A system comprising: a magnetic transmitter configured to generate magnetic fields; a magnetic sensor configured to generate signals based on characteristics of the magnetic fields received at the magnetic sensor; and one or more computer systems configured to: receive the signals from the magnetic sensor; determine, based on the signals received from the magnetic sensor, an electromagnetic (EM) pose of the magnetic sensor relative to the magnetic transmitter; determine one or both of: i) an inertial pose of the magnetic sensor relative to the magnetic transmitter based on inertial data associated with the magnetic transmitter and the magnetic sensor, or ii) an optical pose of the magnetic sensor relative to the magnetic transmitter based on optical data associated with the magnetic transmitter and the magnetic sensor; determine an estimated pose of the magnetic sensor relative to the magnetic transmitter based on the EM pose and the one or both of the inertial pose or the optical pose; determine distorted magnetic fields based on the EM pose; determine estimated clean magnetic fields based on the estimated pose; determine estimated distorted magnetic fields based on the distorted magnetic fields and the estimated clean fields; and determine an improved EM pose of the magnetic sensor relative to the magnetic transmitter based on the estimated distorted magnetic fields.

A method and device for compensating for an influence of a magnetic interference source on a measurement of a magnetic field sensor in a device. In the method, a magnetic flux density M.sub.1 measured with the magnetic field sensor at a measured ambient temperature T.sub.k is compensated for with a compensation factor M.sub.interference of the magnetic interference source according to

M=M.sub.1−M.sub.interference,

where

M.sub.interference=M.sub.0+aM.sub.0(T′.sub.k−T.sub.0)

and M.sub.0 is a magnetic reference flux density relative to a reference temperature T.sub.0, a corresponding to a material parameter, which is defined for a used magnet material of the magnetic interference source, and the measured ambient temperature T.sub.k being corrected using a non-linear delay parameter to a temperature of the magnetic interference source T′.sub.k. The method is used for the axis-based compensation of a temperature drift, the material parameter a being determined individually for each Cartesian axis.

An exemplary controller may include a single clock source configured to generate a single clock signal used to drive one or more components within a plurality of magnetometers and a plurality of differential signal measurement circuits configured to measure current output by a photodetector of each of the plurality of magnetometers.

An exemplary controller may include a single clock source configured to generate a single clock signal used to drive one or more components within a plurality of magnetometers and a plurality of differential signal measurement circuits configured to measure current output by a photodetector of each of the plurality of magnetometers.

A method is provided for detecting and compensating a stray magnetic field when determining a rotation angle of a rotatable element to which a magnetic element is attached. A magneto-resistive sensor system comprises a first magneto-resistive sensor disposed on a first surface of a printed circuit board and a second magneto-resistive sensor disposed on a second surface of the printed circuit board opposite the first surface.

Apparatus includes a first portion of conductive material having varying response to a generated magnetic field along a length of the conductive material, wherein the first portion of conductive material produces a varying eddy current and a varying reflected magnetic field, in response to the generated magnetic field. The apparatus further includes one or more reference portions of conductive material having a relatively invariable response to the generated magnetic field, wherein the reference portion of conductive material produces a relatively invariable eddy current and a relatively invariable reflected magnetic field in response to the generated magnetic field.

Apparatus includes a first portion of conductive material having varying response to a generated magnetic field along a length of the conductive material, wherein the first portion of conductive material produces a varying eddy current and a varying reflected magnetic field, in response to the generated magnetic field. The apparatus further includes one or more reference portions of conductive material having a relatively invariable response to the generated magnetic field, wherein the reference portion of conductive material produces a relatively invariable eddy current and a relatively invariable reflected magnetic field in response to the generated magnetic field.

In a method for operating, an absolute measuring position detection system having a sensor arrangement (100) and a single-track magnetic code object (105) with non-repeating code regions, wherein the sensor arrangement (100) is formed by a substantially linear arrangement of a plurality of magnetic field sensors (110), it is provided in particular that the relative position of the sensor arrangement (100) with respect to the respective code object (105) is determined by searching for a partial pattern which is most similar to a currently sensor-detected partial pattern on the basis of available reference data containing magnetic curve progressions or magnetic patterns of magnetic field vector components detected by sensors for the entire code object (105) depending on the position on the code object (105).

Various embodiments of the present technology relate generally to the field of imaging the spatial distribution of magnetic field of biologic and non-biologic materials that may change over time and more particularly to the apparatus and methods for making such a static or dynamic spatial imaging of magnetic field distributions. Some embodiments provide for apparatus and methods for a novel magnetographic camera which enables a unique ability to determine the spatial distribution of magnetic field in a biological or non-biological sample with high spatial and temporal resolutions and high sensitivity. The use of these embodiments will greatly expand the applications of OPM-based cameras in medicine, science and industry.

A magnetic field sensor is provided, including a substrate, a first bridge circuit formed on the substrate, the first bridge circuit being arranged to generate a first signal indicative of a motion of a target, and a second bridge circuit formed on the substrate, the second bridge circuit being arranged to generate a second signal indicative of whether the magnetic field sensor is aligned with the target.