Inductive position sensors for sensing relative position (e.g., relative rotary position) between members are provided. In one example implementation, the inductive position sensor includes a transmit aerial having at least one transmit winding. The inductive position sensor can include a receive aerial having one or more receive windings. The inductive position sensor can include a coupling element operable to be disposed on the second member. The inductive position sensor can include processing circuitry configured to provide one or more signals indicative of the position of the first member relative to the second member based on current induced in the one or more receive windings resulting from an oscillating signal provided to the transmit winding. The inductive position sensor includes at least one electrostatic shield. The electrostatic shield can include a plurality of conductive traces arranged so that no current loops are formed in the electrostatic shield.

In one example implementation, a rotary position sensor can include a first member and a second member, one of the first and second members having a transmit aerial and a receive aerial and the other of the first and second members having an intermediate coupling element. The receive aerial has at least one receive conductive winding arranged to form a first set of current loops and a second set of current loops. The intermediate coupling element comprises a conductive material arranged in a pattern. The pattern of the intermediate coupling element and the layout of the first and second set of current loops are mutually arranged such that any electromotive force induced in the first set of current loops by a background magnetic field is substantially balanced by an electromotive force induced in the second set of current loops by the background magnetic field.

A processing device of a displacement detection device includes an AD conversion device, a switching circuit, and an arithmetic processing unit. The AD conversion device has first and second AD conversion units. The switching circuit periodically switches between a first connection mode in which a first differential signal is AD-converted by the first AD conversion unit and a second differential signal is AD-converted by the second AD conversion unit, and a second connection mode in which the first differential signal is AD-converted by the second AD conversion unit and the second differential signal is AD-converted by the first AD conversion unit. The arithmetic processing unit outputs displacement information of a scale based on an addition average value of the first differential signals output from the first and second AD conversion units and an addition average value of the second differential signals output from the first and second AD conversion units.

A position sensor includes a first transmission coil, a second transmission coil having a different shape from the first transmission coil, a receiver coil for receiving electromagnetic waves transmitted from the first and second transmission coils, a transmission waveform generator that inputs first and second input waves to the first and second transmission coils having frequencies identical to each other and having phases different from each other, and a position detector that detects a position of a target provided movably with respect to the first transmission coil, the second transmission coil, and the receiver coil based on a first output signal obtained from the receiver coil in response to the first and second input waves input from the transmission waveform generator to the first and second transmission coils, respectively. The position detector is configured to detect the position of the target based on values obtained by sampling the first output signal obtained from the receiver coil at least two times at a sampling period different from an integer multiple of a half of a period of the first input wave and the second input wave. This position sensor can simplify circuitry.

A position sensor for a bleed valve with a piston, a valve disc, and a piston linkage to couple the piston and the valve disc, the position sensor includes a coil, and a core assembly, including a core disposed within the coil, a link retainer coupled to the piston, and a connecting rod coupled to the core and the link retainer.

In a position detection device of a type that omits a secondary coil, various inconveniences arising from the use of a voltage-dividing resistance (fixed resistor) are eliminated. At least two pairs of coils are provided. A magnetism-responsive member are placed so as to effect relative displacement in relation to the coils, the relative position of the member in relation to the coils varies with a position of a detection object, and impedance of each coil is varied with the relative position. The impedance changes of two coils constituting each one of coil pairs present characteristics of mutually opposite phase characteristics. For each coil pair, the two coils constituting the pair are connected in series with each other, and from a connection point thereof, a voltage-divided output voltage according to the impedance of the two coils is taken out as a detection output signal for the pair.

Rotary position sensors are provided. In one example implementation, a rotary position sensor can include a first member and a second member, one of the first and second members having a transmit aerial and a receive aerial and the other of the first and second members having an intermediate coupling element. The receive aerial has at least one receive conductive winding arranged to form a first set of current loops and a second set of current loops. The intermediate coupling element comprises a conductive material arranged in a pattern. The pattern of the intermediate coupling element and the layout of the first and second set of current loops are mutually arranged such that any electromotive force induced in the first set of current loops by a background magnetic field is substantially balanced by an electromotive force induced in the second set of current loops by the background magnetic field.

A position sensing circuit that can be used with a position control device including a differential sensing coil unit having a first sensing coil and a second sensing coil disposed to face a conductor disposed on one side of a lens barrel. The position sensing circuit includes: a differential oscillation circuit generating a first oscillation signal having a first amplitude based on a first inductance of the first sensing coil, variable according to positional movement of the conductor, and a second oscillation signal having a second amplitude based on a second inductance of the second sensing coil, variable according to positional movement of the conductor; an amplitude detection circuit detecting the first amplitude of the first oscillation signal and the second amplitude of the second oscillation signal; and a signal processing circuit calculating the first amplitude and the second amplitude to calculate a position value.

A sensor including a circuit carrier, a number of measuring inductors on the circuit carrier, and a reference inductor that is coupled to the measuring inductors.

A composite cylinder for an actuator. The cylinder includes: a radially inner fibre-reinforced polymer layer defining a hollow bore; a radially outer fibre-reinforced polymer layer; a primary conductive coil, and a first and second secondary conductive coil wound between the radially inner fibre-reinforced polymer layer and the radially outer fibre-reinforced polymer layer. The first secondary conductive coil extends axially along at least a first region of the cylinder and the second secondary conductive coil extends axially along at least a second region of the cylinder, and wherein the primary conductive coil extends axially along at least a central region of the cylinder between the first region and the second region.