Abstract:
Die Erfindung betrifft ein Verfahren zum Zurücksetzen eines magnetoresistiven Umdrehungssensors auf einen definierten Zustand, wobei der Umdrehungssensor mindestens ein Sensorelement aus mindestens einer ferromagnetischen sensitiven Schicht und mindestens einer ferromagnetischen Referenzschicht getrennt durch eine nichtmagnetische Schicht und einen rotierbaren Triggermagneten mit einem ersten Magnetfeld umfasst, der relativ zu dem mindestens einen Sensorelement zur Änderung der Magnetisierung in zumindest einem Teilbereich der sensitiven Schicht verdrehbar ist. Das Verfahren zeichnet sich dadurch aus, dass durch ein Anlegen eines zweiten Magnetfeldes eine Neuausrichtung der Magnetisierung in der sensitiven Schicht erreicht wird.
Abstract:
A magnetic field sensor includes at least one magnetic field sensing element configured to generate a measured magnetic field signal responsive to an external magnetic field and to generate a reference magnetic field signal responsive to a reference magnetic field and a calibration circuit configured to divide the measured magnetic field signal by the reference magnetic field signal to generate a calibrated magnetic field signal. The calibrated signal has reduced susceptibility to stress influences.
Abstract:
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.
Abstract:
An apparatus comprising: a processor; and a memory including computer program code, the memory and the computer program code configured to, with the processor, cause the apparatus to perform at least the following: determine whether or not recalibration is required of a magnetometer configured to compensate for hard-iron and soft-iron effects by determining whether a plurality of magnetometer readings received from the magnetometer is consistent with: a scaled pre-calibrated matrix describing the soft-iron effect for at least one scaling factor of the pre-calibrated matrix; and a pre-calibrated vector describing the hard-iron effect.
Abstract:
An automated circuit test system includes a magnetic sensor array configured to measure, at a plurality of locations, a magnetic field induced by a circuit under test. A circuit drive module can energize the circuit under test to induce the magnetic field. Optionally, the circuit drive module detects an electrical response from the circuit under test. Optionally, magnetic field data is combined with electrical response data prior to outputting the test result.
Abstract:
A sensor assembly is provided for use in tracking a medical device. The sensor assembly comprises a magnetoresistance sensor capable of providing position and orientation information. In certain implementations, the magnetoresistance position and orientation sensor is originally configured for connection to a substrate using one type of interconnect approach but is modified to be connected using a different interconnect approach.
Abstract:
A multi-dimensional sensor, a magnetometer or accelerometer, is calibrated based on the raw data provided by the sensor. Raw data is collected and may be used to generate ellipse or ellipsoid parameters, for a two-dimensional or three-dimensional sensor, respectively. An offset calibration factor is calculated based on the raw data, e.g., the determined ellipse or ellipsoid parameters. A sensitivity calibration factor is then calculated based on the offset calibration factor and the raw data. A non-orthogonality calibration factor can then be calculated based on the calculated offset and sensitivity calibration factors. Using the offset, sensitivity and non-orthogonality calibration factors, the raw data can be corrected to produce calibrated data.