An inductive sensor includes a sensor package and a coupler package. The sensor package includes a signal processor, an integrated capacitor, a ferrite layer, a transmitter coil, a two part receiving coil, and a plurality of discrete components. The coupler package includes an integrated capacitor, a ferrite layer, and a coupler coil. The transmitter coil in the sensor package is energized by an external power source which in turn energizes the coupler coil in the coupler package. The sensor then measures the rotational position of the coupler package relative to the sensor package by detecting and measuring, with the two part receiving coil, the signal returned by the coupler coil. The signal processor calculates the position of the coupler package relative to the sensor package by comparing the coupling factors between the coupler package and the sensor package.

A rotation-angle sensor comprises a stator element and a rotor element mounted to rotate relative to the stator element about an axis of rotation. The rotation angle is detectable by an inductive coupling between the rotor element and the stator element. A compensation element is located on the stator element and has a compensation transmitter coil to emit an electromagnetic compensation alternating field and a compensation receiver coil to receive electromagnetic alternating fields. The rotor element has a first electrically conductive portion, which is both located on the rotor element and inductively coupled to the compensation transmitter coil and the compensation receiver coil such that when the compensation transmitter coil emits the electromagnetic compensation alternating field, an alternating voltage induced in the compensation receiver coil is primarily dependent on a relative mutual radial location of the stator element and the rotor element with respect to the axis of rotation.

A gyroscopic detection system utilizes magnetic nanoparticles that are suspended in a solution and exposed to a rotating magnetic field. The nanoparticles experience angular deviation from their axes if an external force is applied to the system. Solution composition and oscillation frequency may be varied to optimize the gyroscopic feedback.

Provided is a position indicator of an electromagnetic induction type including a position indicator cartridge housed in a hollow portion of a housing, in which the position indicator cartridge includes a first resonant circuit including a first coil wound around a magnetic core arranged on one end of the position indicator cartridge in an axial direction of the position indicator cartridge and a first capacitor, a second coil that is independent of the position indicator cartridge provided outside of the position indicator cartridge, at a position where the second coil, in operation, is magnetically coupled to the first coil of the position indicator cartridge, and a switch turned on and off by an operation portion provided outside of the position indicator cartridge, the operation portion, in operation, receiving an operation of a user, and a closed circuit including the second coil is formed when the switch is turned on.

A method for determining the position of the cores of a twisted-pair cable is intended to allow twisted-pair cables to be connected using the piercing technique. For this purpose, at a plurality of points in a scanning region which is axially and/or azimuthally extended with respect to an axis of the twisted-pair cable, an inductive coupling between a first circuit arranged at each respective point and the twisted-pair cable as a second circuit is determined, and a position of the cores of the twisted-pair cable is determined on the basis of the values determined for the inductive coupling at the points.

The subject invention relates to an air spring height measurement arrangement comprising a magnetic field transmitting arrangement (110) and a magnetic field receiving arrangement (120). The magnetic field transmitting arrangement is adapted to adopt a first state and a second state with regard to the magnetic field receiving arrangement. One of the magnetic field transmitting arrangement (110) and the magnetic field receiving arrangement (120) comprises a first coil (141) and a second coil and the other comprises a third coil (143). A first central axis (161) of the first coil and a second central axis (162) of the second coil enclose a first angle (171) and, in the first state, a third central axis (163) of the third coil (143) and the first central axis enclose a second angle (172), which first and second angle cannot be 0.

An electronic device including a continuity sensor and electrical circuitry configured to detect and report the continuity state of an article, container or product packaging is disclosed. The continuity sensor includes a first substrate with first and second coils thereon, and a second substrate with a third coil thereon. The first coil has an integrated circuit electrically connected thereto. The first substrate is part of, or is attached or secured to a part of the article, container or packaging. The second substrate is another part of, or is attached or secured to another part of the article, container or packaging. One of the article, container or packaging parts is (re)movable with respect to the other part. The first and second coils have one coupling when the article, container or packaging is closed or sealed, and a different coupling when the article, container or packaging is open or unsealed.

Systems and methods for sensing angular displacement between body segments of users include disposing an electromagnetic transmitting sensor about a first body segment and an electromagnetic receiving sensor about a second body segment. Data related to the magnetic field coupling between the transmitting and receiving sensors can be captured for determining the angular displacement between the first and second body segments.

A rotation angle sensor system for an optical system that includes a rotor and a stator, includes a stator-based coil system having an inductance and for generating and transmitting a magnetic alternating field, and a rotor-based target that functions as an eddy current element for receiving the magnetic alternating field and generating a magnetic eddy current field. The coil system and the target are mounted or mountable fixedly, with respect to rotation, on the stator and the rotor, respectively, in such a way that different overlaps and/or spatial proximities between the coil system and the target, with correspondingly different effects on the magnetic alternating field of the coil system, result as a function of the rotation angle and/or of the orientation between the stator and the rotor.

An apparatus includes a first resonant circuit including a first coil mounted to a movable member; a second resonant circuit including a second coil facing the first coil and generating a magnetic field upon supply of an electric current and outputs a detection signal of a voltage level depending on a relative position of the second coil to a position of the first coil; and a first equivalent circuit equivalent to the second resonant circuit in a case where a distance between the first and second coils is infinite and a second equivalent circuit equivalent to the second resonant circuit in a case where the distance is zero. A processor corrects the detection signal based on an output signal output from the first equivalent circuit and an output signal output from the second equivalent circuit, and calculates, based on the corrected detection signal, a displacement amount of the movable member.