52results about "Electrodynamic magnetometers" patented technology

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and according to the relevance between the comprehensive current reading without eccentric interference and historical reference current data, analyzing the stability of a current measurement state, and obtaining a real-time clamp operation state feedback record.

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 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.

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.

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.

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.

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.

Methods and apparatus for a sensor having noise filtering using cascaded filters. A detection module can detect noise above a threshold level and a control module coupled to the detection module can output a control signal based on whether the detection module detects the noise above the threshold level. A filter module includes a first filter and a second filter cascaded with the first filter. The first filter has reconstruction mode to output a signal based on the input prior to detection of the noise above the threshold level. The second filter filters an output of the first filter to smooth the output of the first filter.

Magnetic field detection device and magnetic field measurement system comprising such a device This description relates to a magnetic field (Bz) measurement system (10) comprising a magnetic field detection device (20) comprising a tapered acoustic waveguide (40), an electrically conductive wire (50) rigidly coupled to a tapered end of the guide and an electroacoustic transducer (60) rigidly coupled to the base of the guide;and a control and acquisition device (30) connected to the magnetic field detection device comprising a generator (33I) supplying a pair of opposite-direction current pulses or a plurality of frequency-modulated current pulses in the conducting wire and an acquisition circuit (32) detecting electrical signals (S) supplied by the electroacoustic transducer or a generator supplying a pair of opposite-signal voltage pulses or a plurality of frequency-modulated voltage pulses controlling the electroacoustic transducer and an acquisition circuit detecting electrical signals supplied by the conducting wire. Figure for the abstract: Fig. 7;

The three-dimensional on-chip magnetic sensor includes first, second, and third coils. The first and second coils each include a planar spiral formed by a metal layer and metal vias. Each planar spiral of the first coil includes a plurality of interconnected first loops wound around a first axis, with adjacent first planar spirals electrically connected to each other. Each planar spiral of the second coil includes a plurality of interconnected second loops wound around a second axis, with adjacent second planar spirals electrically connected to each other. The third coil has a planar spiral including a plurality of interconnected third loops wound around a third axis. Each conductive coil is configured to generate a respective electromagnetic force (EMF) induced by an oscillating magnetic field, and each EMF drives a respective alternating current (AC) through a respective readout circuit. Each readout circuit is configured to detect the magnitude of a respective peak voltage of each AC.

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 directed emitter / sensor for electromagnetic tracking in suitable augmented reality systems.SOLUTION: An electromagnetic tracking system includes a hand held controller including an electromagnetic emitter configured to generate an electromagnetic field characterized by an electromagnetic field pattern and a first electromagnetic reflector positioned adjacent the electromagnetic emitter and configured to form a modified electromagnetic field pattern. The electromagnetic tracking system also includes a head mounted augmented reality display including an electromagnetic sensor configured to sense the electromagnetic field and a second electromagnetic reflector adjacent to sensor configured to optimally sense electromagnetic field pattern in a region of interest.SELECTED DRAWING: Figure 6

Influence of RF noise and external magnetic field on the image quality of a portable magnetic resonance imaging (MRI) system (1) are to be avoided. This is achieved by providing a system and a computer-implemented method for determining an optimized position and / or orientation of a portable MRI system (1) for an MR imaging process in a medical environment (2), comprising at least one RF noise sensor (3), wherein the RF noise sensor (3) is configured for measuring RF noise in the medical environment (2) and to provide sensor data, at least one magnetic field sensor (4), wherein the magnetic field sensor (4) is configured to measure the external magnetic field in the medical environment (2) and to provide sensor data, a processor unit (5), wherein the sensors (3, 4) are connected to the processor unit (5), the processor unit (5) comprising at least one memory (6) for storing instructions, at least one processor (7) configured to execute the instructions to cause the following to be performed: measuring RF noise and the external magnetic field in the medical environment by means of corresponding sensors (3, 4), evaluating the sensor data and creating spatial distributions of the measured RF noise and / or the measured external magnetic field in the medical environment (2), determining a position and / or orientation of the portable MRI system (1) in the medical environment (2) for an MR imaging process based on the spatial distributions of the measured RF noise and / or the measured external magnetic field.

This invention discloses a magnetic induction intensity measuring device, comprising a base plate, with support frames mounted at both the front and rear ends of the base, a rotating shaft mounted on the support frames and rotatably connected to the support frames, a coil fixedly mounted on the base plate to the right of the rotating shaft, the rotating shaft passing through the axis of the left side frame of the coil, and the coil being fixed to the rotating shaft by a fixing device, a pressure sensor and a pressure digital display screen fixedly mounted on the base plate; a pressure sensor is mounted on the base plate below the right side frame of the coil, and a pressure digital display screen is mounted on the right side above the base plate, the pressure sensor and the pressure digital display screen being connected via a data cable, and a magnet is mounted above the base. Using this magnetic induction intensity measuring device, the influence of the Ampere force generated in the opposite direction by the wire on one side of the coil on the Ampere force generated by the wire on the other side of the coil when calculating the magnetic induction intensity B can be eliminated, thus improving the accuracy of magnetic induction intensity measurement.

The present description concerns a system (10) for measuring a magnetic field (Bz) comprising a magnetic field detection device (20) comprising a tapered acoustic waveguide (40), an electrically-conductive wire (50) rigidly coupled to a tapered end of the guide, and an electroacoustic transducer (60) rigidly coupled to the base of the guide; and a control and acquisition device (30) coupled to the magnetic field detection device comprising a generator (33I) supplying a pair of current pulses of opposite directions or a plurality of frequency-modulated current pulses to the conductive wire and an acquisition circuit (32) detecting electrical signals (S) supplied by the electroacoustic transducer or a generator supplying a pair of voltage pulses of opposite signs or a plurality of frequency-modulated voltage pulses controlling the electroacoustic transducer and an acquisition circuit detecting electrical

A method for charging an electronic device and a wireless charger having a set of transmitter coils and a plurality of magnetic field sensors are disclosed. The method may comprise measuring magnetic fields in a predetermined charging region, detecting a change in the magnetic fields, and selecting the subset of the transmitter coils associated with the one of the magnetic field sensors. The method may further comprise energising each transmitter coil in the subset of the transmitter coils to transmit a predetermined maximum power output, selecting one transmitter coil from the subset of the transmitter coils, determining a first power output of said one transmitter coil, and energising said one transmitter coil to transmit at the first power output.

an on-chip electrical coil comprising: a semiconductor substrate; a plurality of metal layers disposed on the semiconductor substrate; a plurality of insulating layers disposed on the semiconductor substrate; a plurality of metal vias defined in the insulating layers; and a plurality of planar spirals formed by the metal layers and the metal vias, wherein each insulating layer is disposed between an adjacent pair of metal layers to form an alternating arrangement of metal layers and insulating layers, and each metal via electrically connects each adjacent pair of metal layers; the planar spirals include a plurality of interconnected loops, each loop including two metal wires, an intra-loop column, and an inter-loop column, wherein the two metal wires are disposed within respective metal layers, the intra-loop column electrically connects the two metal wires of each loop to each other, and the inter-loop column electrically connects one of the metal wires of each loop to one of the metal wires of a loop subsequent to the loop.

The invention relates to a sensor element for three-dimensionally detecting a magnetic field by means of a magnetoresistive sensor element. To this end, a sensor device is proposed in which at least one assembly having four magnetoresistive sensor elements in the form of a Wheatstone bridge can be deflected by means of a microelectromechanical structure in order to apply a mechanical force to the sensor elements.

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.

Improved techniques for customizing fastener tightness by 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 a change in fastener tightness indicates damage or another adverse 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. In some additional aspects, an actuator is located on board a fastener, and remedial actions are applied at the fastener, which may be in a remote location from the control system.

The present description relates to a system (10) for measuring a magnetic field (Bz) comprising a magnetic field detection device (20) comprising a tapered acoustic waveguide (40), an electrically conductive wire (50) rigidly coupled to a tapered end of the guide and an electroacoustic transducer (60) rigidly coupled to the base of the guide;and a control and acquisition device (30) connected to the magnetic field detection device comprising a generator (331) supplying a pair of opposite-direction current pulses or a plurality of frequency-modulated current pulses in the conducting wire and an acquisition circuit (32) detecting electrical signals (S) supplied by the electroacoustic transducer or a generator supplying a pair of opposite-signal voltage pulses or a plurality of frequency-modulated voltage pulses controlling the electroacoustic transducer and an acquisition circuit detecting electrical signals supplied by the conducting wire.;

A magnetic response distribution visualization device (100) includes an induction circuit (112) that induces a magnetic field component from outside of a moving object, a sensor (113) that senses an intensity and a phase of the magnetic field at a plurality of time points outside of the moving object, and an information processing circuit (124) that calculates an intensity and a phase of the magnetic field at a nearby position closer to the moving object than the sensor (113) based on a sensing result of the intensity and the phase of the magnetic field, a moving speed of the moving object, and a basic equation of the magnetic field, generates a magnetic response distribution image based on a calculation result of the intensity and the phase of the magnetic field, the magnetic response distribution image being an image that represents a distribution of a response of the moving object to the magnetic field component induced by the induction circuit (112) and being an image for security inspection.