Abstract: A method for detecting a phase angle difference between a first periodic measurement signal and a second periodic measurement signal, wherein, for the purpose of determining a torque applied to a shaft, the two periodic measurement signals describe a rotation of the shaft at an axial distance from one another including superimposing a periodic auxiliary signal which simulates a previously known rotational speed for the shaft on the first periodic measurement signal in order to form a superimposition signal, and determining the phase angle difference on the basis of the superimposition signal and the second measurement signal.

Abstract: A magnetic sensor of a sensor unit includes magnetic sensing elements, an encapsulating portion, a primary terminal group and a secondary terminal group. Another magnetic sensor includes magnetic sensing elements, an encapsulating portion, a primary terminal group and a secondary terminal group. The magnetic sensors are mounted on a common surface of a circuit board. The adjacent two magnetic sensors, which are oriented in a common direction, are arranged such that the secondary terminal group of one of the adjacent two magnetic sensors is opposed to the primary terminal group of the other one of the adjacent two magnetic sensors. A primary output terminal and a secondary output terminal are placed asymmetrically to each other with respect to a center line of the encapsulating portion.

Abstract: A transmission assembly may include an electronics package comprising an RF generator, the electronics package having a first antenna output and a second antenna output. The transmission assembly may also include a transmission antenna formed from at least one transmission winding, the transmission antenna having a first end coupled to a first antenna output and a second end coupled to a second antenna output. In addition, the transmission assembly may include a compensation coil formed from at least one compensation winding, the compensation winding wound parallel with the transmission winding, the compensation coil having a first compensation end connected to the transmission antenna output and a second compensation end not coupled.

Abstract: There are provided a method for detecting an abnormality of a resolver, an angle detection device, a motor, and a transportation device, by which the abnormality can be detected promptly without the necessity of any complicated operations. There is provided a circuit configured to switch between a sine wave and a direct current voltage to be supplied, as an excitation signal of a resolver (2). Then, immediately after the power is turned on, the direct current voltage is applied to the resolver (2), and the output voltages of the phases of the resolver (2) are measured when the direct current voltage is applied. In this situation, the output voltages of the phases are compared with each other. When none of them matches each other, it is determined that an abnormality (short-circuit abnormality, short-circuiting) occurs at the resolver (2).

Abstract: A system for detecting the absolute rotational angle of a shaft rotatable more than one revolution includes a drive wheel connected to the shaft to rotate therewith. The drive wheel includes measurement sectors adjacent to one another in a circumferential direction. First and second driven wheels are engaged to the drive wheel. First and second sensors monitor rotational positions of the driven wheels to thereby detect an absolute rotational angle of the shaft. A third sensor monitors a relative angular position of the shaft in relation to a detected one of the measurement sectors to thereby detect the relative angular position of the shaft within one revolution of the shaft. The detected absolute rotational angle of the shaft is refined with the detected relative angular position of the shaft to thereby generate the absolute rotational angle of the shaft with more precision.

Abstract: A magnetic field sensing apparatus and a detection method thereof are provided. The magnetic field sensing apparatus includes first and second AMR resistors, a current generator, and an arithmetic device. A magnetized direction of the first AMR resistor is set as a first direction. A magnetized direction of the second AMR resistor is set as a second direction opposite to or the same as the first direction. The current generator provides a current in a direction parallel to the first direction to flow through the first and second AMR resistors. The arithmetic device obtains a first detection voltage according to a voltage difference between two terminals of the first AMR resistor, obtains a second detection voltage according to a voltage difference between two terminals of the second AMR resistor, and performs his an arithmetic operation on the first and second detection voltages to obtain a first magnetic field detection result.

Abstract: According to aspects of the present disclosure, an example downhole tool may include tool body, a first pad radially extendable from the tool body, and a radial array of conformable sensors coupled to the first pad. At least one conformable sensor of the radial array of conformable sensors may include a first flexible material. A transmitter may be coupled to one of the tool body and the first flexible material, and a receiver may be coupled to one of the tool body and the first flexible material. At least one of the transmitter and the receiver may be coupled to the first flexible material.

Abstract: An integrated circuit includes a leadframe, and a die having a top surface, a bottom surface, and a plurality of perimeter sides and including at least one magnetic field sensor element disposed proximate to the top surface, wherein the bottom surface is bonded to the leadframe. A molded magnetic material encapsulates the die and at least a portion of the leadframe, and provides a magnetic field substantially perpendicular to the top surface of the die. A non-magnetic material is disposed between the die and the molded magnetic material at least along perimeter sides of the die intersecting a lateral magnetic field component which is parallel to the top surface of the die.

Abstract: An eddy current monitoring system may include an elongated core. One or more coils may be coupled with the elongated core for producing an oscillating magnetic field that may couple with one or more conductive regions on a wafer. The core may be translated relative to the wafer to provide improved resolution while maintaining sufficient signal strength. An eddy current monitoring system may include a DC-coupled marginal oscillator for producing an oscillating magnetic field at a resonant frequency, where the resonant frequency may change as a result of changes to one or more conductive regions. Eddy current monitoring systems may be used to enable real-time profile control.

Abstract: An underwater EM measurement system, which is substantially smaller, much simpler to use, and more robust than prior systems, is formed as a sensor package integrated into a single pressure vessel includes two magnetic sensors including induction coils disposed substantially horizontally so as to measure fields in orthogonal directions. The package also includes two electric field sensors including electric potential antennas adapted to couple to a water potential via a capacitive electrode having a conducting material and an electrically insulative layer formed of an insulating material. The capacitive electrode has a capacitance to the medium of greater than 1 mF. Preferably, the insulating material is a metal oxide.

Abstract: A position detector includes a magnet disposed between first ends of first and second magnetic flux transmission parts and a magnet disposed between second ends of the first and second magnetic flux transmission parts. The position detector also includes a Hall IC that is positioned within a gap and moves relative to a rotating body. The Hall IC detects a density of the magnetic flux from the first and second magnetic flux transmission parts and outputs a signal according to the density of the magnetic flux passing therethrough in order to detect a position of a detection object. A minimum magnetic flux density position within the gap may be shifted to a position having the highest detection accuracy such that the position detection accuracy of the detection object is improved.

Abstract: A position detector has a Hall IC movably disposed on a mold within a gap between a first magnetic flux transmission part and a second magnetic flux transmission part for outputting a signal according to a density of a magnetic flux passing therethrough. Movement of the Hall IC relative to a rotating body is detected by the Hall IC. The Hall IC has a first flux collector and a second flux collector. A magnetic resistance of a first magnetic path between the first flux collector and a first flux transmission part and a magnetic resistance of a second magnetic path between the second flux collector and a second flux transmission part are configured so that the Hall IC is movable relative to the rotating body at a predetermined radial distance where the magnetic flux density decreases to a minimum.

Abstract: The present invention relates to a method and a device for measuring currents or magnetic fields using at least one Hall sensor, which is operated with spinning current technology. In addition to first sample values for calculating a spinning current measurement value (6), second sample values are formed from the digitally converted sensor signals (1) of the Hall sensor in the method. The second sample values are formed over shorter periods of time (9) and are corrected with an offset, which is calculated from the spinning current measurement value (6) and the first sample values. In addition to the precise spinning current measurement value (6), fast offset-corrected measurement values (10) of the magnetic field or current are obtained using the method and the associated device, without elaborate calibration or additional analog circuitry expenses.

Abstract: A detector to measure the displacement of relatively moveable bodies along an axis comprising: a resonant electrical intermediate device further comprising an inductor, whose width varies along the displacement axis, and a capacitor in electrical series which co-operates with an antenna comprising transmit and receive windings whose mutual inductance varies according to the position of the electrical intermediate device relative to the antenna.

Abstract: Sensor arrangement for measuring a rotation speed of a salient member of a rotatable body comprising a first electrode arrangement providing a first input, a second electrode arrangement providing a second input different from the first input, the first and second electrode arrangements configured so noise in the first and second inputs is substantially the same, and wherein variations in the first and second inputs are caused by rotation of the rotatable body and the salient member past the first and second electrode arrangements, an output arrangement for receiving the first and second inputs, and for providing an output proportional to a difference between the first and second inputs, and a retaining member for retaining one or more of the first and second electrode arrangements and output arrangement, the speed of rotation of the salient member measurable from a variation in the output caused by rotation of that salient member.

Abstract: The present invention discloses a direct read metering device, comprising a digital counting wheel connected with a rotary shaft, a micro-controller—a ring magnet coaxially installed on the digital counting wheel, and a tunneling magnetoresistive angular displacement sensor installed radially displaced from the central axis of the annular magnet; the tunneling magneto-resistive angular displacement sensor and the ring magnet are separated by a certain distance in the direction parallel to the central axis of the ring magnet; the micro-controller is connected to the tunneling magnetoresistive angular displacement sensor and used to convert the output of the tunneling magnetoresistive angular displacement sensor into a readable number.

Abstract: A position detector includes a magnet disposed between first ends of first and second magnetic flux transmission parts and a magnet disposed between second ends of the first and second magnetic flux transmission parts. The position detector also includes a Hall IC that is positioned within a gap and moves relative to a rotating body. The Hall IC detects a density of the magnetic flux from the first and second magnetic flux transmission parts and outputs a signal according to the density of the magnetic flux passing therethrough in order to detect a position of a detection object. A minimum magnetic flux density position within the gap may be shifted to a position having the highest detection accuracy such that the position detection accuracy of the detection object is improved.

Abstract: Instead of tapping a mechano-elastic desnity wave (MEDW) from a wave conductor or a Villary band through a detector coil, a changing field strength H is captured by a XMR sensor which is positioned on a wave conductor or proximal to the wave conductor or on a Villary band or proximal to the Villary band.

Abstract: A method of manufacture of a sensor, the method comprising, in a first fabrication facility, forming one or more components of the sensor on a substrate; and in a second fabrication facility depositing a sensor layer, such as a magnetoresistive sensor, onto the substrate or over the one or more components. Otherwise contaminating effects of depositing magnetoresistive materials can thus be confined to the second fabrication facility, permitting more advanced fabrication equipment and techniques to be employed in the first fabrication facility.

Abstract: A position detector has first and second magnets with a magnet width that is different from a gap width of a gap. As a result, the gap width and the magnet width are independent of each other. The gap width is minimized relative to a molding member that molds a Hall element. The first and second magnets have a specific magnet width that generates a required magnetic flux density without increasing the magnet width, which enables a volume reduction of the position detector.