Abstract: An integrated circuit includes a magnetic field sensor and an injection molded magnetic material enclosing at least a portion of the magnetic field sensor.

Abstract: In a process for testing the measurement accuracy of at least one magnetic field sensor, in particular during manufacturing, a semiconductor wafer that has at least two semiconductor chips is provided. A measurement coil is integrated into at least one first semiconductor chip, and a magnetic field-sensitive electric circuit is integrated into at least one second semiconductor chip that forms the magnetic field sensor. The first semiconductor chip, of which at least one is present, is positioned at an exciter coil that is supplied with current in order to generate a reference magnetic field. With the aid of the measurement coil a first measured value that is dependent on the magnetic flux density is acquired and the current in the exciter coil is adjusted depending on the first measured value. The second semiconductor chip, of which at least one is present, is positioned at the exciter coil.

Abstract: A rotation angle sensor includes a rotation shaft, a yoke which is made from a magnetic permeable material and includes a first disk portion, a second disk portion and a connection portion magnetically connecting the first disk portion and the second disk portion, the first disk portion and the second disk portion being provided on the rotation shaft in an axial direction of the rotation shaft separately, a first permanent magnet and a second permanent magnet, each having a disk shape which has a uniform plate thickness in a circumferential direction thereof, and which are provided on a first face of the first disk portion and a second face of the second disk portion respectively, the first face being opposed to the second face, a magnetic field detection section which is provided between the first permanent magnet and the second permanent magnet, and generates an output signal in response to an intensity of a magnetic field formed by the first permanent magnet and the second permanent magnet during a rotatio

Abstract: A disclosed magnetic sensor includes a substrate having a plane surface and multiple sloping surfaces; multiple soft magnetic films each disposed on a different one of the sloping surfaces and magnetized according to strength of a magnetic field; and multiple detecting devices each disposed on the plane surface, including a free layer and a pinned layer and configured to produce a detection output according to magnetization of the free layer and the pinned layer. Each of the soft magnetic films is magnetically coupled with the free layer of a different one of the detecting devices. The pinned layers of the detecting devices have magnetization directions different from each other.

Abstract: A displacement sensor includes a primary coil (2), secondary coils (4a, 4b), and a movable magnetic core (6) movable with displacement of an object to be measured to cause voltages generated in the secondary coils (4a, 4b) to vary. The secondary coils (4a, 4b) are differentially interconnected. A polyphase signal generating unit (10) generates two-phase component signals having different phases, from a differentially combined output voltage of the secondary coils (4a, 4b). Full-wave rectifying units (16, 18) rectify the polyphase component signals, the rectified polyphase component signals are combined in a combiner (22), and the combiner output is applied to a low-pass filter (24).

Abstract: A magnetic sensor circuit of the present invention includes: a Hall device 10; selection switch circuit 20 switching a detection state of the Hall device 10 to either a first switch state or a second switch state; a comparator unit 60 performing comparison using a detection voltage of a magnetoelectric conversion device 10 aid a predetermined reference voltage to generate a comparison result signal COUT; a logic circuit 80 generating, based on an output signal OUT and the comparison result signal COUT, a logic operation signal LOUT for maintaining or inverting the logic of the output signal OUT; a latch circuit 70 latching the logic operation signal LOUT to output this as the output signal OUT; and a control circuit go determining, based on the output signal OUT, an order of switching the detection state of the Hall device 10 (from the first switch state to the second switch state, or from the second switch state to the first switch state).

Abstract: In order to examine abnormality in shape of an outer circumference of a wire rope, the rope tester device includes a comb-shaped detection plate having a curved test edge portion extending along at least one portion of an outer circumference of a substantially circular sectional configuration of the wire rope and a testing recessed portion for receiving the wire rope in the vicinity of or in contact with the test edge portion, and a support device for rotatably supporting the detection plate in the vicinity of or in contact with the wire rope for permitting the rotation of the detection plate when the detection plate receives a force from an abnormal portion of the wire rope to relieve the force. A test string is disposed in an opening of the testing recessed portion for testing a surface that is not in the vicinity of or in contact with the test edge portion.

Abstract: A transmitter antenna assembly for transient electromagnetic well logging instrument comprises an antenna coil coupled with a current source and a magnetic core having residual magnetization. Switching current in the antenna coil results in magnetization reversal in the magnetic core and change in magnetic dipole moment of the antenna. After the magnetization reversal is complete the current is removed and the new vector of magnetic dipole of the antenna maintains constant (steady-state phase of the antenna dipole) due to magnetic hysteresis of magnetic material employed for the magnetic core. No power expenditure during the steady-state phase of the magnetic dipole facilitates highly effective generation and fast switching of a large magnetic dipole. The magnetic core also serves as a shield between the antenna coil and any conductive part of the antenna assembly.

Abstract: A transducer senses repetitive pulses on a magnetostrictive element and provides transducer output bursts. A transducer circuit detects the transducer output bursts. An energy storage device couples to a power input of the transducer circuit. A switching power supply couples to the energy storage device and has repetitive suppressed states during which switching in the switching power supply is suppressed. A sequence circuit provides synchronization of the repetitive suppressed states of the switching power supply with the transducer output bursts.

Abstract: A rotation angle sensor includes a rotation shaft, a yoke which is made from a magnetic permeable material and includes a first disk portion, a second disk portion and a connection portion magnetically connecting the first disk portion and the second disk portion, the first disk portion and the second disk portion being provided on the rotation shaft in an axial direction of the rotation shaft separately, a permanent magnet which is provided between the first disk portion and the second disk portion, and has an annular shape, and a magnetic field detection section which generates an output signal in response to an intensity of a magnetic field formed by the permanent magnet during a rotation of the rotation shaft.

Abstract: A combined resistivity tool incorporating both induction/propagation antennas and lateral resistivity antennas disposed in recesses of downhole tubulars, in which a lateral resistivity antenna includes an insulating base layer disposed in the recess; a toroidal antenna disposed over the insulating base layer; and a shield disposed over the recess.

Abstract: A left-side ring magnet and a right-side ring magnet are fastened to a roller-shaped operation part, circumferentially displaced from each other by a certain angle. Magnetic variation generated by rotation of the magnets is detected by a magnetism detection element. Additionally, a left-side stationary magnet and a right-side stationary magnet, with the same magnetic pole, are annexed correspondingly to the left-side ring magnet and the right-side ring magnet, respectively, so that the stationary magnets are arranged with the same proximal arrangement relative to the ring magnets, respectively. With such a structure, two attractive and repulsive forces between the left-side ring magnet and the left-side stationary magnet; and between the right-side ring magnet and the right-side stationary magnet are totally exerted on the operation part, thereby providing a sharp, clear click touch during rotation.

Abstract: A magnetic flux generated by current excitation is allowed to pass through a part or an entire of a magnetic path of a leakage magnetic flux. A magnetic flux content due to the current excitation is temporally changed to change a leakage magnetic flux content interlinked with a detection coil so that an induced voltage is generated in the detection coil. Consequently, damage can be detected even in a case where there is no relative speed between a wire rope and a wire rope flaw detector. Further, a configuration of the magnetic path and the number of ampere turns of an exciting coil are set to be appropriate to prevent the magnetic flux generated by the current excitation from passing through the detection coil or to allow the magnetic fluxes offset each other. Thus, noise superimposition on the detection coil due to the current excitation can be prevented.

Abstract: A semiconductor component on a semiconductor chip comprises at least one sensor element for measuring a physical quantity and an evaluator. The semiconductor component can be switched between a first and a second operating mode. In the first operating mode, the sensor element is sensitive to the physical quantity to be measured and a measurement signal output of the sensor element is connected to an input connection of the evaluator. In the second operating mode, the sensor element is not sensitive to the physical quantity to be measured and/or the signal path between the measurement signal output and the input connection is interrupted. A test signal source for generating a test signal simulating the measurement signal of the sensor element is arranged on the semiconductor chip. In the second operating mode, the test signal source is connected or capable of being connected to the input connection of the evaluator.

Abstract: Disclosed is an arrangement for the intrinsically safe detection of movements of a body, such as a wheel. The arrangement includes a magnetic encoder (5, 25) and a sensor (26), the magnetic encoder (5, 25) moving with the body and is magnetically coupled to at least two sensor elements (S1, S2) of the sensor (26) via a magnetic air gap. The sensor (26) has at least two mutually separate signal paths (S1, fl; S2, f2) which have at least one of the sensor elements (S1, S2) and a signal conditioning stage (28, 29). A primary measuring signal path (S1, f1) is constructed so that during normal operation represents an output signal the basic frequency of the encoder movement or the temporal profile of the output signal have patterns. The temporal occurrence of the patterns correspond to the basic relative speed between the sensor (26) and the pole pairs of the encoder (5, 25) which are detected by the sensor.

Abstract: Measurements made with a multicomponent logging system oriented in a horizontal position above the surface of the earth must satisfy certain relationships. These relationships are used to establish calibration errors in the system.

Abstract: A radial position sensor includes a rotating element configured to rotate about an axis of rotation, which subject to displacement. The displacement from a first position to a second position can be represented by polar coordinates, e.g., (?, ?), where ? is a distance and ? is an angle. The sensor also includes a non-rotating emitting element configured to provide a plurality of electromagnetic fields and a non-rotating receiving element configured to receive the plurality of electromagnetic fields. The plurality of electromagnetic fields are electromagnetically coupled to the non-rotating receiving element through the rotating element. The electromagnetic coupling varies in dependence on the radial position of the axis of rotation of the rotating element. The non-rotating receiving element produces an output signal in response to the amount of coupling of the plurality of electromagnetic fields, and so the output signal is an indication of the radial position of the axis of rotation.

Abstract: As imaging devices are miniaturized, and optical devices are miniaturized, lens moving mechanisms are also miniaturized. Thus, position sensors for them are required to be miniaturized and have high accuracy at low cost. A magnet of a pillar shape and a yoke which move in the X axis direction with respect to a magnetic field detection element are provided, and a shape of a cross section of the yoke which is orthogonal to a longitudinal direction of the magnet changes along the longitudinal direction.

Abstract: A rotating, transversely magnetized, magnet on a drill collar induces magnetization in a casing of a preexisting well. A coil rotating synchronously with the magnet produces a current at twice the frequency of rotation and having an amplitude that depends upon the distance from the magnet to the preexisting well. Alternatively, a variable magnetic field is produced in the casing using a switchable magnet.

Abstract: In a speed reducing electric motor, a speed reducing gear unit has a sensor magnet device, which is fixed to a worm wheel and includes an inner ring magnet, an outer ring magnet and connecting portions. The inner ring magnet is placed along a predetermined first imaginary circle. The outer ring magnet is placed along a predetermined second imaginary circle, which is coaxial with the first imaginary circle and has a diameter that is smaller or larger than that of the first imaginary circle. The connecting portions connect between the inner ring magnet and the outer ring magnet. The sensor magnet device is fixed to the worm wheel by a magnet fixing structure.