Abstract: A system, apparatus, and method of quickly inspecting tubes of chemical plants is provided, where one or more tube inspection apparatuses are used to simultaneously perform electromagnetic testing (“ET”) of multiple tubes of a chemical plant by simultaneously lowering probes into separate tubes and transmitting the data to a processor. In some embodiments, the data from the probes can be transmitted in real or near-real time to a remote processor for analysis to determine whether any defects exist in the tubes and the extent of such defects.

Abstract: Various embodiments include apparatus and methods implemented to monitor detection of a flood front of a waterflood in a formation. Embodiments can include control of current in a set of three current electrodes to inject current into a formation around a pipe in a wellbore, where the three current electrodes include two of the electrodes to inject current and the third electrode to operatively provide a current return. Response of the formation to the current injections can be communicated by interrogating an optical fiber that extends along a longitudinal axis of the pipe. Determination of progression of the waterflood with respect to the wellbore can be provided from controlling the current and interrogating the optical fiber over time. Additional apparatus, systems, and methods are disclosed.

Abstract: An apparatus for detecting an electromagnetic signal originating in a wellbore includes an antenna comprising a pair of spaced apart electrodes in the ground spaced apart by a first distance having a midpoint at a second distance from the wellbore. The system includes at least one of a shielded electrical cable connecting each electrode to an input of a detector circuit, wherein the shielding is connected to produce common mode noise rejection; b) a second spaced apart electrode pair antenna spaced apart by one half the first distance and having a midpoint spaced ?2/2 times the second distance from the surface of the wellbore, c) a second electrode pair antenna having a common midpoint with and being orthogonal to the at least one electric dipole antenna; and d) wherein the at least one electric dipole antenna is disposed in a second wellbore, the second wellbore having substantially no electrically conductive pipe therein.

Abstract: It may be difficult to determine the location of objects underwater, especially when they are buried below a seabed. A system for detecting conductive objects underwater may include a long conductive cable in electric communication with a signal generator. When the cable is positioned proximate to the conductive object, its signal may induce a current and a detectible secondary magnetic field in the conductive object. A sensor, preferably positioned distally from any portion of the conductive cable, may detect the secondary magnetic field and thereby determine the location of the conductive object. A method of detecting and mapping the location of a buried underwater pipeline comprising a conductive material may include: sending a predetermined current through a conductive cable attached to a first water vehicle; inducing an induced current in the pipeline; and detecting the location of at least a portion of the pipeline by a sensor attached to a second water vehicle.

Abstract: A Hall sensor has at least four sensor terminals for connecting the Hall sensor and a plurality of Hall sensing element shaving element terminals. The Hall sensing elements are interconnected with the element terminals in a connection grid in between the sensor terminals, the connection having more than one dimension. The Hall sensing elements are physically arranged in an arrangement grid having more than one dimension and being different from the connection grid. At least some of the Hall sensing elements are connected to at least two adjacent Hall sensing elements in the connection grid.

Abstract: A sensing mechanism includes a magnetic source, a magnetic flux sensor, a sensor backing on which the magnetic source and flux sensor are mounted, and a ferromagnetic target, where the magnetic source, magnetic flux sensor, and ferromagnetic target are positioned to form a magnetic circuit from the magnetic source to the target, from the target to the sensor, and returning to the magnetic source through the sensor backing.

Abstract: A sensor circuit includes a first magnetoresistor. The first magnetoresistor has a first resistance transfer function. Furthermore, the sensor circuit includes a second magnetoresistor. The second magnetoresistor has a second resistance transfer function. The second resistance transfer function is different from the first resistance transfer function. The first magnetoresistor and the second magnetoresistor are connected in series between a first supply terminal of the sensor circuit and a second supply terminal of the sensor circuit.

Abstract: A device according to an embodiment may comprise a magneto-resistive structure comprising a magnetic free layer with a spontaneously generated in-plane closed flux magnetization pattern and a magnetic reference layer having a non-closed flux magnetization pattern.

Abstract: The present invention relates to a hall electromotive force signal detection circuit and a current sensor thereof each of which is able to achieve excellent wide-band characteristics and fast response as well as high accuracy. A difference calculation circuit samples a component synchronous with a chopper clock generated by a chopper clock generation circuit, out of an output voltage signal of a signal amplifier circuit, at a timing obtained from the chopper clock, so as to detect the component. An integrating circuit integrates an output from the difference calculation circuit in the time domain. An output voltage signal from the integrating circuit is fed back to a signal amplifier circuit via a third transconductance element.

Abstract: A current sensor device includes: at least one bus bar; at least one sensor package that includes a magneto-electric conversion element which detects a current flowing through the bus bar and an external connection terminal which is electrically connected to the magneto-electric conversion element; a printed circuit board that is disposed on the sensor package opposite to the bus bar, and electrically connected to the terminal; a magnetic shield body that shields the magneto-electric conversion element from an external magnetic field; and a resin element that integrally holds at least a part of the magnetic shield body and the bus bar fixed to the sensor package.

Abstract: Various disclosed borehole imaging tools and methods provide an improved high-resolution electrode configuration suitable for imaging in both water-based and oil-based muds. In at least some embodiments, the imaging tools employ a unitary conductive body to provide a wall-contacting face with grooves that define multiple sensing surfaces. Toroids may be seated in the grooves around each sensing surface for measuring the current flow through each sensing surface. Such placement enables a nearly ideal equipotential surface to be maintained and a straightforward “full coverage” electrode configuration due to a minimal electrode separation. Moreover, the disclosed configuration promises robust and reliable performance in the hostile conditions often experienced by logging while drilling (LWD) tools. This wall-contacting face can be provided on an extendable sensor pad or embedded on the outer surface of a LWD stabilizer fin.

Abstract: A magnetic position detecting device and a method for detecting a magnetic position are provided. An induced voltage is generated by changing a position between a pattern of an inductive ruler and an alternating magnetic field of an exciting element. A position of the exciting element is resolved by a technical means of voltage resolution for positions.

Abstract: The invention provides a rotation sensor enabling simplification of manufacturing process, such as an inspection step, while maintaining measurement accuracy of the rotation sensor. Lead frames of a rotation sensor have positioning sections which contact a side surface section of a case and, in this state of contact, keep the insertion depth dimension of a magnetism detection unit in the internal space of the case to a prescribed dimension; a flange lower flat surface of a flange section is provided further towards the case bottom surface side than a flange lower flat surface of a ring-shaped rib, a portion of the outer peripheral section of the case and the ring-shaped rib are exposed in a ring shape from an exterior molding section, and the case is provided with a plurality of projections along the inner side surface of the case which constitutes the internal space.

Abstract: A high-precision magnetic sensor, an electric motor having the magnetic sensor, and a method of manufacturing a machine having the magnetic sensor. A gap adjusting member is attached to a radially outer portion of teeth of a sensor gear. In a manufacturing process of a machine having the magnetic sensor, the gap adjusting member is positioned between a detecting part and the tooth of the sensor gear, and a state in which the gap adjusting member contacts both the detecting part and the tooth can be easily realized due to magnetic force applied between the sensor gear and the detecting part. Therefore, a desired gap corresponding to the thickness of the gap adjusting member can be easily obtained, without carrying out the burdensome and skillful operation for adjusting the gap as in the prior art.

Abstract: Aspects of the present disclosure relate to correcting for a phase shift between signals associated with an angle sensor and a multi-turn sensor that includes magnetoresistive elements. A processing circuit can determine a phase shift correction and generate position information based on at least the phase shift correction and a signal associated with the multi-turn sensor.

Abstract: A semiconductor package may include a sensor chip to measure an amount of electrical current in a current medium. The sensor chip may include a first magnetic sensing element and a second magnetic sensing element. The semiconductor package may include a magnet that produces a magnetic field. The magnet may be arranged asymmetrically with respect to the first magnetic sensing element and the second magnetic sensing element such that a strength of the magnetic field at the first magnetic sensing element is different from a strength of the magnetic field at the second magnetic sensing element.

Abstract: An arrangement for detecting the angular position of a rotatable component includes: a magnet, configured to generate a magnetic field, and a sensor assembly, configured to detect the magnetic field, and to supply therefrom an angle signal corresponding to the angular position of the component. The sensor assembly has a first sensor group, including a first magnetically sensitive element, a second magnetically sensitive element, and a third magnetically sensitive element, a second sensor group, having a fourth magnetically sensitive element, a fifth magnetically sensitive element, and a sixth magnetically sensitive element, and an evaluation unit, which is connected to each of the magnetically sensitive elements of the first sensor group and the magnetically sensitive elements of the second sensor group and supplies the angle signal corresponding to the angular position of the component.

Abstract: A rotation angle sensing device is provided with a magnet that is placed to be integrally rotatable with a rotary shaft of a rotating body in association with a rotating body, where the shape of the magnet as viewed along the rotary shaft is substantially circular; a magnetic sensor part that outputs a sensor signal based upon a change in a direction of a magnetic field in association with the rotation of the magnet; and a rotation angle detecting part that detects a rotation angle of the rotating body based upon the sensor signal output by the magnetic sensor part. The magnet has a component of a magnetization vector in a direction that is orthogonal to the rotation axis.

Abstract: An illustrative permanent electromagnetic (EM) monitoring system including a casing string positioned inside a borehole penetrating a formation, a source electrode attached to the casing string, an electrically insulating layer on an outer surface of the source electrode that provides a capacitive coupling of the source electrode to the formation, a power supply coupled to the source electrode which injects electrical current into the formation via the capacitive coupling, and a processing unit that determines a formation property based on at least the current received by a return electrode.

Abstract: A reduced-cost apparatus for calibrating the sensitivity and orthogonality of a triaxial magnetometer, and a method for adjusting the distance between the two coils of a Helmholtz coil and other related parameters are described herein. A method can include positioning a calibrated magnetometer within a mounting fixture between two coils of a Helmholtz coil, the two coils arranged in mutually parallel planes and separated by the radius of the Helmholtz coil, the mounting fixture mounted such that a position of the mounting fixture is adjustable along an axis orthogonal to the mutually parallel planes; adjusting the position of the mounting fixture over at least some of the positions and measuring the magnetic field at each position to generate a set of magnetic field measurements associated with the positions; and adjusting the first distance based on the first set of magnetic field measurements. Additional apparatuses, systems, and methods are disclosed.