9 results about "Gmr sensor" patented technology

The present invention relates to a nano- or microparticle comprising a matrix made of or comprising at least one polyvinyl alcohol (PVA), and ferrite dispersed therein, as well as a method for obtaining it. The present invention also relates to the use of these nano- or microparticles for the preparation and implementation of devices capable of being detected by giant magnetoresistance sensors (GMR sensors) as biological diagnostic tools.

Methods of, inter alia, detecting the presence of one or more analytes in one or more query samples include providing one or more sensor that each include biomolecules disposed on a functionalized surface of one or more giant magnetoresistance (GMR) sensors. Modes of operation remove or add magnetic beads from the vicinity of sensor surfaces by interactions with the biomolecules. The methods feature, inter alia, detecting the presence of one or more analytes in one or more query samples by measuring magnetoresistance change of the one or more GMR sensors based on determining magnetoresistance before and after passing magnetic particles over the one or more sensors.

An elevator car positioning system includes a plurality of magnetic field producers, each of the plurality of magnetic field producers located in a position corresponding to an entry / exit point of an elevator. A giant magnetoresistance (GMR) sensor is disposed on an elevator car of the elevator to detect individual ones of the plurality of magnetic field producers when within a given detection range of the GMR sensor and generate detection signals indicative thereof. A controller is in communication with the GMR sensor and is configured to receive the detection signals from the GMR sensor, determine a position of the elevator car relative to the entry / exit point based on the received detection signals, and generate control signals to position the elevator car.

Rotation detection device (1) comprising: a detected element (2) mounted on a rotating element (11) and having multiple magnetic poles arranged circumferentially around an axis of rotation (O) of the rotating element (11); and a sensor section (3) mounted on a stationary element (9) that does not rotate with the rotation of the rotating element (11) and is arranged so that it faces the detected element (2); wherein a retaining hole (90) for holding the sensor section (3), which penetrates the stationary element (9) in a radial direction to the axis of rotation (O), is formed in the stationary element (12), wherein the sensor section (3) is inserted into the retaining hole (90) in the radial direction to the axis of rotation (O), wherein the sensor section (3) comprises: several magnetic sensors (30), each comprising a plate-shaped detection section (300) comprising a magnetism detection element for detecting a magnetic field from the detected element (2), a signal processing circuit for processing a signal output by the magnetism detection element, and a cover that jointly covers the magnetism detection element and the signal processing circuit, wherein the sensor section (3) comprises a housing section (31) that jointly covers the multiple magnetic sensors (30), wherein the detection sections (300) are stacked in a direction parallel to the axis of rotation (O) in which the sensor section (3) and the detected element (2) face each other, and wherein the sensor section (3) comprises two magnetic sensors (30), wherein the magnetic sensor (30) located furthest from the detected element (2) has a higher sensitivity than the magnetic sensor (30) located closest to the detected element (2), and wherein the magnetic sensor (30) located on a side closer to the detected element (2) comprises a Hall IC and the magnetic sensor (30) located on the side opposite the detected element (2) comprises a GMR sensor, an AMR sensor or a TMR sensor.

The application discloses a kind of railway vehicle bogie bolt fast inspection device and quantitative evaluation method, belong to railway vehicle nondestructive testing technical field.The device includes array spontaneous leakage magnetic probe, spatial positioning mechanism and signal processing unit.Array spontaneous leakage magnetic probe uses high sensitivity GMR sensor array, picks up high intensity bolt self remanence generated spontaneous leakage magnetic signal, without additional magnetizing device;Space positioning mechanism synchronously records probe position coordinate;Signal processing unit extracts signal peak-peak value, waveform width and other characteristics, combined with CNN-LSTM multi-task deep learning model, output bolt's pre-tightening force retention rate, damage classification result and stress history index.The application does not need external magnetic field, operation is safe and convenient, single bogie detection time is shortened to within 5 minutes, realizes the non-contact, fast, quantitative evaluation of railway vehicle bolt in-service state, provides technical support for railway vehicle digital operation and maintenance.

This application relates to a method for enhancing giant magnetoresistive (GMR) sensor signals based on multi-channel fusion. The method includes: calibrating the complex domain frequency response of each GMR channel to obtain discrete complex sampled values ​​of differential-mode sensitivity and common-mode response transfer function at a preset frequency set; acquiring multiple original digital signal streams, and obtaining complex spectral data for each channel and frequency slot through framing and short-time frequency domain transformation; obtaining estimated values ​​of the common-mode transfer function of each channel relative to a reference channel through frame-by-frame adaptive blind identification; obtaining a compensated multi-channel time-domain signal sequence through frequency domain consistency compensation, inverse transformation, and time-domain reconstruction; and finally, outputting the enhanced GMR sensor signal through statistical optimal weighted fusion and sparse domain enhancement. This method can accurately suppress common-mode interference, align the frequency domain characteristics of multiple channels, and improve the signal-to-noise ratio and detection sensitivity of the GMR sensor signal.

The application belongs to the technical field of power system overvoltage protection, and particularly relates to a ferromagnetic resonance flexible device based on a power electronic converter, wherein a full-bridge uncontrolled rectification and a double-switch BUCK chopper circuit topology are adopted in the power electronic converter module, and a dynamic equivalent damping resistor is simulated through duty cycle adjustment of a MOSFET switch; a signal acquisition module integrates a GMR sensor, a T-shaped thermocouple and a voltage detection unit; a control module performs ferromagnetic resonance feature identification based on an FFT algorithm, combines critical conduction mode control and a model reference self-adaptive PI control algorithm, dynamically generates a PWM signal to drive the converter to work, and realizes rapid self-adaptive dissipation of resonance energy. Through multi-parameter fusion detection and a composite control strategy, the application effectively improves the response speed and the regulation accuracy of ferromagnetic resonance suppression, has state self-diagnosis, parameter visual configuration and remote data interaction functions, and significantly improves the operation reliability of a power system.

The invention discloses a fan-shaped magnetic flux large current measuring system and method, and the system comprises a closed circular ring which is formed by splicing a plurality of arc-shaped iron-based amorphous magnetic cores, and a certain air gap is formed between each magnetic core and an adjacent magnetic core; gMR sensors are arranged in air gaps of the inner ring of the circular ring, and the two ends of each GMR sensor are connected with the two adjacent arc-shaped iron-based amorphous magnetic cores respectively. Current detection is performed through the four-air-gap fan-shaped magnetic field magnetic ring structure formed by the four arc-shaped iron-based amorphous magnetic cores, so that the magnetic field gradient at the air gaps is minimum, an optimal site of the sensor is naturally formed, positioning dependence is eliminated, finite element simulation is omitted, magnetic field measurement is performed through the structure, and the deviation position of a current wire is calculated. The current measuring device has the advantages of being simple in design and production, high in measuring result consistency, large in current measuring range and simple in measurement, installation and implementation.

A tactile sensor device is disclosed. In one embodiment, giant magnetoresistance (GMR) sensors form multiple Wheatstone bridges on a base substrate to detect a magnetic field generated by a nearby ferromagnet. This ferromagnet is embedded within an elastomer matrix that deforms upon contact with an external object, displacing the ferromagnet. Consequently, the GMR sensors detect changes in the magnetic field resulting from the ferromagnet's displacement, thereby quantifying the contact.