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440results about "Magnetic field offset compensation" patented technology
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Auto-calibration of magnetic sensor
ActiveUS20080238410A1Magnetic field offset compensationMagnetic field measurement using galvano-magnetic devicesAtomic physicsAuto calibration
The present invention provides a method to compensate for the sensitivity drift of a magnetic field sensor for sensing a magnetic field. The magnetic field sensor comprises at least four electrodes. The method comprises a first step where a first set of two electrodes is used to bias the sensor and a second set of two electrodes is used to sense an output signal of the magnetic field sensor, and a second step where the second set of two electrodes is used to bias the sensor and the first set of two electrodes is used to sense an output signal of the magnetic field sensor. The method is characterized in that at least one of the first or the second step is subdivided in at least a first sub-step and a second sub-step. A reference magnetic field has first magnetic field parameters, e.g. a first amplitude and / or direction, in the first sub-step and second magnetic field parameters, a second amplitude and / or direction, in the second sub-step. An output signal is sensed in the first and in the second step, and within the first or the second step an output signal is sensed in the first and the second sub-step.
Owner:AMI SEMICON BELGIUM
Device for high-resolution measurement of magnetic fields
InactiveUS6690162B1Superconductors/hyperconductorsMagnetic field offset compensationFrequency spectrumVoltage drop
A device is proposed for high-resolution measurement, in particular for high-resolution absolute measurement of magnetic fields, having a network (1) of transitions (3) between superconductors (5, 6) which exhibit Josephson effects, called junctions below, the network comprising closed meshes (7, 8, 9, 10, 11, 12, 13), denoted by cells below, which in each case have junctions (3), which junctions are connected in a superconducting fashion, and at least three of these cells being connected in a superconducting and / or nonsuperconducting fashion. The object of the invention consists in further developing this device in such a way that it is possible to make absolute measurements of magnetic fields in a highly sensitive fashion. This object is achieved by virtue of the fact that the junctions (3) of the at least three cells (7, 8, 9) can be energized in such a way that a time-variant voltage drops in each case across at least two junctions of a cell, the time average of which voltage does not vanish, and in that the at least three cells are configured differently geometrically in such a way that the magnetic fluxes enclosed by the cells in the case of an existing magnetic field differ from one another in such a way that the frequency spectrum of the voltage response function has no significant Phi0-periodic component with reference to the magnetic flux.
Owner:QEST QUANTENELEKTRONISCHE SYST
Calibratable Multidimensional Magnetic Point Sensor
ActiveUS20110031960A1Improvement effortsExtension of timeTesting/calibration apparatusMagnetic field offset compensationElectrical currentAtomic physics
A calibratable magnetic field sensor for sensing a first and a second spatial component of a magnetic field in a reference point, wherein the magnetic field includes a first and a second measurement field component and / or a first and a second calibration field component. The magnetic filed sensor includes a first sensor element arrangement including at least a first and a second sensor element for sensing the first magnetic field component, which includes a first measurement field component and / or a first calibration field component, with respect to a first spatial axis in the reference point. Furthermore, the magnetic field sensor includes a second sensor element arrangement for sensing the second magnetic field component, which includes a second measurement field component and / or a second calibration field component, with respect to a second spatial axis in the reference point. The magnetic filed sensor also includes an excitation line arranged with respect to the first sensor element arrangement so that, when impressing a default current into the excitation line, a pair of different asymmetrical default calibration field components in the first sensor element and in the second sensor element is generated with respect to the first spatial axis in the first sensor element arrangement, wherein the two spatial axes pass along linearly independent position vectors.
Owner:FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
Method of auto calibrating a magnetic field sensor for drift and structure therefor
ActiveUS8134358B2Magnetic field offset compensationMagnetic field measurement using galvano-magnetic devicesAtomic physicsMagnetic field
The present invention provides a method to compensate for the sensitivity drift of a magnetic field sensor for sensing a magnetic field. The magnetic field sensor comprises at least four electrodes. The method comprises a first step where a first set of two electrodes is used to bias the sensor and a second set of two electrodes is used to sense an output signal of the magnetic field sensor, and a second step where the second set of two electrodes is used to bias the sensor and the first set of two electrodes is used to sense an output signal of the magnetic field sensor. The method is characterized in that at least one of the first or the second step is subdivided in at least a first sub-step and a second sub-step. A reference magnetic field has first magnetic field parameters, e.g. a first amplitude and / or direction, in the first sub-step and second magnetic field parameters, a second amplitude and / or direction, in the second sub-step. An output signal is sensed in the first and in the second step, and within the first or the second step an output signal is sensed in the first and the second sub-step.
Owner:AMI SEMICON BELGIUM
Magnetic 3D Sensor Calibratable During Measurement Operation
ActiveUS20120016614A1Component can be removedSimple and uncomplicated test optionMagnetic field offset compensationElectrical measurements3d sensorAcoustics
A magnetic field sensor for detecting first, second, and third spatial components of a magnetic field at a reference point includes a first sensor element arrangement for detecting the first magnetic field component having a first measurement field component and a first calibration field component with respect to a first spatial axis at a reference point, a second sensor element arrangement for detecting the second magnetic field component having a second measurement field component and a second calibration field component with respect to a second spatial axis y at the reference point and a third sensor element arrangement for detecting the third magnetic field component having a third measurement field component and a third calibration field component with respect to a third spatial axis x at the reference point. An excitation line is arranged such with respect to the three sensor element arrangements that when impressing a predetermined current into the excitation line respective predetermined calibration field components with respect to the spatial axes in the sensor element arrangements are generated.
Owner:FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
Magnetic field shaping components for magnetic field measurement systems and methods for making and using
ActiveUS20200057115A1High materialIncrease surface areaMagnetic field offset compensationMagnetic sensor packagingMagnetic fluxCondensed matter physics
A magnetic field measurement system includes at least one magnetometer; and at least one flux concentrator made of a high magnetic permeability material and configured to receive magnetic field signals from a source, to concentrate the magnetic field signals or reorient the magnetic field signals in a preselected direction, and to direct the concentrated or reoriented magnetic field signals toward at least one of the at least one magnetometer. In addition to, or as an alternative to, the flux concentrator, the system can include a passive shield made of the high magnetic permeability material. The system may also include active shielding.
Owner:HI LLC
Magnetic field measurement systems and methods of making and using
InactiveUS20190391213A1Magnetic field offset compensationMagnetic field measurement using flux-gate principleMagnetic tension forceCondensed matter physics
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.
Owner:HI LLC
Magnetic field measurement system and method of using variable dynamic range optical magnetometers
ActiveUS20200025844A1Improve dynamic rangeReduce in quantityMagnetic field offset compensationMagnetic sensor arraysEngineeringComputational physics
A magnetic field measurement system includes an array of magnetometers; at least one magnetic field generator configured to generate a compensation field across the array of magnetometers; and a controller coupled to the magnetometers and the at least one magnetic field generator and configured for adjusting a dynamic range and sensitivity of the array by adjusting a spatial variation of the compensation field to alter which of the magnetometers of the array operate in a measurement mode. Another magnetic field measurement system utilizes at least one magnetometer instead of the array. The controller is configured for adjusting a dynamic range and sensitivity of the array by adjusting a spatial variation of the compensation field to alter which of multiple domains within the at least one magnetometer operate in the measurement mode
Owner:HI LLC
Systems and methods for suppression of interferences in magnetoencephalography (MEG) and other magnetometer measurements
InactiveUS20200334559A1Magnetic field offset compensationDiagnostic recording/measuringMagnetoencephalographyComputational physics
A magnetic field measurement system, non-transitory computer-readable medium or method can include instructions for, or performance of, actions including receiving output of multiple first magnetic field sensors and multiple second magnetic field sensors; and demixing, using the output of the first and second magnetic field sensors, at least one signal from at least one target source from signals from other magnetic field sources. The demixing may be performed using a model in which the output of the first magnetic field sensors includes the at least one signal from the at least one target source and that the output of the second magnetic field sensors does not include the at least one signal from the at least one target source.
Owner:HI LLC
Methods and systems for fast field zeroing for magnetoencephalography (MEG)
PendingUS20210063510A1Easy to operateMagnetic field offset compensationAnalysis using optical pumpingLight beamParticle physics
A method of operating an optically pumped magnetometer (OPM) includes directing a light beam through a vapor cell of the OPM including a vapor of atoms; applying RF excitation to cause spins of the atoms to precess; measuring a frequency of the precession; for each of a plurality of different axes relative to the vapor cell, directing a light beam through the vapor cell, applying a magnetic field through the vapor cell along the axis, applying RF excitation to cause spins of the atoms to precess, and measuring a frequency of the precession in the applied magnetic field; determining magnitude and components of an ambient background magnetic field along the axes using the measured frequencies; and applying a magnetic field based on the components around the vapor cell to counteract the ambient background magnetic field to facilitate operation of the OPM in a spin exchange relaxation free (SERF) mode.
Owner:HI LLC
Single chip difference free layer push-pull type magnetic field sensor electric bridge and preparation method thereof
ActiveCN104280700AMagnetic field offset compensationManufacture of electrical instrumentsElectricityElectrical resistance and conductance
Owner:MULTIDIMENSION TECH CO LTD
Calibratable multidimensional magnetic point sensor
ActiveUS8203329B2Extension of timeTesting/calibration apparatusMagnetic field offset compensationPower flowAtomic physics
A calibratable magnetic field sensor for sensing a first and a second spatial component of a magnetic field in a reference point, wherein the magnetic field includes a first and a second measurement field component and / or a first and a second calibration field component. The magnetic filed sensor includes a first sensor element arrangement including at least a first and a second sensor element for sensing the first magnetic field component, which includes a first measurement field component and / or a first calibration field component, with respect to a first spatial axis in the reference point. Furthermore, the magnetic field sensor includes a second sensor element arrangement for sensing the second magnetic field component, which includes a second measurement field component and / or a second calibration field component, with respect to a second spatial axis in the reference point. The magnetic filed sensor also includes an excitation line arranged with respect to the first sensor element arrangement so that, when impressing a default current into the excitation line, a pair of different asymmetrical default calibration field components in the first sensor element and in the second sensor element is generated with respect to the first spatial axis in the first sensor element arrangement, wherein the two spatial axes pass along linearly independent position vectors.
Owner:FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
Dual-Path Analog to Digital Converter
ActiveUS20160139229A1Analogue/digital conversionElectric signal transmission systemsAnalog-to-digital converterMulti path
Methods and apparatus for processing a signal comprise at least one circuit configured to generate a measured signal during a measured time period and a reference signal during a reference time period. Also included is at least one dual- or multi-path analog-to-digital converter comprising at least a first processing circuit configured to process the measured signal, at least a second processing circuit configured to process the reference signal, and a third processing circuit configured to process both the measured signal and the reference signal.
Owner:ALLEGRO MICROSYSTEMS INC
Reading circuit for a magnetic field sensor with sensitivity calibration, and related reading method
ActiveUS20120153936A1Magnetic field offset compensationMagnetic field measurement using galvano-magnetic devicesElectricityMagnetic field
A reading circuit for a magnetic-field sensor, generating an electrical detection quantity as a function of a detected magnetic field and of a detection sensitivity, is provided with an amplification stage, which is coupled to the magnetic-field sensor and generates an output signal as a function of the electrical detection quantity and of an amplification gain. In particular, the amplification gain is electronically selectable, and the reading circuit is moreover provided with a calibration stage, integrated with the amplification stage and configured so as to vary a value of the amplification gain in such a way as to compensate a variation of the detection sensitivity with respect to a nominal sensitivity value.
Owner:STMICROELECTRONICS SRL
Magnetic field detector having a variable threshold
ActiveUS20100231202A1Undesirable output signalCondition may changeMagnetic field offset compensationMagnetic-field-controlled resistorsRotation velocityPeak detection
Apparatus for detecting a passing magnetic article includes a peak detector providing a detector output signal that changes state when the magnetic field signal differs from a magnetic field tracking signal by more than a threshold offset amount. The threshold offset amount is dynamically variable in response to detection of a speed of rotation of the magnetic article and a peak-to-peak signal level of the magnetic field signal.
Owner:ALLEGRO MICROSYSTEMS INC
Autonomously calibrated magnetic field sensor
ActiveCN103140770AEasy to implementMagnetic field offset compensationElectrical measurementsSignal processing circuitsReference current
The invention discloses an autonomously calibrated magnetic field sensor. The magnetic field sensor including a magnetic field sensing circuit (2) comprising a reference magnetic field generator (8) and a magnetic field sensing cell (6), and a signal processing circuit (4) connected to the output of the magnetic field sensing cell and comprising a demodulator circuit and a gain correction feedback circuit (30, 28, 47) for correcting error fluctuations in the transfer characteristic of the magnetic field sensor. The sensor further comprises a reference current generator (3)configured to generate a reference current I ref, the reference current generator connected to the magnetic field sensing circuit (2) configured for generating the reference magnetic field B ref and to the gain correction feedback circuit configured for providing a reference signal (y ref ) to which an output signal of the demodulator circuit may be compared.
Owner:莱姆电子(中国)有限公司
Optical fiber current transformer based on diamond NV color center and measuring method
ActiveCN113804941ASimple structureLow costCurrent measurements onlyVoltage/current isolationColour centreCurrent sensor
The invention relates to the technical field of current sensors, and provides an optical fiber current transformer based on a diamond NV color center and a measuring method. The optical fiber current transformer comprises laser excitation and reflected light receiving analysis equipment, a diamond NV color center probe, a magnetic concentrator and microwave excitation equipment, wherein the transformer adopts three measurement methods, namely an all-optical measurement method, a non-all-optical measurement method and a combined measurement method. The optical fiber current transformer is simple in structure, high in practicability, capable of resisting external interference and high in robustness, the optical fiber is only used for transmission of exciting light and collection of fluorescent light, thus bending and twisting of the optical fiber do not affect a detection result to a certain extent, and the use is more convenient; in addition, by optimizing the NV color center concentration and the spinning property in the diamond, the sensitivity of magnetic field measurement can be remarkably improved, and the possibility is provided for current measurement with higher precision.
Owner:ANHUI GUOSHENG QUANTUM TECH CO LTD
Magnetic shielded package
ActiveUS20160091575A1Improve sensor sensitivityReduce impactMagnetic field offset compensationSolid-state devicesEngineeringMagnetic shield
A magnetic shielded package includes a magnetic device, a first magnetic shield member, and a second magnetic shield member. The first magnetic shield member is disposed below the magnetic device. The second magnetic shield member is disposed on the first magnetic shield member so as to cover the magnetic device. An opening portion is formed in the first magnetic shield member (i) at such a position as not to be adjacent to an outer circumference of the first magnetic shield member or (ii) an upper wall of the second magnetic shield member.
Owner:KK TOSHIBA
Method for measuring current in an electric network
ActiveUS20130229173A1Inhibition effectMagnetic field offset compensationElectrodynamic magnetometersElectric lightSemiconductor chip
A method for measuring current in an electric network comprising at least one first electric line. The method includes fitting the first line with a circuit breaker having a protection coil and having a wall traversed by a magnetic field emitted by the protection coil; arranging on the wall of the circuit breaker a synchronous three-axis digital magnetometer on a semiconductor chip; by way of the digital magnetometer, measuring at least one component of a magnetic field emitted by the coil; and determining the value of a current traversing the electric line from the measured component.
Owner:SMARTFUTURE
Inductively interrogated passive sensor apparatus
ActiveUS20130147470A1Effectively nulls out the eddy current-generated magnetic fieldMagnetic field offset compensationMagnetic property measurementsElectricityMagnetic transducers
A sensor apparatus comprises a first magnetic transducer which in use is positioned on a first side of a barrier and a second magnetic transducer which in use is positioned on a second side of the barrier opposite the first side. The second transducer comprises a magnetic or electrical property which is dependent upon a sensible condition on the second side of the barrier, such as the pressure or temperature on the second side of the barrier. In operation, the first transducer generates a first magnetic field which induces the second transducer to generate a second magnetic field that is dependent upon the magnetic or electrical property of the second transducer. The first transducer detects the second magnetic field and generates a signal which is representative of the sensible condition on the second side of the barrier.
Owner:FMC TECH INC
Magnetic sensor with low electric offset
InactiveCN102954808AMagnetic field offset compensationConverting sensor output electrically/magneticallyEngineeringLow offset
The invention discloses a magnetic sensor device with low electric offset and high sensitivity, a method thereof, and a magnetic sensing system. The magnetic sensing system includes: a magnetic component proximate a movable mechanical component; and a magnetic sensor configured to determine a movement of the mechanical component based on a magnetic field produced by the magnetic component. The magnetic sensor includes: a low-offset magnetic sensing element; a high-sensitivity magnetic sensing element; and an offset compensation circuit configured to: determine a zero-crossing of a sensing field from an output of the low-offset magnetic sensing element; sample an offset value of the high-sensitivity magnetic sensing element at the zero-crossing; and subtract the offset value from an output of the high-sensitivity magnetic sensing element.
Owner:NXP BV
Detachable arrangement for on-scalp magnetoencephalography (MEG) calibration
ActiveUS20210011094A1Magnetic field offset compensationInertial sensorsNuclear magnetic resonanceEngineering
A calibration arrangement of a magnetic field measurement device includes at least one attachment point nub configured for attachment to the magnetic field measurement device; mounting arms extending from the at least one attachment point nub; and reference coil loops distributed among the mounting arms. A magnetic field measurement system includes the calibration arrangement and a magnetic field measurement device including a sensor mounting body, magnetic field sensors disposed on or within the sensor mounting body, and at least one primary attachment point formed in or on the sensor mounting body configured to receive the at least one attachment point nub of the calibration arrangement.
Owner:HI LLC
Systems and methods including multi-mode operation of optically pumped magnetometer(s)
ActiveUS10627460B2Magnetic field offset compensationDiagnostic recording/measuringVector modeMaterials science
Owner:HI LLC
Magnetic field sensing device
InactiveUS20130320972A1Reduce chip sizeSmall sizeNanomagnetismMagnetic field offset compensationElectricityElectrical conductor
The present invention relates to a magnetic field sensing device (50) comprising several functionally different layers (38, 60, 70), wherein a Wheatstone bridge layer (70) comprises at least two resistors (20) of a Wheatstone bridge (18), each resistor (20) comprises at least one magnetic field sensing element (10) in the form of a resistor subelement (22), and a flip conductor layer (38) comprising at least one flip conductor (30) for flipping the internal magnetization state of each magnetic field sensing element (10). The flip conductor (30) comprises a plurality of conductor stripes (32) being arranged on at least two different flip conductor sublayers (38-1, 38-2) of said flip conductor layer (38) and being electrically coupled with each other through vias.The multilayer arrangement of said flip conductor (30) provides a compact design of said magnetic field sensing device (50), such that a decreased power consumption, decreased inductance and improved sensitivity of the magnetic field sensing device can be achieved.
Owner:SENSITEC
Calibratable magnetic field sensor and method of producing same
ActiveUS9116192B2Clearly reduced influence on a calibration processLittle dependenceMagnetic field offset compensationMagnetic field measurement using galvano-magnetic devicesElectrical conductorMagnetic flux
Magnetic field sensor having a vertical Hall sensor element arranged in a semiconductor substrate, and an exciting conductor arrangement having at least one exciting conductor, the exciting conductor being arranged within an exciting conductor plane which is spaced apart, in parallel to the substrate surface, from the vertical Hall sensor element at a vertical distance h1 having a tolerance range Δh1 which is due to the manufacturing process, and which exciting conductor further has a lateral distance d1 as an offset from a center position which is located, in relation to the substrate surface, perpendicularly to the vertical Hall sensor element, and the lateral distance d1 being dimensioned such that a vertical calibration component B1x of a magnetic flux density B1 created by the exciting conductor arrangement in the vertical Hall sensor element changes by less than 5% within the tolerance range Δh1 for the vertical distance h1.
Owner:FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
Azimuth measurement device and azimuth measurement method
ActiveUS20070033818A1Improve calculation accuracyOffset informationMagnetic field offset compensationNavigation by terrestrial meansMeasurement deviceAnalog signal
There are provided an azimuth measurement device and its method for realizing an update of an offset calculated from the data acquired by azimuth measurement. A geomagnetism output measured by a 3-axis magnetic sensor is amplified and input to an A / D conversion section. A chopper section is arranged for switching the terminals for driving an X-axis, Y-axis and a Z-axis magnetic sensor and applies drive voltage output from a drive power source section to the X-axis, the Y-axis and the Z-axis magnetic sensor. The output amplified value amplified by the amplification section is converted from an analog signal to a digital signal by the A / D conversion section and then is input to a sensitivity / offset correction calculation section. Output data from this sensitivity / offset correction calculation section is input to an azimuth calculation section and the corresponding azimuth information is output. A reliability information calculation section outputs reliability information.
Owner:ASAHI KASEI ELECTRONICS CO LTD
Circuits and Methods for Removing a Gain Offset in a Magnetic Field Sensor
ActiveUS20170030979A1Reduce and eliminate effectMagnetic field offset compensationRelative phaseAcoustics
A magnetic field sensor and a method include a modulator coupled in a feedback arrangement and operable to modulate a calibration feedback signal with a modulator clock signal having a selected frequency and a selected relative phase operable to remove a gain error in the magnetic field sensor and in the method.
Owner:ALLEGRO MICROSYSTEMS INC
Integrated multilayer magnetoresistive sensor and manufacturing method thereof
ActiveUS20140015525A1Magnetic field offset compensationSingle device manufacturingField lineMagnetization
A magnetic-field sensor includes: a chip including a substrate having a first surface and an insulating layer covering the first surface; first and second magnetoresistors each extending into the insulating layer and having a main axis of magnetization and a secondary axis of magnetization; a first magnetic-field generator configured to generate a first magnetic field having field lines along the main axis of magnetization of the first magnetoresistor; a second magnetic-field generator configured to generate a second magnetic field having field lines along the main axis of magnetization of the second magnetoresistor. The main axes of magnetization extending transversely to each other and the secondary axes of magnetization extending transversely to each other. The first and second magnetoresistors extend into the insulating layer at a first distance and a second distance, respectively, that differ from one another, from the first surface.
Owner:STMICROELECTRONICS SRL
Azimuth measurement device and azimuth measurement method
ActiveUS7340362B2Offset informationImprove calculation accuracyInstruments for road network navigationMagnetic field offset compensationMeasurement deviceAnalog signal
There are provided an azimuth measurement device and its method for realizing an update of an offset calculated from the data acquired by azimuth measurement. A geomagnetism output measured by a 3-axis magnetic sensor is amplified and input to an A / D conversion section. A chopper section is arranged for switching the terminals for driving an X-axis, Y-axis and a Z-axis magnetic sensor and applies drive voltage output from a drive power source section to the X-axis, the Y-axis and the Z-axis magnetic sensor. The output amplified value amplified by the amplification section is converted from an analog signal to a digital signal by the ND conversion section and then is input to a sensitivity / offset correction calculation section. Output data from this sensitivity / offset correction calculation section is input to an azimuth calculation section and the corresponding azimuth information is output. A reliability information calculation section outputs reliability information.
Owner:ASAHI KASEI ELECTRONICS CO LTD
Efficient testing of magnetometer sensor assemblies
InactiveUS20170090003A1Efficient testingMagnetic field offset compensationElectrical measurementsEngineeringTest station
Systems, methods, and computer-readable media for efficiently testing sensor assemblies are provided. A test station may be operative to test a three-axis magnetometer sensor assembly by holding the assembly at each one of three test orientations with respect to an electromagnet axis. At each particular test orientation for each particular sensor axis, a difference may be determined between any magnetic field sensed by that sensor axis during the application of a first magnetic field along the electromagnet axis and any magnetic field sensed by that sensor axis during the application of a second magnetic field along the electromagnet axis. Those determined differences may be leveraged with the magnitudes of the first and second magnetic fields and the vector component of the electromagnet axis on each one of the sensor axes at each one of the test orientations to determine the sensitivity performances for each one of the sensor axes.
Owner:APPLE INC
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