353results about "Three-component magnetometers" patented technology

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.

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.

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.

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 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 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 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 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.

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.

An error calibration method of a nitrogen-vacancy center (NV) vector magnetometer is disclosed. The method includes acquiring corresponding magnetic field intensity NV vector magnetometer measured data in various postures and constructing an error expression of the NV vector magnetometer. The error expression of the NV vector magnetometer is a relational expression among the magnetic field intensity measured data, magnetic field intensity real data and an error coefficient and the error coefficient includes a combination coefficient and a zero-bias error coefficient. All the magnetic field intensity measured data are fit based on an ellipsoid fitting method. The error coefficient is solved to obtain a determined error coefficient. The determined error coefficient is substituted into the error expression of the NV vector magnetometer to obtain an error model of the NV vector magnetometer. The magnetic field intensity measured data is substituted into the error model of the NV vector magnetometer.

The invention provides an error correction method suitable for a three-component magnetic sensor, and the method comprises the steps: building a comprehensive error model of a non-orthogonal error, a sensitivity error and a zero offset error, and solving an error parameter through an intelligent optimization strategy fusing a particle swarm optimization algorithm and a firefly algorithm, thereby achieving the error correction of the three-component magnetic sensor. The method specifically comprises the steps of using a magnetometer to synchronously measure a geomagnetic field module value as a reference standard, combining collected three-component magnetic field data to construct a fitness function, searching an optimal error parameter set by using a particle swarm optimization and firefly fusion algorithm, and compensating the magnetic field data; according to the method, an intelligent optimization strategy based on particle swarm optimization and firefly algorithm fusion is adopted, the magnetic field measurement precision can be effectively improved, and high-precision solving of error parameters and accurate compensation of magnetic field data are achieved.

According to the three-axis real-time magnetic field measurement method and device based on the elliptically polarized light SERF atom magnetometer, three-axis magnetic field information is coded through the asymmetrical coupling characteristic of elliptically polarized light, z-axis magnetic field signal components with different frequencies are synchronously demodulated based on a calculation module of an FPGA, and therefore effective superposition of z-axis magnetic field information is achieved; the method comprises the following steps of: 1, performing sideband demodulation on a differential amplification signal which takes elliptically polarized light as pumping light, acts on an atomic gas chamber, is converted by a polarization differential detection module and is output by utilizing an FPGA (Field Programmable Gate Array)-based calculation module in an elliptically polarized light SERF atom magnetometer system; respectively extracting a sum frequency signal component P + and a difference frequency signal component P-containing different z-axis magnetic field information; step 2, carrying out combined processing on P + and P-to generate a comprehensive data signal containing richer three-axis magnetic field information; and step 3, decoupling the signal into a magnetic field intensity component in an orthogonal direction, and forming a three-axis real-time magnetic field measurement result as a magnetometer signal output.

A data logger comprising a sensor interface for connecting at least one sensor or actuator to the data logger; an accessible memory (SD card) for storing data received from said at least one sensor or actuator; and a controller for controlling operation of the data logger wherein said data logger comprises a plurality of modules, each module having a housing electrically and mechanically connectable to a housing of an adjacent module; and wherein at least one module comprises the sensor interface and acts as a logging and / or actuation module (LAM) including at least a portion of said accessible memory (SD card); and at least one module connected to said at least one LAM acts as a control and communications module (CCM) and comprises the controller that controls communications within and external to the data logger.

The invention provides an atomic magnetometer, an atomic magnetometer measurement system and a magnetic field measurement method, the atomic magnetometer comprises a laser, a probe, a magnetic field generation unit and a magnetic field compensation unit, the probe is connected with the laser through a polarization-maintaining collimation optical fiber, and light emitted by the laser is introduced as pump light; the probe is used for splitting the pump light and forming two beams of light which are vertical and not intersected in the air chamber 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 is used for generating a magnetic field signal at the air chamber based on modulation signals in three directions, and the magnetic field compensation unit is used for compensating a magnetic field to be measured in three directions to zero based on the modulation signals in three directions, the first detection signal and the second detection signal, and measuring to obtain the magnetic field to be measured. According to the atomic magnetometer, the atomic magnetometer measurement system and the magnetic field measurement method provided by the invention, the bandwidth range of measurement can be improved.

In an embodiment, a method includes wirelessly transmitting power using a transmitter LC tank of a wireless power transmitter, wirelessly receiving power from the transmitter LC tank using a receiver LC tank of a wireless power receiver, interrupting wirelessly transmitting power for a slot period, during the slot period, measuring a receiver signal associated with the receiver LC tank, transmitting receiver data based on the measured receiver signal to the wireless power transmitter, determining a power loss associated with the wirelessly transmitting power based on the measured receiver signal and detecting a metallic object based on the determined power loss.

A system and a method of calculating the current consumption of components in a vehicle are disclosed. The system may include a controller and a memory stored thereon instructions for executing the method. The method comprising: receiving from at least one magnetic flux sensor located at a known location in the vehicle, a magnetic flux pattern at various frequencies, indicative of the magnetic field at the location; identifying at least one first magnetic flux maximum at a first frequency corresponding to a first component of the vehicle; and calculating a first current consumption of the first component based on the at least one first magnetic flux maximum.

The invention belongs to the technical field of magnetic field measurement, and particularly relates to an omnidirectional high-sensitivity magnetic field sensor. The sensor comprises a magnetic ring antenna bin cover, a sensor shell, a sensor structure main body, an aviation plug and active amplification module, a three-axis antenna body and a sensor base, wherein the three-axis antenna body is composed of three magnet ring antennas which are perpendicular to one another, and the three magnet ring antennas are installed in the sensor structure main body and are fixed by the magnet ring antenna bin covers respectively; the tail end output of the magnetic ring antenna is connected to the aviation plug and active amplification module through a coaxial interface for small signal amplification and external signal output; the aviation plug and the active amplification module are fixed on the sensor base, and the sensor shell is fixed on the sensor base, so that the overall packaging of the sensor is realized; the magnet ring antenna adopts a single-shaft high-magnetic-conductivity inner core magnet ring antenna structure, and the transverse-longitudinal ratio of the high-magnetic-conductivity inner core / and the length and diameter D of the coil are determined according to the requirements of magnetic conductivity, output voltage and signal-to-noise ratio.

The invention relates to the technical field of magnetic resonance compatibility, and discloses a method for setting a magnetic resonance compatible position of equipment, a storage medium and a related device. The method comprises the following steps: S100, acquiring the real-time magnetic field intensity of three axes of the position of the equipment through a three-axis magnetic field sensor; s200, comparing the real-time magnetic field intensities of the three axes with boundary magnetic field intensities of the three axes of boundary points of the safety area respectively, judging whether the real-time magnetic field intensities of the three axes are smaller than the boundary magnetic field intensities of the three axes of any boundary point respectively, if not, sending alarm information to a user, judging the magnetic field lowering direction according to the real-time magnetic field intensities, and sending the alarm information to the user. The magnetic field lowering direction is indicated on a display interface of the equipment, and a user is guided to move the equipment towards the magnetic field lowering direction. Through the method, a doctor can be guided to move the equipment to a safe area which does not interfere with the nuclear magnetic resonance imager every time the equipment is used, and the situation that the diagnosis process is affected due to the improper position of the equipment is avoided.

A magnetic sensor is provided for determining the three components X, Y, and Z of an incident magnetic field in a three-dimensional Cartesian coordinate system. The magnetic sensor comprises a pair of first magnetoelectric conversion elements located in the first and third quadrants, and a pair of second magnetoelectric conversion elements located in the second and fourth quadrants, wherein the pair of first magnetoelectric conversion elements have a magnetosensitive axis along a first axis obtained by rotating the X or Y axis by 45 degrees, and the pair of first magnetoelectric conversion elements are arranged so that the positive directions of their magnetosensitive axes are opposite to each other, and at least one of the pair of first magnetoelectric conversion elements has an electrode pair arranged along the first axis, and the pair of second magnetoelectric conversion elements have a magnetosensitive axis along a second axis perpendicular to the first axis, and the pair of second magnetoelectric conversion elements are arranged so that the positive directions of their magnetosensitive axes are opposite to each other, and in the XY plane, the area of ​​the virtual rectangle formed by connecting the adjacent points of the pair of first magnetoelectric conversion elements and the pair of second magnetoelectric conversion elements is smaller than the area of ​​the magnetoelectric conversion elements.

The invention concerns a handheld mobile device for determining a safety hazard due to magnetic fields, in particular a mobile phone, comprising a sensor unit comprising at least one magnetic field sensor and a position sensor; wherein the magnetic field sensor is configured to measure a magnetic field vector of an environment of the handheld mobile device; wherein the position sensor is configured to measure a position information of the handheld mobile device; a processing unit configured to calculate magnetic field data based on the measured magnetic field vector and the position information, wherein the magnetic field data comprises at least one of a strength of a magnetic field, magnet field gradient, a magnetic force, and electromagnetic induction, and determine whether the handheld mobile device is in a range of a magnetic fringe field of a Magnetic Resonance system based on the calculated magnetic field data. The invention further concerns a method for determining a safety hazard due to magnetic fields for a handheld mobile device, in particula2r a mobile phone.

The invention provides a single-axis magnetic gradient detection method and system based on an active attitude, and relates to the field of single-axis magnetic gradient detection.The method comprises the steps that the attitude of a carrier is adjusted according to the magnetic gradient detection requirement; acquiring magnetic gradient information, position information of a carrier and attitude information of the carrier; constructing an inversion equation of active attitude single-axis magnetic gradient detection data; and obtaining three-dimensional magnetic distribution of the detection space by combining the magnetic gradient information, the position information and the attitude information with an inversion equation. According to the technical scheme, a solution can be provided for single-axis magnetic gradient detection of the dynamic load platform, and the detection efficiency and the detection precision are effectively improved by actively utilizing the attitude change information.

This aerosol generating device may comprise: a cavity; a heater for heating an article inserted into the cavity; a magnetic sensor disposed in the cavity; at least one processor for receiving a detection result from the magnetic sensor and controlling driving of the heater; and a memory operatively connected to the at least one processor and storing executable instructions. The at least one processor may execute the instructions stored in the memory to control driving of the heater according to magnetic information detected by the magnetic sensor, and to determine whether the article has been reused, depending on whether an intensity of a magnetic field with respect to the magnetic information detected by the magnetic sensor is less than or equal to a reference value. Various other embodiments are possible.

This invention discloses a mode calibration method, device, pen, and storage medium for a capacitive pen, relating to the field of capacitive pen technology. The mode calibration method includes: acquiring the magnetic field strength of a 3D Hall switch in a first direction and a second direction when the pen cap is rotated to a first switch position and a second switch position, respectively; calculating a first angle value and a second angle value of the 3D Hall switch when the pen cap is rotated to the first switch position and the second switch position, respectively, based on the magnetic field strength; saving the sum of the first angle value and a preset calibration value as a first threshold angle, and saving the difference between the second angle value and the preset calibration value as a second threshold angle; updating angles less than or equal to the first threshold angle as a first mode angle range, updating angles greater than the first threshold angle and less than the second threshold angle as a second mode angle range, and updating angles greater than or equal to the second threshold angle as a third mode angle range. The technical solution provided by this invention enables precise switching between multiple modes of the capacitive pen.

The present invention provides a vibration and noise suppression method and a magnetic field detection system based on vector total field synthesis for magnetic field detection, including: respectively collecting magnetic field quantities in a first direction, a second direction, and a third direction of a magnetic field to be measured; any two of the first direction, the second direction, and the third direction are perpendicular to each other; calculating the total magnetic field quantity after adding the preset bias quantity corresponding to each direction to the magnetic field quantity in each direction, and calculating the segmented power spectrum of the total magnetic field quantity according to the spectrum estimation method; based on the segmented power spectrum in the concerned frequency band and the mapping relationship between the bias quantity in each direction and the noise bias value of the total magnetic field, solving for the minimum value of the noise bias value in the concerned frequency band and the corresponding bias quantity in each direction, so as to obtain the total magnetic field quantity after noise reduction. The present invention can effectively weaken the attitude sensitivity brought by the vector detector, and at the same time make the low-frequency noise of the synthesized total field smaller, thereby improving the anti-interference ability and sensitivity of the detector.

According to the single-beam miniaturized triaxial SERF atom magnetometer, through a compact and reasonable internal light path design, incident light introduced by a single light source is divided into two beams of pump light which are perpendicular to each other and are spatially separated through a designed combined polarization splitting prism, and then the two beams of pump light act on different atom ensembles through the same alkali metal gas chamber, so that the single-beam miniaturized triaxial SERF atom magnetometer is obtained. The device can effectively improve the crosstalk problem of simultaneous measurement of three-axis magnetic fields, has the characteristics of low cost, high space utilization rate, high reliability, high stability, easiness in miniaturization and the like, and is characterized by comprising Y-axis circular polarization pump light penetrating through an alkali metal gas chamber in the positive direction of the Y axis and Z-axis circular polarization pump light penetrating through the alkali metal gas chamber in the negative direction of the Z axis, and the Y-axis circular polarization pump light and the Z-axis circular polarization pump light are in a spatial separation state in the alkali metal gas chamber.