An inductive position sensor may be configured to detect relative position between a first member and a second member. The inductive position sensor may include an inductive sensor element configured to be coupled to the first member and a screening layer formed over a screened portion of a member surface of the second member such that an exposed portion of the member surface is free of the screening layer. The screening layer may be configured to reduce an effect on induced signals in the inductive sensor element caused by the screened portion of the second member.

The present disclosure relates to displacement measurements using magnetic displacement measurement units. In various embodiments, the disclosed displacement measurement unit is configured to determine a displacement position of a vehicle along a guideway. In various embodiments, the displacement measurement unit includes a set of locator devices that are distributed at fixed displacement positions along the guideway, where a given locator device includes a magnetic element configured to produce a corresponding magnetic field. Further, in various embodiments, the displacement measurement unit includes a position sensor that is attached to the vehicle, where the position sensor is configured to detect a magnetic field produced one or more of the locator devices when the position sensor is brought within a detection range of one or more locator devices.

A resolver decoder circuit includes: a first filter circuit configured to calculate a first weighted sum of a first digital signal over a pre-determined period of time, where the first digital signal includes first digital samples of a first analog signal from a sine winding of a resolver; a second filter circuit configured to calculate a second weighted sum of a second digital signal over the pre-determined period of time, where the second digital signal includes second digital samples of a second analog signal from a cosine winding of the resolver, where the first and the second analog signals are configured to be induced by a sine signal applied to an input winding of the resolver; and a rectifier configured to generate a first output and a second output by adjusting a first sign of the first weighted sum and adjusting a second sign of the second weighted sum, respectively.

A position detection device includes a position sensor including a coil and a magnetic core, and a signal processor. The signal processor generates a rectangular wave voltage applied to the coil, converts a current which flow through the coil by the rectangular wave voltage into a voltage and outputs the voltage, and acquires a voltage measurement value obtained by sampling the output voltage after predetermined time in synchronization with a timing of rising or falling of a waveform of the rectangular wave voltage. The predetermined time is set such that the voltage measurement value is restricted within a range of 40% or more and 99.999% or less with respect to a maximum value of the rectangular wave voltage when the coil is at a position where an inductance of the coil is minimum.

A system comprising: one or more field generating coils configured to generate a magnetic field; a sensor comprising a shell that contains a ferrofluid, the sensor configured to be introduced in proximity to the magnetic field, wherein the ferrofluid causes distortion of the magnetic field when the ferrofluid is in proximity to the magnetic field; and one or more field measuring coils configured to: measure a characteristic of the magnetic field when the ferrofluid is in proximity to the magnetic field; and provide, to a computing device, a signal representative of the measured characteristic of the magnetic field, wherein the computing device is configured to determine one or both of a position and an orientation of the sensor based on the measured characteristic of the magnetic field.

In accordance with one embodiment of the present disclosure, an inductive position sensor assembly is provided. The inductive sensor assembly includes a sensor and a coupler element. The sensor includes a transmitter coil having an inner diameter and an outer diameter and a receiver coil positioned within the outer diameter of the transmitter coil. The coupler element has a geometric continuous curve shape. The coupler element is positioned within the outer diameter of the transmitter coil such that a maximum diameter of the geometric continuous curve shape is the outer diameter of the transmitter coil. When the coupler element is moved, the geometric continuous curve shape of the coupler element modify an inductive coupling between the transmitter coil and the receiver coil.

A target configured to be used with a position sensor for sensing a position of the target is described. The target includes at least one elongated conductive loop structure for allowing eddy currents to flow therein and configured to affect a magnetic field received from the position sensor in a preferred direction along the at least one elongated conductive loop structure.

A rotation sensing apparatus includes a detected part, a sensor unit, and a rotation information calculation circuit. The sensor unit includes a first sensor disposed opposite to a first pattern portion, a second sensor disposed opposite to a second pattern portion, a third sensor disposed to be spaced apart from the first sensor in the rotation direction and opposite to the first pattern portion, and a fourth sensor disposed to be spaced apart from the second sensor in the rotation direction and opposite to the second pattern portion. The rotation information calculation circuit is configured to sense the rotation direction, in response to a differential signal, generated based on the first oscillation signal and the second oscillation signal, and an oscillation signal corresponding to maximum and minimum frequencies, from among the first oscillation signal, the second oscillation signal, the third oscillation signal, and the fourth oscillation signal.

A method for installing a stroke sensor is provided such that the stroke sensor can be easily adjusted using a simple process. The method has the steps of; obtaining a relationship between the magnetic field and the indicator value while moving the magnet in the first direction relative to the magnetic field detecting element within a predetermined relative movable range, and writing the relationship in the processor; after the relationship is written in the processor, preventing the predetermined relative movable range from being shifted in the first direction by means of a jig for preventing positional shift, wherein the jig includes an element that fixes relative positions between the magnetic field detecting element and the magnet; attaching the magnet and the magnetic field detecting element, which have been prevented from being shifted, to different structures that are movable in the first direction relative to each other, and removing the jig.

A non-contact respiratory monitoring system, method, and sensor are disclosed. The system includes a magnet and a sensor including a coil made of magnetic microwire. The magnetic microwire sensor coil is configured to detect motion of the magnet relative to the magnetic sensor coil. An alternating voltage across the magnetic microwire sensor coil is modified by a change in impedance of the magnetic microwire sensor coil caused by the change in the distance of the magnet from the magnetic microwire sensor coil. The non-contact respiratory monitoring method includes changing a distance of a magnet from a magnetic sensor coil. The sensor includes a coil composed of high quality melt-extracted amorphous microwire.