355results about "Magnetic sensor arrays" patented technology

A Hall sensor array for offset-compensated magnetic field measurement comprises a first and at least one additional pair of Hall sensor elements. Each Hall sensor element has four terminals, of which two act as power supply terminals for supplying an operating current and two act as measurement terminals for measuring a Hall voltage. Respective first supply terminals of each Hall sensor element are connected together and to a first terminal of a common voltage source and respective second supply terminals of each Hall sensor element are connected together and to a second terminal of the common voltage source so that the common voltage source supplies an operating current for the Hall sensor elements. The Hall sensor elements are operated in the spinning current mode so that the offset voltages of the Hall sensor elements approximately cancel one another out in a revolution so that the Hall signal contributions which actually depend on the magnetic field remain.

High-accuracy magnetic measurement is performed by efficiently using nitrogen-vacancy pairs in all orientations. A magnetic measurement apparatus includes a diamond crystal and an image sensor. The diamond crystal has nitrogen-vacancy pairs. The image sensor detects the intensities of fluorescence generated by an exciting light applied to the diamond crystal by using a plurality of pixels. The nitrogen-vacancy pairs of the diamond crystal are made to one-to-one correspond to the pixels. The fluorescence generated by one nitrogen-vacancy pair is received by one pixel made to correspond to the nitrogen-vacancy pair.

A position-measuring device for fluidic cylinder-and-piston arrangements having at least one Hall sensor, preferably arranged in the area of the cylinder wall, especially in a cylinder wall, and a magnetic region, arranged in the piston. At least one Hall sensor array has at least two Hall sensors spaced one from the other in the direction of movement of the piston. One coil is provided whose magnetic field permits the switching points of the Hall sensors to be adjusted in response to the coil current.

A magnetic field measurement system includes an array of magnetometers; at least one magnetic field generator with each of the at least one magnetic field generator configured to generate a first magnetic field at one or more of the magnetometers, wherein the generated first magnetic field combines with the ambient magnetic field to produce a directional magnetic field at the one or more of the magnetometers, where a magnitude and direction of the directional magnetic field is selectable using the at least one magnetic field generator; and a controller coupled to the magnetometers and the at least one magnetic field generator, the controller including a processor configured for receiving signals from the magnetometers, observing or measuring a magnetic field from the received signals, and controlling the at least one magnetic field generator to generate the first magnetic field and select the direction of the directional magnetic field.

An apparatus including a controller, a workpiece transport in communication with the controller having a movable portion and a transport path, and a multi-dimensional position measurement device including at least one field generating platen attached to the movable portion and at least one sensor group positioned along the transport path and in communication with the controller, the field generating platen is configured for position measurement and propelling the movable portion, each sensor in the at least one sensor group is configured to provide but one output signal along a single axis corresponding to a sensed field generated by the at least one field generating platen and the controller is configured calculate a multi-dimensional position of the movable portion based on the but one output signal of at least one of the sensors in the at least one sensor group, the multi-dimensional position including a planar position and a gap measurement.

An array of optically pumped magnetometers includes a vapor cell arrangement having a wafer defining one or more cavities and alkali metal atoms disposed in the cavities to provide an alkali metal vapor; an array of light sources, each of the light sources arranged to illuminate a different portion of the one or more cavities of the vapor cell arrangement with light; at least one mirror arranged to reflect the light from the array of light sources after the light passes through the one or more cavities of the vapor cell arrangement; and an array of detectors to receive light reflected by the at least one mirror, wherein each of the detectors is arranged to receive light originating from one of the light sources.

One embodiment is a magnetic field measurement system that includes at least one magnetometer having a vapor cell, a light source to direct light through the vapor cell, and a detector to receive light directed through the vapor cell; at least one magnetic field generator disposed adjacent the vapor cell; and a feedback circuit coupled to the at least one magnetic field generator and the detector of the at least one magnetometer. The feedback circuit includes at least one feedback loop that includes a first low pass filter with a first cutoff frequency. The feedback circuit is configured to compensate for magnetic field variations having a frequency lower than the first cutoff frequency. The first low pass filter rejects magnetic field variations having a frequency higher than the first cutoff frequency and provides the rejected magnetic field variations for measurement as an output of the feedback circuit.

The wire rope detection method based on 3D leakage magnetic field comprises: acquiring the defect sample magnetic leakage signal by Hall sensor array; eliminating trough by an adaptive space trapping filter; taking normalization and K-L transformation to extract feature and train NN, and detecting the real defect by the network. The corresponding detection device comprises: a sensor probe included a permanent magnet excitation part and an analog switch and a photoelectric encoder, a data acquirement processor, and a computer. This invention can provide full defect signal and improve detection precision.

The present invention relates to a new method for characterizing magnets, magnetic assemblies (combinations of magnets) and magnetic materials. In what follows, these will be called under the common term ‘magnetic systems’. The method is based on obtaining quantitative properties of the magnetic system by combining magnetic field measurement data and theoretical modeling or simulation data. The input parameters of the theoretical model are optimized using an optimization method in order to obtain a best fit to the measured data. In this method, the present invention involves precalculating magnetic field distributions prior to the optimization execution in order to considerably speed up the process. Combining this advanced data processing with fast magnetic field mapping using e.g. a magnetic field camera, allows real-time measurement and data analysis of magnetic systems for applications in e.g. quality control of such magnetic systems.

A wireless array for providing access to a network is provided. The wireless array includes at least two transceivers in signal communication with a client. A magnetometer of the wireless array provides orientation information relating to an orientation of the wireless array relative to a magnetic field. A controller of the wireless array is in signal communication with the transceivers and the magnetometer. The controller manages the communications exchanged via the transceivers and receives the orientation information provided by the magnetometer.

A method for bonding together two substrates includes providing a molecular glue including glue molecules, each of the glue molecules having at least two —O—Si or —O—Al moieties; reacting a surface of a first substrate with the molecular glue to attach the glue molecules to the surface of the first substrate by at least one of the —O—Si or —O—Al moieties; and reacting a surface of a second substrate with the molecular glue to attach the glue molecules to the surface of the second substrate by at least another one of the —O—Si or —O—Al moieties. The method can be used for a variety of applications including manufacturing a vapor cell.

Certain inventive aspects provide local field imaging with high spatial, time and field resolution by using an array of Hall effect sensors that can be individually read out. The design combines semiconductor Hall sensors and switches that isolate the addressed Hall sensor from the rest of the array. The compact design allows for large and very dense Hall sensor arrays that can be read out in a straightforward way.

The invention discloses a linear motor motion control method based on fixed-step speed measurement. Equidistantly arranged Hall switch sensor arrays are used for conducting the position measurement and the speed measurement of the rotor of a linear motor and implementing back-and-forth motion control by stages. The control sequentially comprises a high-speed constant speed stage, a speed reduction stage, a low-speed constant speed stage and a boundary guidance stage. Position PID control, acceleration PID control, speed PID control and position PD control are respectively implemented in each of the four stages. Since the method is based on a simple measurement device and the motion control of the linear motor with variable load capacity can be realized, the invention has the advantages that no grating precise measurement mechanism is required, the problem that the millimeter-scale linear motor positioning control cannot be realized on the dependence of Hall switch sensors only in the prior art is solved, and the cost and the complexity of the system are reduced.

A method of making an array of vapor cells for an array of magnetometers includes providing a plurality of separate vapor cell elements, each vapor cell element including at least one vapor cell; arranging the vapor cell elements in an alignment jig to produce a selected arrangement of the vapor cells; attaching at least one alignment-maintaining film onto the vapor cell elements in the alignment jig; transferring the vapor cells elements and the at least one alignment-maintaining film from the alignment jig to a mold; injecting a bonding material into the mold and between the vapor cell elements to bond the vapor cell elements in the selected arrangement; removing the at least one alignment maintaining film from the vapor cell elements; and removing the bonded vapor cells elements in the selected arrangement from the mold to provide the array of vapor.

The invention discloses a touch detection method, a device and a system thereof, belonging to the touch detection technical field. The method includes: touch operation of a magnetic touch tool in a target area in which a hall sensor array is arranged is received; the operation mode of the magnetic touch tool is judged according to the position of the detected hall sensor, electromagnetism of which is changed, in the target area and the detection time, and the occurring position of the operation mode is determined. The device comprises a touch receiving module and a touch detecting module. The system comprises a touchpad and a magnetic touch tool which is used for touching the touchpad; wherein, the touchpad consists of a touch receiving module and a touch detecting module. The invention realizes the detection on touch by the hall sensor array and avoids the influence of man-induced factor caused by using touch tools such as fingers, and the like, and even the environment factor, thus improving the detection precision.

An array of optically pumped magnetometers includes an array of vapor cells; and an array of beam splitters. The array of beam splitters is arranged into columns, including a first column, and rows. Each row and each column includes at least two of the beam splitters. The array of beam splitters is configured to receive light into the first column of the array and to distribute that light from the first column into each of the rows and to distribute the light from each of the rows into a plurality of individual light beams directed toward the vapor cells.

A single bridge magnetic field sensor includes a fluxguide mounted to a surface of a substrate. A bridge unit includes first, second, third, and fourth magnetoresistive elements mounted around the fluxguide and mounted on the surface of the substrate. A switching circuit is electrically connected to two voltage inputs, two grounding terminals, two voltage output terminals, and the four magnetoresistive elements. The switching circuit can proceed with circuit switching according to a magnetic field in each axis direction to be measured, thereby changing electrical connection between the voltage inputs, the grounding terminals, the voltage output terminals, and the four magnetoresistive elements. A measuring unit is electrically connected to the two voltage output terminals and the four magnetoresistive elements. The magnetoresistances of the four magnetoresistive elements measured by the measuring unit and output voltages of the voltage output terminals can be used to obtain a magnetic field measurement result.

A sensor device having a first housing with a first semiconductor body and a plurality of metallic terminal contacts for electrical contacting of a first sensor, and a second housing with a second semiconductor body with a plurality of metallic terminal contacts for electrical contacting of a second sensor. A section of the plurality of terminal contacts penetrates the second housing on the face side and the second semiconductor body is arranged with a back surface on a front side of the second metal substrate. The two housings form a module, whereby the two housings are connected form-fittingly to one another in the shape of a stack by a fixing device in a way in which the bottom side of the first housing is joined to the bottom side of the second housing and the plurality of terminal contacts of the two housings point in the same direction.

An automatic recognition method includes the calculation of an error representative of the difference between an estimate of the values of the magnetometer measurements when the positions, orientations and amplitudes of the magnetic moments of the P dipoles are equal to those determined, and the values of the magnetometer measurements taken. There is the selection of another system of equations linking each measurement of a triaxial magnetometer to the position, orientation and amplitude of the magnetic moment of P′ magnetic dipoles. The method includes the calculation of at least one distinctive feature of the object presented from the position, orientation, or amplitude of the magnetic moment of each dipole determined with the system of equations that minimizes the error calculated. The method includes the recognition of the magnetic object presented if the calculated distinctive features correspond to those of a known object, otherwise the lack of recognition of this object.

The invention discloses a compensation circuit for sensitivity and zero temperature drift in a Hall sensor integrated chip. The compensation circuit comprises an Hall sensing element, an amplifier, anadder, a buffer, a gain adjustment module, a zero adjustment module, a temperature sensor, a stress sensor, an ADC (analog-to-digital converter), a control processing circuit, a first DAC, a second DAC, a factory temperature compensation coefficient memory, a factory stress compensation coefficient memory, a user gain correction value memory and a user zero offset correction value memory. Correspondingly, the invention also provides a compensation method of the compensation circuit for sensitivity and zero temperature drift in the Hall sensor integrated chip. According to the compensation circuit and the compensation method, the sensitivity and zero-point temperature drift compensation precision is greatly improved, the performance index of the sensor is improved, and requirements of customers for sensitivity and zero-point temperature compensation in the production or use process of the sensor are met; and the method not only realizes temperature compensation of the sensitivity, butalso realizes compensation of zero-point temperature drift, and can quickly respond to change of an external magnetic field.

A current sensor device for measuring a current of at least 30 Amps, comprising: a leadframe with a electrical conductor having a centerline; a substrate mounted to the electrical conductor and comprising a first and a second magnetic sensor configured for providing a first and second value; and a processing circuit for determining the current based on a difference or weighted difference between the first and second value. The first and second magnetic sensor are arranged asymmetrically with respect to the centerline.