A sensor system includes a first group of sensor elements sensitive to a magnetic field in a predetermined direction, wherein the first group of sensor elements supplies a first signal indicative of the magnetic field in the predetermined direction. Further, the sensor system includes a second group of sensor elements sensitive to the magnetic field in the predetermined direction, wherein the second group of sensor elements supplies a second signal having a relative phase shift relative to the first signal. A combination of the first signal and the second signal indicates a rotational angle of an object.

A magnetic field detection device includes a magnetic field detection element, a modulation coil, and a demodulator. The magnetic field detection element has a sensitivity axis in a first direction. The modulation coil is configured to apply, to the magnetic field detection element, an alternating current magnetic field having a first frequency and a component in a second direction, the second direction being orthogonal to the first direction. The demodulator is configured to demodulate an output signal having the first frequency and outputted from the magnetic field detection element, and detect, on a basis of an amplitude of the output signal, an intensity of a measurement magnetic field to be received by the magnetic field detection element.

A magnetism detection device includes: a transmission line set having a transmission line including a linear first conductor including a magnetic material; and a detector that: inputs, from a first end of the transmission line set, a pulse signal as a first incident wave and detects, at the first end, a first reflected wave of the first incident wave; inputs, from a second end opposite to the first end, a pulse signal as a second incident wave and detects, at the second end, a second reflected wave of the second incident wave; and detects a strength of a magnetic field applied to the transmission line set based on compositing of the first reflected wave and the second reflected wave.

Methods and apparatus for a sensor with a main coil to direct a magnetic field at a rotating target for inducing eddy currents in an end of the target and a sensing element to detect a magnetic field reflected from the target, wherein the target end comprises a conductive surface. The reflected magnetic field can be processed to determine an angular position of the target.

The present invention provides a triaxial magnetism detecting apparatus having a high mechanical strength and being compact in size by simplifying the arrangement configuration of magnetism detectors for the reduction of the number of components and allowing easy angular adjustment of the magnetism detectors and easy installation of the magnetism detectors on the apparatus body, and a satellite. A triaxial magnetism detecting apparatus has a power supply board, a circuit board, and a magnetism detecting unit, which are fixed on a body, and the circuit board and the magnetism detecting unit are horizontally connected. By using the magnetism detecting unit, the triaxial magnetism detecting apparatus detects magnitudes of magnetic fields in mutually perpendicular X-axis, Y-axis, and Z-axis directions.

A sensor die may include a set of sensing elements and a test structure associated with determining a magnetic sensitivity of the set of sensing elements. The test structure includes a first test sensing element sensitive in a direction in a plane defined by a surface of the sensor die, a second test sensing element sensitive in the direction in the plane defined by the surface of the sensor die, and a wire on chip (WoC) associated with applying a magnetic field to the first test sensing element and the second test sensing element. The first test sensing element, the second test sensing element, and the WoC may be arranged such that, when current flows through the WoC, the first test sensing element senses a component of the magnetic field in the direction, and the second test sensing element senses a component of the magnetic field in a perpendicular direction.

The disclosure discloses a magnetic induction intensity detection device and a terminal equipment. The magnetic induction intensity detection device provided by an embodiment of the disclosure includes: a power supply, an electroluminescence component and a current detection component, wherein the electroluminescence component and the current detection component are connected in series; the power supply is configured to supply a voltage to the electroluminescence component so that the electroluminescence component generates a current; the current detection component is configured to detect a current variation flowing through the electroluminescence component, and determine a current magnetic induction intensity according to the current variation and a correspondence between current variations and magnetic induction intensities.

A target value of magnetic flux density and magnetic flux density actually obtained are made to coincide precisely with each other. An electromagnet control device comprises a current value determining unit for determining, based on a magnetic flux density instruction value, a value of current that is made to flow through a coil. The current value determining unit is constructed to execute a second process for determining, based on a second function, a value of the current, if the magnetic flux density is to be decreased from that in a first magnetization state, and a fourth process for expanding or reducing the second function by use of a first scaling ratio for transforming it to a fourth function, and determining, based on the fourth function obtained after above transformation, a value of the current, if the magnetic flux density is to be decreased from that in a third magnetization state.

Provided is a magnetic detection device (100) having a simple configuration and being capable of stably detecting fine portions of a coin. The magnetic detection device (100) comprises an excitation coil (LX) that generates an alternating magnetic field in a transport path for transporting a coin in a first direction, and a plurality of detection coils (L1, L2) that are arranged at a predetermined pitch in a second direction and that output a detection signal based on an induction voltage caused by the alternating magnetic field. Each of the plurality of detection coils (L1, L2) outputs a detection signal on the basis of the induction voltage induced by the alternating magnetic field, which changes due to the coin being transported along the transportation path.

A method and system of infrastructure re-purposed magnetic signatures for mobile device indoor navigation and positioning. The method comprises determining a common spatial region in accordance with a first spatial region partially superimposed upon an at least a second spatial region, the first and at least a second spatial regions associated with a first and an at least a second magnetic signatures respectively; and generating, based at least in part on the first and at least a second magnetic signatures, a re-purposed magnetic signature associated with the common spatial region.