BEOL),normally used for electronic routing,comprise the structural part of the MEMS.The most important fabrication challenges,modeling approaches and design solutions are discussed.Equations that predict the Q factor,sensitivity,Brownian noise and resonant frequency as a function of temperature,gas pressure and design parameters are presented and validated in characterization tests.A number of the fabricated magnetometers were packaged into Quad Flat No-leads(QFN)packages.We show this process can achieve yields above 95%when the proper design techniques are adopted.Despite CMOS not being a process for MEMS manufacturing,estimated performance(sensitivity and noise level)is similar or superior to current commercial magnetometers and others built with MEMS processes.Additionally,typical offsets present in Lorentz-force magnetometers were prevented with a shielding electrode,whose efficiency is quantified.Finally,several reliability test results are presented,which demonstrate the robustness against high temperatures,magnetic fields and acceleration shocks. | J.J.Valle J.M.Sánchez-Chiva D.Fernández J.Madrenas | 2022 | Microsystems & Nanoengineering2022，8，5： | 1 |
| 17 | 100pT/cm single-point MEMS magnetic gradiometer from a commercial accelerometer显示文摘Magnetic sensing is present in our everyday interactions with consumer electronics and demonstrates the potential for the measurement of extremely weak biomagnetic fields,such as those of the heart and brain.In this work,we leverage the many benefits of microelectromechanical system(MEMS)devices to fabricate a small,low-power,and inexpensive sensor whose resolution is in the range of biomagnetic fields.At present,biomagnetic fields are measured only by expensive mechanisms such as optical pumping and superconducting quantum interference devices(SQUIDs),suggesting a large opportunity for MEMS technology in this work.The prototype fabrication is achieved by assembling micro-objects,including a permanent micromagnet,onto a postrelease commercial MEMS accelerometer using a pick-and-place technique.With this system,we demonstrate a room-temperature MEMS magnetic gradiometer.In air,the sensor’s response is linear,with a resolution of 1.1 nT cm^(−1),spans over 3 decades of dynamic range to 4.6µT cm^(−1),and is capable of off-resonance measurements at low frequencies.In a 1mTorr vacuum with 20 dB magnetic shielding,the sensor achieves a 100 pT cm^(−1) resolution at resonance.This resolution represents a 30-fold improvement compared with that of MEMS magnetometer technology and a 1000-fold improvement compared with that of MEMS gradiometer technology.The sensor is capable of a small spatial resolution with a magnetic sensing element of 0.25 mm along its sensitive axis,a>4-fold improvement compared with that of MEMS gradiometer technology.The calculated noise floor of this platform is 110 fTcm^(−1) Hz−1/2,and thus,these devices hold promise for both magnetocardiography(MCG)and magnetoencephalography(MEG)applications. | Josh Javor Alexander Stange Corey Pollock Nicholas Fuhr David J.Bishop | 2020 | Microsystems & Nanoengineering2020，6，1： | 1 |
| 18 | MAGNETIC ANISOTROPY OF BaFe_(12-x)Ru_xO_(19) SINGLE CRYSTALS显示文摘During the past two decades, a great deal of studies have been done in an attempt to improve the properties of the practically useful hard-magnetic material BaFe12O19 (BaM) by using the substitutional method. Unfortunately, no remarkable progress about the basic magnetic properties has been made yet. One of the important aspects of these studies is the use of transition ions with strong anisotropy to replace the Fe3+ in BaM. The anisotropy ions reported are, for example, the first transition-metal ions Co2+[1], Fe2+[2] and the third transition-metal ions Ir4+[3] et al. The experiments show that all these anisotropy ions made a negative contribution to uniaxial anisotropy K1 at room temperature, i.e. ΔK1<0. | 刘寄浙 鹿牧 金通政 王自钧 翟宏如 | 1981 | Chinese Science Bulletin1981，26，2： | 0 |
| 19 | Effects of Microaddition of Ce on the Induced Magnetic Anisotropy of Amorphous Fe_(78)Si_9B_(13)显示文摘Controlling the magnetic anisotropy ofmagnetic material is extremely important forany technological applications.Fe78Si9 B13amorphous alloy has been chosen for investi-gation.Although the alloy might be a goodsoft magnetic material,it might not be ideal ifthe quenching processing is carried out | Wu Yu Yu Jing He Yeqing University of Science and Technology,Beijing | 1990 | Rare Metals1990，10，1： | 0 |
| 20 | Superconducting Magnetic Flux Transformer at 77K显示文摘Superconducting Quantum InterferenceDevice(SQUID)magnetometer is a kind ofmagnetic flux sensor with high sensitivity,andtherefore can be used in geological prospectand biomagnetic field etc..But the SQUIDmagnetometer used before has to be used atthe temperature of 4.2K provided by liquidhelium and thus its application is limited. | Ren, Hongtao Xiao, Ling He, Qing Li, Jiazhang | 1990 | Rare Metals1990，10，1： | 0 |
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