134results about "Magnetic sensor arrays" patented technology

The invention provides an anti-stray magnetic field rotation angle detection method and system for a three-way sensor, and relates to the technical field of sensor signal processing and motor control, and the method comprises the steps: enabling the three-way sensor to be fixed on a circuit board at an interval of 120 degrees, the sensing axes of the sensors face the rotating part with the permanent magnet together, and the magnetic field direction of the permanent magnet is perpendicular to the sensing axes. The sensor collects three paths of mixed signals containing real angle signals and spurious interference generated when the rotating component rotates, then the signals are subjected to Clark transformation to generate two-phase orthogonal signals, and then anti-interference digital signals are obtained through differential processing and analog-to-digital conversion. Then, a deep learning network based on an attention mechanism is adopted to perform feature enhancement on the signals, and finally, the angle of the rotating part is accurately determined by using an angle calculation algorithm based on the enhanced signals. According to the invention, the accuracy and reliability of angle detection in a strong stray magnetic field interference environment are improved.

The invention belongs to the technical field of battery detection, and particularly relates to a battery module internal short circuit detection method and system based on magnetic field detection. Comprising the steps of constructing a three-dimensional magnetic field sensing array; screening an effective observation window based on quasi-static logic, and triggering a magnetic sensor in the effective observation window to carry out magnetic induction intensity data acquisition; decoupling of background magnetic field and topology current-carrying contribution magnetism is carried out on the original magnetic induction intensity data, and residual magnetic field features are obtained; inputting the residual magnetic field features into the constructed physical constraint neural network model, and inverting the reconstructed current density based on physical driving; and dividing the battery states into different safety levels by adopting a multi-level fault response strategy based on the reconstruction current density, and completing the internal short circuit detection of the battery module. According to the invention, short circuit detection in the battery module is realized based on magnetic field three-dimensional array perception in combination with a physical constraint deep learning model, and an optional implementation path is provided for early accurate diagnosis of short circuit faults in the battery module.

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.

A method for separating spacecraft generated magnetic noise from geomagnetic field data, comprising: detecting magnetic information and outputting a representative detection signal, the magnetic information comprising magnetic noise and geomagnetic field data; receiving the representative detection signal including the magnetic information and resolving the magnetic noise data and the geomagnetic field data; and outputting a resultant signal representative of at least a geomagnetic field data signal.

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.

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.

A method of characterising a condition of an electrochemical cell 100 comprising a plurality of electrodes, the method comprising: positioning one or more magnetometers 200 adjacent to an electrode surface of the electrochemical cell to measure magnetic field of the electrochemical cell at a first location 202; measuring the magnetic field generated by the electrochemical cell for a predetermined length of time, the measuring providing a first temporal profile of the magnetic field in an x-direction and a second temporal profile of the magnetic field in a y-direction, at the first location; confirming occurrence of a transient current inhomogeneity within the electrochemical cell based on identifying a step-change in an x-component of the magnetic field from the first temporal profile and a coincident step-change in a y-component of the magnetic field from the second temporal profile; and determining a characteristic of the electrochemical cell based on the occurrence of transient current inhomogeneities.

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.

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.

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.

A sensor, comprising: a first signal path including a plurality of magnetoresistance (MR) elements, the first signal path being configured to generate a first signal based, at least in part, on an output of the MR elements, the output of the MR elements being generated, at least in part, in response to an external magnetic field that is incident on the sensor and a first feedback magnetic field; a second signal path including one or more Hall elements, the second signal path being configured to generate a second signal based, at least in part, on an output of the Hall elements; a first feedback coil that is configured to generate the first feedback magnetic field, the first feedback coil being driven with a first drive current, the first drive current being generated, at least in part, based on the first signal.

Apparatus and associated methods relate to measuring position and displacement of a 2D surface magnet array of at least three adjacent magnetic north and south tracks with an acute angle versus its motion displacement relative to a magnetic field sensor (e.g., magnetic sensing probe). In an illustrative example, the geometry of the 2D surface magnet array may be planar with adjacent and alternating north and south pole regions. In some embodiments, the 2D surface magnet array geometry may take the form of (1) an axial cylindrical helical multipole magnet array having individually magnetized layers that are oriented in helical shape, or (2) a radial disk spiral multipole magnet array with at least three adjacent north and south tracks oriented as a spiral shape.

A sensor, comprising: a first signal path including a plurality of magnetoresistance (MR) elements, the first signal path being configured to generate a first signal based, at least in part, on an output of the MR elements, the output of the MR elements being generated, at least in part, in response to an external magnetic field that is incident on the sensor and a first feedback magnetic field; a second signal path including one or more Hall elements, the second signal path being configured to generate a second signal based, at least in part, on an output of the Hall elements; a first feedback coil that is configured to generate the first feedback magnetic field, the first feedback coil being driven with a first drive current, the first drive current being generated, at least in part, based on the first signal.

A directional tool and a method of surveying a wellbore with the directional tool in a borehole string are provided. A first sensor of the directional tool is disposed in a non-uniform ambient magnetic field. A first applied magnetic field is applied to the first sensor. A first measurement is obtained at the first sensor while the first sensor is disposed in the non-uniform ambient magnetic field and the first applied magnetic field is applied. A second applied magnetic field is applied to the first sensor. A second measurement is obtained at the first sensor while the first sensor is disposed in the non-uniform ambient magnetic field and the second applied magnetic field is applied. The directional tool is calibrated based on the first measurement and the second measurement. Downhole survey measurements are obtained in the wellbore with the calibrated directional tool.

Various embodiments disclosed herein comprise a system. The system comprises a coil, a magnetic field sensor, and a controller. The coil generates a spatially and temporally varying magnetic field. The magnetic field sensor measures the magnetic field and a background magnetic field. The magnetic field sensor provides a magnetic field measurement and a background magnetic field measurement to the controller. The controller determines the position and orientation of the magnetic field sensor based on the magnetic field measurement and the background magnetic field measurement. The controller transfers control signaling to modify the magnetic field based on the position and orientation of the magnetic field sensor to null the background magnetic field. The coil receives the control signaling and modifies the spatially and temporally varying magnetic field based on the control signaling to null the background magnetic field.

To simplify the installation of a position detection sensor, a detection unit generates a detection signal corresponding to the position of a magnet mounted on a displacement body. A specification unit specifies the position of the displacement body in the first direction based on the detection signal generated by the detection unit. A determination unit generates determination information based on the position of the displacement body and predefined detection areas. An adjustment unit is capable of adjusting the positions of the first and second regions defined as detection areas and adjusts at least one of the number or width of the detection areas.

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 magnetic sensor includes at least one MR element and at least one magnetic field generator configured to generate a bias magnetic field. The at least one magnetic field generating body has a first end portion and a second end portion, and includes a first portion including the first end portion and a second portion including the second end portion. The film thickness in the first portion is greater than the film thickness in the second portion. The at least one MR element has a third end portion and a fourth end portion, and is configured such that an interval between the first end portion and the third end portion is smaller than an interval between the second end portion and the fourth end portion.

Systems, methods, and computer readable medium are provided for reducing an undesired magnetic field generated by an electric motor of a vehicle. Reducing an undesired magnetic field generated by an electric motor of a vehicle includes receiving from at least one magnetic field sensor sensing data indicative of the undesired magnetic field emitted into a selected region of a passenger compartment of the vehicle; determining a cancelation magnetic field for at least reducing the undesired magnetic field emitted by the electric motor into the selected region; and directing electrical signals to at least one magnetic field generator positioned in at least one of a passenger seat, a vehicle door, or a frame of the vehicle, for causing the at least one magnetic field generator to generate the cancelation magnetic field for at least reducing the undesired magnetic field emitted by the electric motor through the selected region.

The invention relates to the technical field of grounding systems, in particular to an earth surface magnetic field vector imaging method and system for a grounding system conduction test, and the system comprises a measurement area building unit which is used for building an earth surface magnetic field measurement system for the conduction test, completing earth surface magnetic field measurement wiring for the conduction test, and forming an earth surface magnetic field measurement area; the resultant magnetic field imaging unit is used for measuring earth surface vector magnetic field data based on the earth surface magnetic field measurement area and completing three-dimensional resultant magnetic field imaging; and the additional synthetic magnetic field unit is used for taking out a characteristic measuring line according to the three-dimensional synthetic magnetic field imaging result of the earth surface synthetic magnetic field and completing data sampling of additional synthetic magnetic fields at different heights according to local peak value positions of the characteristic measuring line. By judging the specific burial depth of the grounding grid and the through-flow current on each branch conductor, the frame position and the specific burial depth of the grounding grid can be clearly determined, the excavation detection of the grounding grid can be better assisted, and the detection and excavation efficiency of the grounding grid is improved.

A magnetism measurement device according to the present invention includes: a first magnetic sensor (An) that detects magnetism acting along a first direction, the first direction being chosen arbitrarily; a second magnetic sensor (Bn) that detects magnetism acting along a second direction, the second direction crossing the first direction along which the first magnetic sensor detects magnetism; and a magnetic-field generating part (Cn) that generates a magnetic field in response to a flow of current. The magnetic-field generating part (Cn) is incorporated such that magnetism act along the first direction and the second direction in response to a flow of current in a state where the positions thereof facing the first magnetic sensor (An) and the second magnetic sensor (Bn) are fixed.

The present invention provides a magnetic sensor capable of eliminating the AC component contained in an ambient magnetic field. The magnetic sensor (1) comprises: an ambient magnetic field sensor (S0) that generates an ambient magnetic field signal (F0), a detection magnetic field sensor (S1) that generates a detection magnetic field signal (F1), a capacitor (C) that extracts the DC component by removing the AC component of a predetermined frequency band from the ambient magnetic field signal (F0), a compensation coil (31) that applies magnetic field elimination to the detection magnetic field sensor (S1) based on the DC component, a compensation coil (41) that applies magnetic field elimination to the detection magnetic field sensor (S1) based on the detection magnetic field signal (F1), and a bandpass filter (91) that removes at least the AC component of a predetermined frequency band from the detection magnetic field signal (F1). Thus, the AC component contained in the ambient magnetic field can be eliminated regardless of the positions of the ambient magnetic field sensor and the detection magnetic field sensor.

An embodiment of the present invention relates to a subassembly for a sample compartment of a spectrometer. The subassembly includes a sample support adapted to support one or more sample holders for use in the sample compartment. The sample support is associated with one or more magnets. The subassembly further includes a sensor assembly configured to detect the one or more magnets associated with the sample support to identify a mode of operation of the spectrometer corresponding to the sample support.

A magnetic sensor includes a plurality of first MR elements and a plurality of second MR elements. Each plurality of first MR elements and the plurality of second MR elements has a resistance value change characteristic where a resistance value changes in accordance with a stable state of magnetic vortex structure, under same strength of an applied magnetic field. A statistical distribution of resistance change amount of plurality of first MR elements forms a first distribution centered on a first value. A statistical distribution of a resistance change amount of the plurality of second MR elements forms a second distribution centered on a second value. A group including the plurality of first MR elements and the plurality of second MR elements has a characteristic where a statistical distribution of a resistance change amount forms a third distribution centered on a third value between the first value and the second value.

A magnetoresistive sensor with harmonically broadened linear range comprises a substrate (100) and a multiple push-pull magnetoresistive sensing bridge arms. The push arms (91) of the sensing bridge comprise N types of push magnetoresistive sensing units (94). The pull arms (92) comprise N types of pull magnetoresistive sensing units. Key characteristic parameters of each magnetoresistive sensing unit comprise R0i, MRi, Hsi, ±αpi and ai. The Key characteristic parameters of the push magnetoresistive sensing units (94) and corresponding pull magnetoresistive sensing units are different from the key characteristic parameters of standard magnetoresistive sensing unit of a standard push-pull linear magnetoresistive sensor. There is at least one set of key characteristic parameters [(R0j, MRj, Hsj, ±αpj), aj]. Linear parts and nonlinear harmonic parts of R-H characteristic parameters that characterize the push magnetoresistive sensing units and the pull magnetoresistive sensing units are superimposed, so that the linear range of the multiple push-push magnetoresistive sensing bridge is greater than the linear range of the standard push-pull linear magnetoresistive sensor.

The application discloses a temperature drift compensation method for a micro crystal oscillator chip, and particularly relates to the field of temperature drift compensation performed by electromagnetic interference signal measurement, and comprises the following steps: arranging a dual-axis Hall sensor array around a temperature sampling channel of the micro crystal oscillator chip, collecting spatial distribution of low-frequency electromagnetic fields in the chip operating environment, and generating an electromagnetic disturbance signal for representing parasitic electromagnetic interference behavior; performing hetero-frequency convolution processing on the electromagnetic disturbance signal and a thermal response signal obtained in the temperature sampling channel, extracting a coupling response feature related to the electromagnetic interference behavior, and constructing a spectrum fitting template of the electromagnetic parasitic injection behavior. By synchronously introducing a low-frequency electromagnetic disturbance perception channel outside the temperature sampling path, an interference identification, stripping and compensation dynamic linkage mechanism is constructed to realize active detection and correction of the latent electromagnetic interference component in the temperature response signal, thereby solving the problems of frequency compensation misadjustment and long-term offset accumulation in the prior art.

The application relates to the technical field of aerospace space electromagnetic propulsion, in particular to a high-frequency rotating magnetic field transient magnetic field configuration measuring system and method, the system comprises a high-frequency rotating magnetic field, a three-axis inductive magnetic probe, a signal transmission bus and an oscilloscope, wherein: a plurality of three-axis inductive magnetic probe arrays are uniformly distributed in the high-frequency rotating magnetic field to be measured; one end of the signal transmission bus is fixed at the boundary of the high-frequency rotating magnetic field region to be measured, and the other end is connected with the oscilloscope; the signal transmission line of each three-axis inductive magnetic probe is connected with the signal transmission bus; the oscilloscope is internally provided with a data processing system, which is used for collecting inductive magnetic field signals and processing the same, and displays the configuration and dynamic change of the high-frequency rotating magnetic field to be measured in real time. The application is suitable for transient rotating magnetic field configuration detection with a frequency of 0-1 MHz, and the known inductive magnetic probe, the oscilloscope and other instruments are combined skillfully to have the ability of high-frequency magnetic field measurement.

A magnetic sensor includes a first MR element and a second MR element, and a first magnetic field generator and a second magnetic field generator. Each of the first magnetic field generator and the second magnetic field generator includes a ferromagnetic portion and an antiferromagnetic portion to be exchange-coupled with the ferromagnetic portion. The first magnetic field generator is configured to generate a first magnetic field including a first component in a first direction, and to apply the first component to the first MR element. The second magnetic field generator is configured to generate a second magnetic field including a second component in a second direction, and to apply the second component to the second MR element.

Disclosed in the embodiments of the present invention is a low-magnetic-field magnetoresistive angle sensor. The sensor comprises: a substrate located in an X-Y plane, and a magnetoresistive sensing unit located on the substrate. The magnetoresistive sensing unit comprising a multi-layer thin film structure. The multi-layer thin film structure comprises at least a stack of a free layer, a barrier layer, and a reference layer. The magnetoresistive sensing unit has an oval shape. The oval-shaped free layer has a long axis Ly, a short axis Lx, and a thickness Lz. Additionally the free layer has a saturation magnetic field, a shape anisotropy demagnetizing field, and a magnetocrystalline anisotropy field in the X direction. When an external magnetic field rotates by 0-360° in the X-Y plane, the magnetocrystalline anisotropy field is compensated by the shape demagnetizing field to cause the effective anisotropy field of the free layer to be close to 0, such that the external magnetic field has a low working magnetic field value close to that of the saturation magnetic field of the free layer material. The embodiments of the present invention can improve the accuracy of angle measurement of a magnetoresistive angle sensor. Additionally because the required external magnetic field is low, the sensor can be implemented at low cost.

The invention discloses a distributed magnetic field sensing system and method based on a magnetic domain regulation FBG array and deep learning-Kalman filtering demodulation, and belongs to the technical field of optical fiber sensing and magnetic field measurement. The system comprises a tunable laser, an optical circulator, a magnetic domain regulated FBG sensing array, an OFDR module, a data acquisition module and a signal processing unit. The core is that the FBG sensing array enables each FBG to have different magnetic field sensitivity and measuring range through a differential magnetic domain regulation and control technology; and the signal processing unit adopts a deep learning algorithm to process an OFDR signal, and performs dynamic optimal estimation in combination with Kalman filtering, so that high-precision and wide-range distributed magnetic field measurement is realized, and meanwhile, temperature cross sensitivity is effectively decoupled. The invention solves the problem that the prior art cannot consider the measurement range, precision and anti-interference capability at the same time, and is especially suitable for magnetic field monitoring in complex environments such as transformers and space detection.