637results about "Three-component magnetometers" patented technology

The invention discloses a single-end open type high-performance magnetic shielding system and a design method thereof. The system is formed by combining a passive magnetic shielding subsystem and an active magnetic compensation subsystem. The passive magnetic shielding subsystem is formed by alternately nesting single-end open type high-permeability and high-conductivity metal barrels, and the structure is beneficial to synchronously improving the shielding capability for full-band magnetic interference; the active magnetic compensation subsystem is composed of a group of axial nonlinear gradient coils, two groups of radial nonlinear gradient coils with orthogonal magnetic fields and a magnetic compensation control circuit, and three groups of magnetic compensation coil windings are obtained based on specific nonlinear distributed magnetic interference reverse design in a single-end open type magnetic shielding barrel; different from conventional shimming and linear gradient coils, accurate compensation of magnetic interference in a working area in the barrel can be realized. According to the invention, the shielding capability of the single-end open type magnetic shielding system is improved, and a required near-zero magnetic environment is provided for extremely weak magnetic measurement.

In one embodiment, a method includes accessing magnetic data from a magnetic-measurement device. The magnetic data corresponds to one or more locations of the magnetic-measurement device. The method includes accessing geofencing data corresponding to an area; comparing the magnetic data with the geofencing data; based on the comparison, determining that the locations correspond to the area; and, based on the determination, authenticating the magnetic-measurement device for access to one or more resources.

The invention discloses a Hall chip, a magnetic field sensor and a magnetic field component detection method.The Hall chip comprises a first magnetism gathering part, a Hall element and four second magnetism gathering parts, the Hall element is located on the surface of one side of the first magnetism gathering part, and the Hall element comprises four magnetic induction parts; the four magnetic induction parts are arranged in a closely adjacent manner and are distributed in a cross shape; the four second magnetism gathering parts are arranged on the surface of the side, away from the first magnetism gathering parts, of the matched magnetic induction part, the orthographic projection of each first magnetism gathering part on the magnetic induction part and the orthographic projection of each second magnetism gathering part on the magnetic induction part have an overlapping area, and at least part of the overlapping area is located in the sensitive center area of the magnetic induction part. The Hall chip provided by the invention has the advantages of high integration level, high sensitivity and strong anti-interference capability.

The three-axis Hall magnetic sensing chip comprises a magnet gathering body, a first Hall element group and a second Hall element group, the first Hall element group and the second Hall element group are arranged in a plane at intervals, the magnet gathering body is arranged on Hall elements, and the orthographic projection of the magnet gathering body on a Hall plane has a first direction symmetry axis and a second direction symmetry axis which are orthogonal. The first Hall element group comprises two first Hall elements which are connected in a contrast difference mode, wherein the magnetic induction centers of the two first Hall elements are located on a first-direction symmetric axis and are symmetrically arranged relative to a second-direction symmetric axis. The second Hall element group comprises two second Hall elements which are located on the same side of the first direction symmetry axis and are symmetrically arranged relative to the second direction symmetry axis, and the magnetic induction centers of the two second Hall elements are perpendicular to the connecting line between the orthogonal intersection points of the first direction symmetry axis and the second direction symmetry axis; the magnetism gathering body is located on one side of the connecting line of the two magnetic induction centers. According to the invention, a high inter-axis signal rejection ratio is realized, and the Z-axis signal can be directly output.

The invention relates to a double-pump light semi-transparent and semi-reflective miniaturized triaxial SERF atom magnetometer device, which is characterized in that single pump light is guided into a probe by a polarization maintaining optical fiber; and then one beam of pump light is divided into two beams of circular polarization pump light with the same light intensity by using a half-wave plate, a polarization splitting prism, a right-angle reflector and a quarter-wave plate, and then the two beams of circular polarization pump light vertically pass through the same alkali metal gas chamber. After the pump light penetrating through the air chamber passes through the semi-transparent and semi-reflective flat beam splitter, one half of the pump light is detected by the photoelectric detector and used for extracting magnetic field information, and the other half of the pump light returns to the original path and passes through the alkali metal air chamber for the second time. According to the invention, high-sensitivity simultaneous measurement of a three-axis magnetic field of the miniaturized three-axis SERF atom magnetometer is realized, the atomic spin polarizability is enhanced, the uniformity of the atomic spin polarizability in the air chamber is improved, and the technical problem of spin polarizability uniformity in miniaturized application of the SERF atom magnetometer is solved; and the application of the array type triaxial SERF atom magnetometer in the fields of magnetocardiography, brain magnetism and the like is facilitated.

A calibration method of the magnetic field model and a controller for electromagnetic positioning are provided. In the method, a magnetic field is established through a magnetic field transmitter; measurement data is obtained through a magnetic field sensor, where the measurement data includes the amplitude of induced voltage at multiple measurement positions in the magnetic field; and the magnetic field model is corrected according to the error between the measurement data and simulated data correction, where the magnetic field model is used to generate simulation data corresponding to multiple measurement locations. The steps of modifying the magnetic field model include: establishing one or more objective functions through the nonlinear least squares method based on the error between the measured data and the simulated data; and determining the modified magnetic field model based on one or more solutions of the objective function. Therefore, positioning accuracy can be improved.

In one embodiment, a method includes accessing a first series of first magnetic values that represents a first magnetic recording that includes a first set of first magnetic measurements. Each of the first magnetic values represents one of the first magnetic measurements. The method includes accessing a second series of second magnetic values that represents a second magnetic recording that includes a second set of second magnetic measurements. Each of the second magnetic values represents one of the second magnetic measurements. The method includes approximately aligning the first and second series with each other; calculating a difference between the first and second series as aligned with each other; and determining a similarity between the first and second series based on the difference.

In one embodiment, a method includes generating navigation or localization information based on a combination of first data that are based on first measurements of a magnetic field by one or more magnetic sensors and second data that are based on second measurements by one or more other sensors. The method includes determining an anomalousness of a magnetic field and, based on the determined anomalousness of the magnetic field, at least temporarily adjusting a weight of the first measurements relative to the second measurements in the generation of the navigation or localization information.

The invention discloses a magnetic source positioning method based on a spin-exchange relaxation-free atom magnetometer, and aims to provide a high-precision brand-new solution for magnetic source positioning in a near-zero magnetic environment by performing physical modeling and least square estimation on space magnetic field distribution of a target magnetic source. The magnetometer is enabled to be simultaneously sensitive to a three-axis magnetic field, a light absorption detection method is utilized to ensure that complete three-axis magnetic field information is obtained, and the sensitivity of the three axes reaches fT / Hz1 / 2 (1fT = 10 <-15 > T) magnitude. In the positioning process, the target magnetic source is abstracted into a physical model of the magnetic dipole, and the space magnetic field information generated by the target magnetic source is obtained through the atom magnetometer, so that the long-term stability of the magnetic source positioning process and the high precision of the positioning result can be ensured in the zero magnetic environment; therefore, a high-precision magnetic positioning technical means with great potential is provided for various application scenes such as paleomagnetic sample testing and magnetic source positioning in medical research, and technical progress and application expansion in related fields are expected to be promoted.

A sensor assembly is described, the sensor assembly comprising: a measurement bed for receiving an item to be measured; a supporting member vertically displaced from the measurement bed, when in use; a magnetic-field sensor connected to the supporting member; a motor for driving movement between the magnetic-field sensor and the measurement bed; and a controller configured to actuate the motor to cause the magnetic-field sensor to move relative to the measurement bed to scan the magnetic-field sensor across a measurement area. A method of measuring a magnetic field generated by an item using the sensor assembly is also described. The method comprises: positioning the item on the measurement bed such that it is within the measurement area; and scanning the magnetic-field sensor over the measurement area to measure the magnetic field generated by the item. A battery is described. The battery comprises one or more magnetic-field sensors within and / or around a respective magnetic and / or electrochemical component of the battery.

An unidentified aerial phenomena field disturbance detector includes an accelerometer configured to measure a gravitational field surrounding the unidentified aerial phenomena field disturbance detector; a magnetometer configured to measure a magnetic field surrounding the unidentified aerial phenomena field disturbance detector; a microwave frequency detector configured to measure a specific band of microwave frequencies surrounding the unidentified aerial phenomena field disturbance detector; a controller; and an optical indicator configured to optically communicate information to a user of the unidentified aerial phenomena field disturbance detector. The controller determines a change in the gravitational field surrounding the unidentified aerial phenomena field disturbance detector when generates gravitational field values are outside a predetermined range of non-event field values. The controller controls the optical indicator to optically communicate the determined change in the gravitational field surrounding the unidentified aerial phenomena field disturbance detector.

According to the SERF magnetic field measuring device closed-loop magnetic compensation method based on double-beam detection, Y-axis direction detection light used for decoupling is added on the basis of X-axis direction detection light, decoupling of three-axis magnetic field signals can be achieved, independent measurement and closed-loop control real-time magnetic compensation of a three-axis magnetic field are achieved, support is provided for further improving compensation precision, and the method is suitable for large-scale popularization and application. Comprising the steps that Y-axis direction detection light penetrating through an alkali metal gas chamber in the Y-axis direction, X-axis direction detection light penetrating through the alkali metal gas chamber in the X-axis direction and pumping light penetrating through the alkali metal gas chamber in the Z-axis direction are arranged in the SERF magnetic field measuring device, the X-axis direction detection light is used for detecting the optical rotation angle, and the Y-axis direction detection light is used for three-axis magnetic field decoupling; the pumping light is used for polarizing atoms in the alkali metal gas chamber; adding a Y-axis calibration signal; controlling the Z-axis coil current to compensate the Z-axis magnetic field according to the Py; controlling the X-axis coil current to compensate the X-axis magnetic field according to the Py; and controlling the Y-axis coil current to compensate the Y-axis magnetic field according to the Px.

An optical sensor includes a wavelength filter configured to transmit light in a specific wavelength range and a magnetic element including a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer. The light passing through the wavelength filter is applied to the magnetic element and the light applied to the magnetic element is detected.

An atomic magnetometer, an atomic magnetometer measurement system, and a magnetic field measurement method. The atomic magnetometer comprises a laser (1), a probe (2), a magnetic field generation unit (3), and a magnetic field compensation unit (4); the probe (2) is connected to the laser (1) by means of a polarization-maintaining collimation optical fiber (5), and light emitted by the laser (1) is used as pump light; the probe (2) is used for performing beam splitting on the pump light and in a gas chamber, forming two beams of light that are perpendicular to each other and do not intersect with each other, so as to respectively detect the two beams of light to obtain a first detection signal and a second detection signal; the magnetic field generation unit (3) is used for generating a magnetic field signal at the gas chamber on the basis of modulation signals in three directions; the magnetic field compensation unit (4) is used for compensating, on the basis of the modulation signals in the three directions, the first detection signal and the second detection signal, magnetic fields to be measured in the three directions to zero, and performing measurement to obtain said magnetic fields. The atomic magnetometer, the atomic magnetometer measurement system, and the magnetic field measurement method can enlarge a bandwidth range for measurement.

The invention discloses an ultrahigh-sensitivity three-axis closed-loop spin exchange relaxation-free atom magnetometer, which expands the ultrahigh-sensitivity measurement capability of the atom magnetometer to three axes based on parameter modulation optimization and double detection light, fully inhibits transverse spin relaxation introduced by a modulation magnetic field, provides more high-quality information for weak magnetic measurement, and improves the measurement accuracy. Based on decoupled magnetic field information, a three-axis magnetic field sensitive to an atomic ensemble is locked to zero in real time, and closed-loop feedback quantity is used as magnetic field measurement information, so that the problems of nonlinear offset of a magnetometer calibration coefficient and cross-axis coupling crosstalk caused by magnetic field drift are fundamentally inhibited; the high anti-interference capability of the atom magnetometer in a complex magnetic field environment is enhanced, long-time stable measurement and magnetic field measurement precision of the atom magnetometer are guaranteed, sub-fT-level sensitivity and pT-level precision can be achieved on transverse double axes, and the atom magnetometer is suitable for the fields of extremely weak magnetic measurement testing, biomedical weak magnetic imaging and the like.

A computer system receives a plurality of signals corresponding to first time-series magnetic data generated from a plurality of unshielded magnetometers proximate to the human subject. The first time-series magnetic data corresponds to magnetic fields generated from the human subject. The plurality of signals includes contributions from a biomagnetic field from at least a portion of the subject's organ and a background magnetic field. The computer system synchronizes the first time-series magnetic data to a common clock to generate synchronized time-series magnetic data. The computer system applies one or more filters to the synchronized time-series magnetic data to obtain filtered data. The computer system applies one or more noise reduction techniques to the filtered data to generate updated time-series magnetic data.

The invention discloses a device and a method for measuring an extremely low magnetic field signal, and relates to the technical field of weak magnetic field measurement, and the device comprises a first vector sensor and a second vector sensor which are respectively arranged in the central areas of a first non-magnetic turntable and a second non-magnetic turntable, and the first non-magnetic turntable and the second non-magnetic turntable are respectively and vertically connected with a first support rod and a second support rod; the first supporting rod and the second supporting rod are vertically arranged and are linked through the first gear and the second gear, and the first supporting rod is further provided with a coding disc; when the driving motor drives the first supporting rod to rotate, the first vector sensor and the second vector sensor synchronously rotate and respectively output first and second magnetic field modulation signals; meanwhile, the coding disc synchronously rotates, so that the photoelectric detector outputs an electric pulse reference signal; the analysis module analyzes and processes the received first magnetic field modulation signal, the received second magnetic field modulation signal and the reference signal so as to determine a three-dimensional magnetic field component in the space. According to the invention, accurate measurement of the background magnetic field in the extremely weak magnetic environment is realized.

A sensor device includes at least one integrated magnetic sensor structure having: a semiconductor substrate; a magnetic flux concentrator IMC disposed on top of the semiconductor substrate, the IMC having a predefined shape with an elongated portion extending in a first direction parallel to the substrate; a horizontal Hall element situated under a centre of the IMC; a processing circuit connected to said horizontal Hall element, and configured to provide a signal or a value indicative of at least one magnetic field gradient or a signal or value derived therefrom.

A system for measuring magnetic fields from a subject's organ comprises a plurality of unshielded magnetometers in a three-dimensional arrangement and an electromagnetic source. The system is configured to simultaneously collect, via each magnetometer of the plurality of magnetometers, (i) a biomagnetic field from at least a portion of the subject's organ, (ii) an electromagnetic signal from the electromagnetic source, and (iii) a background magnetic field. The system is configured to synchronize a plurality of magnetic signals collected by the plurality of magnetometers according to the electromagnetic signal from the electromagnetic source. The system is configured to output a signal indicative of the collected biomagnetic field and the background magnetic field in accordance with the synchronizing. The system is configured to operate without magnetic shielding.

The invention discloses an analysis method of a cilia magnetic sensor, and relates to the technical field of sensors, and the analysis method comprises the following steps: carrying out a tensile experiment on cilia with different magnetic powder contents in a selected scene to obtain Young modulus of the cilia with different magnetic powder contents in the selected scene; obtaining the optimal magnetic powder content of the cilia in the selected scene based on the Young modulus of the cilia with different magnetic powder contents in the selected scene; the optimal cilium height, the optimal cilium diameter and the optimal cilium spacing of the cilium in the selected scene are obtained through finite element simulation analysis; performing a normal pressure sensing experiment on the cilia magnetic sensor in the selected scene, performing a sliding sensing experiment on the cilia magnetic sensor in the selected scene, and performing a non-contact sensing experiment on the cilia magnetic sensor in the selected scene; according to the invention, the design and application scenarios of the cilium magnetic sensor can be optimized.

The invention relates to a state diagnosis method for a mutual inductor, and the method comprises the following steps: monitoring the mutual inductor through an optical fiber sensor, and obtaining monitoring data; wherein the monitoring data comprises temperature change and mechanical stress distribution of the mutual inductor; obtaining a magnetic field distribution condition in the mutual inductor based on the temperature change and the mechanical stress distribution through the fluxgate sensor; constructing a three-dimensional magnetic field distribution diagram based on the magnetic field distribution condition through a preset inverse problem algorithm; evaluating the characteristics of the mutual inductor based on the three-dimensional magnetic field distribution diagram to obtain an evaluation result; if the evaluation result shows that the characteristics of the mutual inductor are abnormal, analyzing and diagnosing the three-dimensional magnetic field distribution diagram based on the evaluation result to obtain a diagnosis report; the technical problem that it is difficult to accurately capture subtle changes of the mutual inductor in the operation state in real time is solved.

The invention relates to a method for determining the position of a body part in a magnetic resonance imaging (MRI) system, the method comprising the following steps: positioning the body part on a body part cushion on a patient table (4) of the MRI system; determining a magnetic stray field with a magnetic field sensor (2) arranged in or on the body part cushion to thus determine position data; transmitting the position data to an evaluation unit by means of a transmission means; determining the position of the body part in the MRI system based on the position data and the fact that the body part is positioned on the body part cushion, by means of the evaluation unit. The invention further relates to a corresponding method for determining a specific absorption rate of a body part in a MRI system, a body part cushion, and a MRI system.

An apparatus that may be a wireless device. The apparatus configured to obtain an indication of a location of the wireless device, measure a magnetic field at the location of the wireless device, and output, for a network device, information regarding the location of the wireless device and the measured magnetic field at the location of the wireless device. An apparatus that may be a network device. The apparatus configured to obtain one or more sets of information regarding one or more magnetic field measurements at one or more wireless devices, generate, based on the one or more sets of information, a mapping of positions in space to magnetic field information, and output, for at least one wireless device, mapping information based on the mapping of the positions.

A position sensor for measuring signals indicative of location and / or orientation a catheter's distal end, and a method of fabrication thereof are disclosed. The position sensor includes a flexible circuit board (FCB) and at least three surface mount coil devices (SMD coils) arranged thereon for sensing different aspects of one or more magnetic fields, which are indicative of the location and / or orientation of the catheters distal end. The FCB is furnished at the sensor in folded / rolled state such that the magnetic flux axes of at least three of the SMD coils are not co-planar to thereby enable utilizing signals measured thereby determine the at least one of the orientation and location of the sensor relative to one or more magnetic field sources.

The invention discloses an electromagnetic signal superconducting observation system based on micro-shielding and thermal management and a design method, and the system comprises a high-temperature sensor unit which comprises a pressure-resistant constant-temperature container, a specially-made non-magnetic glass Dewar flask disposed in the pressure-resistant constant-temperature container, and a built-in three-axis high-temperature superconducting sensor. The pressure-resistant constant-temperature container comprises a base body made of carbon fiber reinforced plastics, and a low-frequency frequency-selecting shielding layer, an insulating thin layer, an absorbing layer and a high-frequency shielding layer are sequentially arranged outside the base body. According to the invention, the interference of high-frequency noise in a complex environment and the thermal noise of the three-axis high-temperature superconducting sensor can be significantly reduced. According to the system provided by the invention, the low-noise electromagnetic signal detection of the high-temperature superconducting sensor can be realized in a complex environment, the application range of electromagnetic method technology resource exploration can be widened, and the detection precision can be improved.

To provide a magnetic sensor device in which influence of stress applied is suppressed.SOLUTION: A magnetic sensor device 1 comprises magnetic sensors 10, 20, 30, and a support medium 4. The center of mass of an element arrangement area of the magnetic sensors 10, 20, 30 is displaced from center of mass C4 of a reference plane 4a of the support medium 4. Each of the magnetic sensors 10, 20, 30 includes four resistance parts composed of a plurality of MR elements. Magnetization of a free layer 54 in two resistance parts contains a component in a third magnetization direction. Magnetization of the free layer 54 in each of the remaining two resistance parts contains a component in a fourth magnetization direction opposite to the third magnetization direction.SELECTED DRAWING: Figure 8

The invention discloses an electric leakage detection method of an explosion-proof distribution box, particularly relates to the technical field of electric power safety in flammable and explosive environments, and is used for solving the problems of electric leakage signal attenuation and insufficient detection sensitivity caused by an eddy current effect of a metal explosion-proof shell. An original electric leakage signal of a wire in a box is obtained, and an eddy current compensation factor is constructed based on the material and thickness of a shell to carry out gain compensation; shell surface temperature distribution and three-dimensional magnetic field components are synchronously collected, and a compensation failure state is judged through collaborative analysis of high-temperature area migration acceleration and magnetic field polarization angle offset; when the compensation is effective, the area score of the space magnetic field rotation on the surface of the shell is calculated, and when the time change gradient exceeds a preset threshold value, the tripping action is triggered, the shielding effect of shell eddy current on weak electric leakage signals is broken through, and high-sensitivity electric leakage protection is realized while the explosion-proof integrity is maintained.

A rearview assembly includes a mount having a first end and a second end that includes a first joint portion and a main unit including a planar front face secured to a housing. The housing has a second joint portion disposed opposite the planar front face. The socket rotatably receives the ball joint portion such that the main unit is articulable on the mount along three perpendicular axes. The assembly further includes an asymmetrical magnetic unit secured to the first joint portion. a sensor mounted in the housing of the main unit and positioned in proximity to the asymmetrical magnet unit, and a processor in communication with the sensor to receive magnetic field information from the sensor and to determine a position of the main unit in relation to the mount based on the magnetic field information.