244results about "Three-component magnetometers" patented technology

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.

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 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.

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 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 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.

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.

In a magnetic field detection device capable of detecting a weak magnetic field without using a shield room, the number of components is reduced, and the circuit structure is simplified. A magnetic field detection device (1) includes: a cancellation coil (C2) wound around a winding core portion (13) of a bobbin (10); magnetic sensors (S1, S21-S24) fixed to mutually different positions of the bobbin (10); and a feedback circuit (31) that cancels an ambient magnetic field of a cancellation space by causing a cancellation current to flow through the cancellation coil (C2) in accordance with an output signal of the magnetic sensor (S1). The magnetic sensors (S21-S24) are disposed within the cancellation space. In this way, a common cancellation coil (C2) is used for the magnetic sensors (S1, S21-S24), so the number of components can be reduced, and the circuit structure can be simplified.

A magnetic sensor includes a first half-bridge circuit, a second half-bridge circuit, and a holding member. The first half-bridge circuit includes a first magnetoresistive effect element and a second magnetoresistive effect element. The second half-bridge circuit includes a third magnetoresistive effect element and a fourth magnetoresistive effect element. The first magnetoresistive effect element detects a magnetic field aligned with an X-axis. The second magnetoresistive effect element detects a magnetic field aligned with a Y-axis. The third magnetoresistive effect element detects a magnetic field aligned with a first axis. The fourth magnetoresistive effect element detects a magnetic field aligned with a second axis.

Disclosed are methods and devices for detecting retained surgical items or other objects having a magnetic signature within a corpus of a patient. The device can comprise a handle, a shaft extending from the handle, and a distal sensing portion positioned distally of the shaft. The distal sensing portion can comprise one or more gradiometers comprising a plurality of magnetometers. The device can further comprise one or more output components configured to generate a user output to alert a user of a detected object.

The invention relates to a method for providing position information of an object (120) with a three-dimensional magnetic field strength sensor (125, 126) in the vicinity of a device (100) generating a magnetic stray field, comprising: providing (40) B0 reference data of the magnetic stray field at least along a first spatial direction, wherein the first spatial direction is orthogonal to a second spatial direction and a third spatial direction, and wherein the B0 reference data is provided along the first spatial direction at a predefined position in the second and third spatial directions; arranging (41) the magnetic field strength sensor (125, 126) of the object (120) at the predefined position; providing (42) a measured value of the magnetic field strength sensor (125, 126) at the predefined position;Providing (43) position information of the object (120) in the first spatial direction based on the B0 reference data and the measured value.;

A soft magnetic sensor comprising a soft material containing randomly distributed magnetic microparticles and a magnetometer that can estimate force and localize contact over a continuous area. A reference magnetometer can be used to filter motion and ambient noise. Methods for locating contact and determining force comprise data analysis of the magnetometer output. In some embodiments, the sensor can localize an object prior to contact.

This disclosure describes a method for calibrating a magnetic sensor of a client device. The method may include receiving a set of magnetic field measurements, each magnetic field measurement including the device position, the orientation of the client device, and the observed magnetic field vector measured by the magnetic sensor. The method may include calculating a device correction vector for the client device based on the set of magnetic field measurements. For each magnetic field measurement, the method includes determining the world magnetic field vector at the device position of the magnetic field measurement, calculating the expected measured magnetic field vector at the device position, accessing an estimated device correction vector for the client device, calculating the expected adjusted vector for the client device, comparing the observed magnetic field vector associated with the magnetic field measurement with the expected adjusted vector, and calculating a device correction vector based on the comparison.

A magnetic sensor includes a substrate having a reference plane, a support member having an inclined surface, and a magnetoresistive element disposed on the inclined surface. The magnetoresistive element has a bottom surface, a top surface, and a first side surface and a second side surface connecting the bottom surface and the top surface. The first side surface is, as compared to the second side surface, located in front in a first direction that is along the inclined surface and that gets close to the reference plane. At least a part of the first side surface is, as compared to a first virtual plane, located close to the second side surface, and the first virtual plane intersects with a first corner present at a position at where the top surface and the first side surface intersect and is perpendicular to the reference plane.

The present application provides a magnetic field sensor and a multi-axis magnetic field sensor, and relates to the field of magnetic field measurement technology. The magnetic field sensor comprises: a magnetic flux conversion module, a magnetic induction module, and a differential detection module. The magnetic flux conversion module comprises: a magnetic field input area, a magnetic field output area, a magnetic flux direction conversion area, and a magnetic flux path connection area. The magnetic flux conversion module concentrates and amplifies a magnetic field to be measured in the magnetic field induction direction and converts it into a magnetic field component in a spatial solid angle direction with an angle of 0-90 degrees with the direction of the magnetic field to be measured. The magnetic induction module senses the magnetic field at the air gap of the magnetic flux conversion module, generates a differential voltage signal, and forms an output electrical signal to be measured through the differential detection module. This enables the conversion of the magnetic field to be measured into a magnetic field component in the opposite direction at the air gap, thereby realizing differential detection of a push-pull bridge structure using magnetic induction modules with the same sensitivity direction. It can be manufactured in an integrated manner, leading to a simple process and good sensitivity consistency, and it is easy to produce.

A magnetic sensor includes a sensor housing, a magnet, a printed circuit board assembly, a first sensor element, and a second sensor element. The sensor housing includes a pocket and a magnet opening. The magnet is disposed in the magnet opening. The printed circuit board assembly is disposed in the pocket. The printed circuit board assembly includes a first portion and a second portion. The first sensor element and the second sensor element are disposed on the second portion. The first sensor element and second sensor element are configured to measure magnetic flux density, and the magnetic flux generated by the magnet is configured to pass through the first sensor element in a first direction and pass through the second sensor element in a second direction that is opposite to the first direction.

The present disclosure describes a method for calibrating a magnetic sensor of a client device. The method may include receiving a set of magnetic field measurements, each of which includes a device location, an orientation of the client device, and an observed magnetic field vector measured by the magnetic sensor. The method may include computing a device correction vector for the client device based on the set of magnetic field measurements. For each magnetic field measurement, the method includes determining a world magnetic field vector at the device location of the magnetic field measurement, computing an expected measured magnetic field vector at the device location, accessing an estimated device correction vector for the client device, computing an expected adjusted vector for the client device, comparing the observed magnetic field vector associated with the magnetic field measurement and the expected adjusted vector, and computing the device correction vector based on the comparison.

A magnetic sensor comprises a substrate with a reference plane, a support element with an inclined surface, and a magnetoresistive element positioned on the inclined surface. The magnetoresistive element has a bottom surface, a top surface, a first side surface, and a second side surface connecting the bottom and top surfaces. The first side surface is positioned forward of the second side surface in a first direction that runs along the inclined surface and approaches the reference plane. At least a portion of the first side surface is positioned near the second side surface relative to a first virtual plane, and the first virtual plane intersects with a first corner located at the point where the top surface and the first side surface intersect and which is perpendicular to the reference plane.

The invention discloses a short baseline constraint optimization positioning method based on a magnetic moment vector modulus ratio, a measurement array and a system, and belongs to the technical field of magnetic detection and positioning. The method comprises the following steps: firstly, constructing a regular triangular prism-shaped measurement array, collecting magnetic field vector data generated by a magnetic target at each vertex measurement point of the array, and calculating a magnetic field vector at a coordinate origin of the measurement array and a vector mode gradient of the magnetic field vector; the spatial position coordinates of the magnetic target are used as decision variables, a constraint optimization model used for magnetic dipole positioning solution is established, and the target function of the constraint optimization model is a magnetic moment vector modulus ratio function; solving the constraint optimization model by adopting an adaptive differential evolution dung beetle optimization algorithm to obtain an optimal spatial position coordinate of the magnetic target; and based on the optimal spatial position coordinates, performing inversion calculation on three components of the magnetic moment vector of the magnetic target. According to the invention, the space volume of the positioning system is reduced, the positioning system is relatively simple, and the positioning error caused by the uncertainty of magnetic conductivity is also eliminated.

The invention provides a magnetic sensor and a magnetic field determination method. The magnetic sensor and the magnetic field determination method are used for determining X, Y and Z components of an incident magnetic field in a three-dimensional orthogonal coordinate system. The magnetic sensor is provided with a pair of first magnetoelectric conversion elements located in a first quadrant and a third quadrant, and a pair of second magnetoelectric conversion elements located in a second quadrant and a fourth quadrant, and the pair of first magnetoelectric conversion elements has a magnetosensitive axis along a first axis obtained by rotating an X axis or a Y axis by 45 degrees. The pair of first magnetoelectric conversion elements has a magnetosensitive axis along a first axis, the pair of first magnetoelectric conversion elements are arranged so that the positive directions of the magnetosensitive axes of the first magnetoelectric conversion elements are opposite, the pair of second magnetoelectric conversion elements has a magnetosensitive axis along a second axis orthogonal to the first axis, and the pair of second magnetoelectric conversion elements are arranged so that the positive directions of the magnetosensitive axes of the second magnetoelectric conversion elements are opposite in an XY plane. The area of an imaginary 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.

An infusion device and a method at an infusion device, wherein the infusion device comprises: a receptacle (120) configured to receive a syringe (200) comprising a plunger (202); a plunger driver (104) configured to releasably engage an end of a plunger (202) of the syringe (200) and move the plunger (202) in a longitudinal direction of the syringe (200); a driveline (105) comprising a motor (106) coupling the plunger driver (104) to move the plunger driver; a master controller (112) configured to control travel of the plunger driver (104) in at least a first direction; and an orientation sensor (114) comprising an accelerometer having a suspended mass configured to output a first signal comprising acceleration information and orientation information. The infusion device operatively controls the motor and controls movement of the plunger drive in accordance with a first determination (402) that variability of the amplitude of the first signal satisfies a first criterion and a second determination (408) that an average or median value of the amplitude of the first signal satisfies a second criterion.

The application discloses a kind of triaxial SERF atom magnetometer quadrature double frequency modulation system and method, the system utilizes signal generation module to generate frequency f m The sine quadrature modulation signal of cosine is respectively driven SERF atom magnetometer X and Y axis magnetic field generating coil, and 2nf m Frequency sine signal of driving Z axis coil, through the integral filter of 3 groups of integral period integration, the open-loop magnetic field signal of X axis, Y axis and Z axis magnetic field component is obtained, and through control module, the driving current of three-axis magnetic field coil is controlled to generate compensation magnetic field, so that the open-loop magnetic field signal of X axis, Y axis and Z axis magnetic field component is zero, at this time, the magnetic field intensity of atom chamber is zero, and the compensation current output by control module is the X, Y and Z axis magnetic field intensity signal measured by triaxial SERF atom magnetometer.The system can directly extract triaxial magnetic field calculation signal from a laser signal, and eliminate the cross-coupling effect when triaxial magnetic field is calculated, improve the measurement range and quadrature of SERF atom magnetometer, with very high engineering application value.

The application discloses a 3D Hall chip and an array chip. The 3D Hall chip comprises three magnetic induction parts, a first magnetic concentration part and three second magnetic concentration parts. Two of the three magnetic induction parts are arranged closely along a first direction, and the third magnetic induction part is arranged closely along a second direction with one of the two magnetic induction parts. The first magnetic concentration part is located on one side of the at least three magnetic induction parts in a third direction. The at least three second magnetic concentration parts are arranged on the sides of the at least three magnetic induction parts away from the first magnetic concentration part. The orthographic projection of the first magnetic concentration part on the corresponding magnetic induction part at least partially overlaps with the orthographic projection of the second magnetic concentration part on the corresponding magnetic induction part. At least part of the overlapping area is located in the sensitive center area of the corresponding magnetic induction part. The 3D Hall chip disclosed by the application can detect three-dimensional magnetic fields, and has the characteristics of high sensitivity, small volume and low cost.

An apparatus for generating magnetic field gradients, comprising (a) a first planar electromagnetic coil set configured to generate a first magnetic field gradient with respect to a first axis, (b) a second planar electromagnetic coil set configured to generate a second magnetic field gradient with respect to a second axis orthogonal to the first axis, (c) a third planar electromagnetic coil set configured to generate a third magnetic field gradient with respect to a third axis orthogonal to the first and second axes, and (d) a controller configured to selectively power the first, second, and / or third electromagnetic coil sets to sequentially generate positioning magnetic field gradients with respect to each of the first, second, and third axes, at least a portion of each positioning magnetic field gradient having a magnetic field magnitude that monotonically varies along the respective axis.