124results about "Electrodynamic magnetometers" patented technology

A system of tracking load switching operations and fault clearing operations of at least one circuit breaker in a power circuit includes at least one coil antenna sensing changes in a magnetic field around the coil antenna. The changes in the magnetic field induce corresponding changes to a current or voltage in the at least one coil antenna. A receiver is connected to the at least one coil antenna and receives the current or voltage. A computer is connected to the receiver and stores a data stream that corresponds to the changes in magnetic field around the at least one coil antenna. The computer uses the data stream to generate a plurality of characteristic magnetic field waveforms for the at least one circuit breaker. The computer assembles a low frequency magnetic signature for a respective circuit breaker from the characteristic magnetic field waveforms generated for the respective circuit breaker.

The invention provides an open-type comprehensive current sensor data analysis method, which comprises the steps of simulating asymmetric distribution of a magnetic field according to an actual offset coordinate of a guide mass center in a clamp opening coordinate system, and generating a magnetic field compensation coefficient about a current eccentric state; compensating the real-time magnetic field intensity data according to the magnetic field compensation coefficient related to the current eccentric state, and eliminating random noise to obtain calibrated symmetrical magnetic field signal distribution; generating a reference curve of dynamic measurement current and magnetic field conversion according to the optimized conductor eccentric position state description, and determining a current measurement calibration curve; performing conversion processing on the input magnetic field signal through the current measurement calibration curve so as to correct signal distortion caused by eccentricity, and obtaining a comprehensive current reading without eccentric interference; and according to the relevance between the comprehensive current reading without eccentric interference and historical reference current data, analyzing the stability of a current measurement state, and obtaining a real-time clamp operation state feedback record.

Flexible, longitudinally extended sensors comprising variably resistive and / or inductive sensing material. Sensors connect to an external processing unit using as few as 2 wires. In operation, sensors measure resistance / inductance along their longitudinal extent (curve). Spectral de-multiplexing allows electrical property differences along sensors to be resolved. This enables shape tracking of the flexible sensor. The sensor principles are suitable for the production of ultra-small diameter probes (for example, smaller than 0.5 mm) of arbitrary length (for example, 30 cm long). There are potential advantages for cost efficiency and ease of manufacture. The sensor can be constructed as a shape tracked guidewire to enable endovascular navigation procedures. The sensor's tracked shape enables deformation tracking of the anatomy. Using the sensor's tracked shape rather than repetitive X-ray imaging improves navigational accuracy and reduces exposure to radiation.

The present disclosure provides a method for optimizing a broadband noise of an inductive magnetic field sensor as well as a magnetic field sensor, including: determining a functional relationship between an induced voltage of a coil and an effective permeability of a magnetic core of the inductive magnetic field sensor; determining an equivalent voltage noise expression of a temperature variation-induced permeability noise of the magnetic core according to the functional relationship; determining a key influencing factor of the magnetic core according to the equivalent voltage noise expression of the temperature variation-induced permeability noise of the magnetic core; modifying the magnetic core according to the key influencing factor of the magnetic core to optimize the temperature variation-induced permeability noise of the magnetic core; and constructing a dual-channel composite multi-stage modulation signal-noise separation circuit to optimize a low-frequency band noise and a high-frequency band noise of the inductive magnetic field sensor.

A probe for locating a magnetic marker for use in surgery. The probe comprises at least two first coils (3a, 3b) and at least one second coil (5) which are arranged substantially coaxially on a longitudinal axis of the probe for measuring the proximity of a magnetic marker to the probe, and a baseline voltage taring device (7) comprising a first elongate conductor which defines a conducting path extending partially around the probe axis. The conducting path is configured and arranged such that in use the balancing magnetic field induces a balancing voltage in a sense coil that at least partially offsets the baseline voltage. Also disclosed is a method of manufacturing such a probe, a method of setting up such a probe for use in sensing a magnetic marker, and detection apparatus for locating a magnetic marker during surgery.

The invention belongs to the technical field of micro-electro-mechanical systems (MEMS) and the technical field of electric field / magnetic field detection, and particularly provides an electric field-magnetic field composite integrated resonant MEMS sensor which is used for solving the problem that a traditional resonant MEMS sensor can only sense a single environment parameter. According to the electric field-magnetic field composite integrated resonant MEMS sensor provided by the invention, accurate measurement of a direct-current electric field in a space thickness direction (Z axis) is realized by using an out-of-plane flapping mode of a disc resonant sensing unit fixed by four T-shaped anchor points; the measurement of an out-plane Z-axis magnetic field and an in-plane X-axis magnetic field is realized through the effect of Lorentz force on a metal wire loop which is arranged on the surface of the disc resonance sensing unit and is charged with alternating current in the magnetic field; therefore, the composite integrated sensing of two parameters of an electric field and a magnetic field by the same device is realized, and the number of required sensors and the occupied area of a chip are reduced.

Various embodiments are directed to a method and system for mapping or visualizing the magnetic fields and their associated field strengths of an object, such as a mobile computing device. An example source of the magnetic fields may be a near-field communication (NFC) reader configured in the object. A computer vision system or device may track a visual marker arranged near or on a magnetic field strength detector in order to associate, match, or map the magnetic field strength measurement readings of the detector at different positions or locations on the object. The computer vision system may generate and display a heat map of the object based on at least the magnetic field strength measurements and their relative positions.

The invention relates to a Wiegand sensor arrangement (100) comprising: a Wiegand sensor (3) with a Wiegand wire (3.2), a sensor coil (3.3) surrounding the Wiegand wire (3.2), a first field conducting element (3.4) arranged at a first end (3.2.1) of the Wiegand wire (3.2), and a second field conducting element (3.5) arranged at a second end (3.2.2) of the Wiegand wire (3.2) opposite the first end (3.2.1), as well as a printed circuit board (2) on which the Wiegand sensor (3) is arranged, wherein the first field conducting element (3.4) and the second field conducting element (3.5) each have a fastening section (3.4.4, 3.5.4), wherein the Wiegand sensor (3) is connected to the printed circuit board (2) via the fastening section (3.4.4) of the first field conducting element (3.4) and the fastening section (3.5.4) of the second field conducting element (3.5) is fastened to the circuit board (2), wherein the fastening section (3.4.4) of the first field conducting element (3.4) and the fastening section (3.5.4) of the second field conducting element (3.5) are designed such that between the sensor coil (3.3) and the printed circuit board (2) there is an installation space (6) which is laterally delimited by the fastening section (3.4.4) of the first field conducting element (3.4) and the fastening section (3.5.4) of the second field conducting element (3.5), and wherein at least one component (4, 5) is arranged on the printed circuit board (2) in the installation space (6).

A magnetic property acquisition unit detects an induced voltage caused by vibration of a measurement sample magnetized by an excitation electromagnet and acquires a magnetic property that indicates a relationship between a magnetic flux density and an external magnetic field. The magnetic flux density is a sum of magnetization of the measurement sample and the external magnetic field. When acquiring the magnetic property of the measurement sample to which pressure is being applied, a control device sets a first magnetic field value as a sweep start value, and performs sweeping with a magnetic field equal to or less than the first magnetic field value. The first magnetic field value is smaller than a second magnetic field value that is acquired before the pressure is applied to the measurement sample, and corresponds to a saturation magnetic flux density of the measurement sample to which the pressure is not being applied.

Indicator means for indicating the intensity of an alternating magnetic field of a primary conductor, wherein the indicator means has one or more lighting means, wherein the indicator means has a cubical, cuboidal, tetrahedral or polyhedral housing, wherein the indicator means has an inductor which forms a resonant circuit with a capacitor, wherein the resonant circuit can supply power to the lighting means.

The present invention discloses a preparation method and application of a bacterial cellulose-based composite nanogenerator, belonging to the field of nanogenerator and power monitoring technology. Through solution blending technology, graphene oxide and cobalt ferrite are embedded in a bacterial cellulose matrix to prepare a composite material with a stable structure. The electromagnetic properties, triboelectric properties, and mechanical stability of each composite material are systematically evaluated to screen the optimal formulation. The composite material is used to prepare a nanogenerator, and a composite structure including a friction layer and an electromagnetic induction coil is designed. By monitoring the power fluctuations output by the nanogenerator, the real-time state of the transformer's leakage magnetic field is directly reflected. The present invention utilizes the preparation method and application of the bacterial cellulose-based composite nanogenerator to achieve self-powered monitoring of power transformers, improving the accuracy and real-time performance of leakage magnetic field detection.

Apparatus, systems and processes for detection of objects representing possible projectile hazards in areas of high magnetic fields such as those potentially hazardous ferrous objects which may be moved within the region of forceful magnetic attraction by magnetic resonance imaging (MRI) scanners. The systems and process may include multiple magnetic field sensors and multiple time of flight sensors positioned around a passageway. The time of flight sensors may facilitate determination of movement (e.g., speed and / or direction) of the potentially hazardous ferrous object to provide enhanced accuracy of threat detection.

A probe for locating magnetic markers used in surgery. The probe includes: at least two first coils (3a, 3b) and at least one second coil (5), which are arranged substantially coaxially on the longitudinal axis of the probe for measuring the proximity of the magnetic marker to the probe; and a reference voltage balancing device (7) comprising a first elongated conductor defining a conductive path extending partially around the probe axis. The conductive path is configured and arranged such that, in use, a balancing magnetic field induces a balancing voltage in the sensing coil that at least partially cancels out the reference voltage. Methods for manufacturing such a probe, methods for setting such a probe for sensing magnetic markers, and detection devices for locating magnetic markers during surgery are also disclosed.

The invention provides an integrated NEMS cantilever sensor with a precisely controlled cantilever gap, having a receptor attached to bridge the gap. When the receptor interacts with the target analyte, it changes the conformation, thereby causing a change in the gap. A detector within the sensor generates a signal corresponding to a change in gap size to confirm interaction with the analyte.

Flexible, longitudinally extended sensors comprising variably inductive sensing material. Sensors connect to an external processing unit using as few as 2 connections. In operation, sensors measure inductance along their longitudinal extent (curve). Spectral de multiplexing allows electrical property differences along sensors to be resolved. This enables shape tracking of the flexible sensor. The sensor principles are suitable for the production of ultra-small diameter probes (for example, smaller than 0.5 mm) of arbitrary length (for example, 30 cm long). There are potential advantages for cost efficiency and ease of manufacture.

A probe (303; 403) for sensing a magnetic marker, comprising a first coil set (313; 413) including a first coil of a first coil type, e.g., a sense coil (305; 405), disposed between a first pair of coils of a second coil type, e.g., a drive coil (301a, 301b; 401a, 401b) connected in series, and a balance element (317; 417) axially spaced from the first coil set (313; 413) along the length of the probe (303; 403). The balance element (317; 417) is configured or arranged to generate a sense voltage that fully offsets, partially offsets, or minimizes a sense voltage induced in one or more sense coils (305; 405) of the first coil set from the drive coil or coils (301a, 301b; 401a, 401b). A detection system is also disclosed, comprising the probe (303; 403), a magnetic field generator configured to drive an alternating magnetic field through the drive coils (301a, 301b; 401a, 401b) of the first coil set and the balance element (317; 417), and at least one detector configured to receive a signal indicative of a sensed voltage.

Improved techniques for monitoring and managing individual fasteners and fastener driver conditions within varying materials, are provided. In some aspects of the application, fastener tightness is monitored by a control system, and remedial actions are taken when fastener tightness indicates the absence of a desired condition of the fastener or a material in which it is embedded. In other aspects, fastener seating is monitored by a control system, and remedial actions are taken when a change in fastener seating indicates damage or another adverse condition of the fastener or a material in which it is embedded.

A method for performing a field mapping of a cell under a load is provided. The method includes the following steps: providing a cell; providing a Hall effect sensor including a graphene conductor for measuring a magnetic field; positioning the Hall effect sensor at a first position adjacent to the surface of the cell; applying a load to the cell; and measuring the output of the Hall effect sensor.

The present invention relates to a sensor for measuring magnetic fields in extreme conditions, particularly at high ambient temperatures and under exposure to intense ionising radiation. The invented sensor consists of a sandwich structure of substrates (1) made of ceramic material. In the gaps between the substrates (1) in the sandwich structure, fired printed surface patterns (2, 3, 8) are formed on the substrates (1), which form the individual turns of the resulting measuring coil of the sandwich structure. The manufacturing process for the invented sensor is simple, as surface patterns are first printed onto individual substrates (1), which are then fired, and subsequently the substrates (1) are assembled into a sandwich structure, fixed by means of fixation points (5, 6), and the sandwich structure is then hardened by re-firing. Part of the invention is the structure of the fired patterns, which allows the sensor to achieve maximum separation of a useful signal in the sensing axis relative to other axes and to resist other physical effects caused by radiation.

To provide a device, a system, and a process for detecting an object indicating a possibility of danger of a launch object in a high magnetic field region, such as a potentially dangerous object made of iron that may move within a region of ferromagnetic attraction by a magnetic resonance imaging (MRI) scanner.SOLUTION: A system and a process can include a plurality of magnetic field sensors and a plurality of flight time type sensors arranged in a periphery of a passage. The flight time type sensors can facilitate determination of a motion (for example, speed and / or direction) of a potentially dangerous object made of iron to improve accuracy of threat detection.SELECTED DRAWING: Figure 11

The present application provides a kind of gradient magnetic field sensor, wherein: with: alternating current power connection terminal, it is connected with the 1st power terminal that alternating current power has;1st magnetic core, it is connected between the alternating current power connection terminal and ground wire;2nd magnetic core, it is connected in parallel with the 1st magnetic core between the alternating current power connection terminal and ground wire;Alternating current control unit, it is connected between the alternating current power connection terminal and at least one of the 1st magnetic core and the 2nd magnetic core, controls the alternating current that flows through at least one of the 1st magnetic core and the 2nd magnetic core;1st detection coil, it is wound in the 1st magnetic core;2nd detection coil, it is wound in the 2nd magnetic core, and is differentially connected with the 1st detection coil;And detection circuit, it detects the voltage corresponding to the difference between the 1st voltage output from the 1st detection coil and the 2nd voltage output from the 2nd detection coil.

A client device estimates an error in a heading component of a magnetometer measurement based on an error in a vertical component of the magnetometer measurement. The client device receives a three-dimensional measurement from a magnetometer including a heading and a vertical component. The client device identifies an expected vertical component based on a position of the client device and a magnetic map. The client device generates an error estimate based on the vertical component of the three-dimensional measurement and the expected vertical component. The client device compares the error to an error threshold and, in response to the error estimate being less than an error threshold, determines a pose of the client device based on the heading. The client device displays augmented reality content to the user using the pose.

An electromagnetic tracking system includes an adjustable source of electricity, a magneto-resistive (MR) sensor coupled to the adjustable source of electricity and configured to couple to a device for tracking a position of the device, and a controller coupled to the adjustable source of electricity and the MR sensor to adjust an amount of electricity provided to the MR sensor by the adjustable source of electricity. The electromagnetic tracking system is configured to track MR sensors and coil-based sensors simultaneously using one or more input channels on the controller.

The invention relates to the technical field of magnetic field measurement and plasma diagnosis, in particular to an anti-sputtering telescopic and deformable vacuum three-dimensional array magnetic field monitoring device and method. According to the technical scheme, the device comprises a power transmission device module, a rotating device module, a probe device module, a base and a signal transmission module, the power transmission device module is located in the base and is in nested connection with the rotating device module, the rotating device module is fixedly connected with the probe device module, and the signal transmission module is connected with the base; the power transmission device module is used for controlling the probe device module to move in the vertical or horizontal direction. According to the invention, the full-dimensional precise measurement of the three-dimensional magnetic field in the vacuum environment is realized, the measurement position and angle can be finely adjusted without moving the base, the measurement flexibility and the coverage range are greatly improved, good vacuum sealing performance and sputtering resistance are achieved, the operation is convenient, the positioning is precise, and the measurement efficiency and the data consistency are effectively improved.

A device for determining a flow-rate-dependent variable of a flowable and conductive medium in a guide body for guiding the medium includes a magnetic-field-generating device for generating a first magnetic field that separates mobile charge carriers in the medium and a magnetic-field-sensitive measuring arrangement for determining a second magnetic field that is generated by the mobile charge carriers. The magnetic-field-sensitive measuring arrangement includes a first magnetic-field-sensitive measuring device having a magnetic-field-sensitive and optically excitable material, an optical excitation unit for the optical excitation of the first magnetic-field-sensitive measuring device, and an optical detection unit for detecting a measurement signal that correlates with a change and / or a strength of the second magnetic field. An evaluation circuit is configured to determine the flow-rate-dependent variable, measurement signals of at least two different magnetic field states influencing the determination of the flow-rate-dependent variable.

A magnetic field detection sensor with: a magnetic impedance element designed to exploit a magnetic impedance effect; a bias coil designed to apply a bias field to the magnetic impedance element; an oscillator circuit designed to apply an alternating current to the magnetic impedance element; a differentiating circuit designed to differentiate an output signal of the magnetic impedance element; a flip-flop circuit configured to output a high-level signal and a low-level signal based on a trigger signal output by the differentiating circuit; and a computing unit configured to detect an external magnetic field based on a time course with high and low of the high-level signal and low-level signal output by the flip-flop circuit, wherein the magnetic field detection sensor is configured to detect the external magnetic field based on an output signal obtained by applying the alternating current to the magnetic impedance element, the magnetic impedance element comprises a non-magnetic substrate and a magnetic layer provided on a surface of the non-magnetic substrate, wherein a magnetic field detection direction coincides with a longitudinal direction of the magnetic impedance element and the magnetic layer is configured to have magnetic anisotropy such that a direction of an axis of its easy magnetizability coincides with the magnetic field detection direction, and The computing unit is configured to send a reset signal to the flip-flop circuit at the time of a drop in an AC bias frequency, and to detect the external magnetic field based on the duration of an initial high-level signal following the reset signal.

A device for protecting, controlling and monitoring an electrical medium range switching device, the device comprising the use of a Rogowski coil embedded within a bottle of the switching device, and the bottle surrounding the flow of voltage and current of a main power source, a capacitive or similar voltage divider also surrounding the main power source and extending around the bottle, an analog signal is provided from these devices to an integrated circuit for conversion into a digital signal, and then the digital signal is passed as an output to a digital collector in which the digital signal is optionally time-stamped and compared to other signals, standard values or own signals at different times.