Abstract: A magnetic field sensor includes first, second, and third magnetic field sensing elements having respective first, second and third maximum response axes, the first second and third maximum response axes pointing along respective first, second, and third different coordinate axes. In response to a magnetic field, the first, second, and third magnetic field sensing elements are operable to generate first second, and third magnetic field signals. Signals representative of the first, second, and third magnetic field signals are compared with thresholds to determine if the magnetic field is greater than the thresholds. A corresponding method is also provided.

Abstract: Disclosed are various embodiments of methods and systems related to stimulus responsive nanoparticles. In one embodiment includes a stimulus responsive nanoparticle system, the system includes a first electrode, a second electrode, and a plurality of elongated electro-responsive nanoparticles dispersed between the first and second electrodes, the plurality of electro-responsive nanorods configured to respond to an electric field established between the first and second electrodes.

Abstract: Various embodiments are described that relate to a loop with a constant phase. The loop can function as an antenna and be used in object detection. A current source can be used to power the loop such that the loop produces a magnetic field and electric field. The magnetic field can be powerful enough to detect a dielectric while the electric field is so small that it does not interfere with nearby communication equipment. Thus, detection can occur without disruption of other important devices.

Abstract: An encoder scale for an electromagnetic induction linear encoder includes a substrate, an electroconductive layer exhibiting electroconductivity and provided to one surface of the substrate, and an electric conductor provided on the electroconductive layer. The electroconductive layer is wider than the electric conductor in a plan view of the substrate and is grounded. The electroconductive layer is formed on the entire one surface of the substrate except a guide surface, and glass is exposed on the guide surface.

Abstract: An example downhole tool may include a tool body and a first conformable sensor coupled to the tool body. The first conformation sensor may include a flexible material, a transmitter coupled to the flexible material, and a plurality of receivers coupled to the flexible material. The downhole tool may further include a control unit with a processor and a memory device coupled to the processor, the memory device containing a set of instructions that, when executed by the processor, cause the processor to output control signals to a first combination of the plurality of receivers corresponding to a first operating mode; and output control signals to a second combination of the plurality of receivers corresponding to a second operating mode.

Abstract: A magnetic core flux sensor assembly may include a flux sensor core portion and an elongated opening for receiving a conductor winding through the flux sensor core portion. The flux sensor core portion may include a width from a perimeter edge of the flux sensor core portion to the elongated opening that is constant. An electrical current flowing through the conductor winding generates a magnetic field about the conductor winding and a magnetic flux flow in the flux sensor core portion. One or more sensor holes may be positioned relative to the elongated opening for sensing the magnetic flux flow at different distances from the elongated opening. A sensor conductor winding may extend through each pair of sensor holes. The magnetic flux flow generates an electrical signal in each sensor conductor winding. The electrical signal corresponds to the magnetic flux flow at a location of the particular sensor conductor winding.

Abstract: The present invention provides a light weight, modular and rigid structure for supporting the transmitter loop of an airborne electromagnetic system. The airborne electromagnetic surveying system comprises a tow assembly connected to an aircraft, the tow assembly including a transmitter section comprising a transmitter coil for generating a primary electromagnetic field that induces a secondary electromagnetic field. The transmitter coil is supported by a generally rigid transmitter frame. The transmitter frame comprises a plurality of frame sections assembled in a way such that the generally rigid transmitter frame substantially retains a rigid shape during operation. The system may also include a receiver section located above the generally rigid transmitter frame in between the aircraft and the generally rigid transmitter frame for detecting the secondary electromagnetic field.

Abstract: A method of land surveying that electronically registers together multi-layer underground and surface images of a surface volume with buried utilities and other infrastructures. Such method further comprises assembling and presenting the combination to a device in the field that visually guides crews in their safe digging of the ground nearby. The orienting, scaling, and registering of a first image layer is to a standardized orientation and scaling on a map of a photograph of a land surface from a zenith point in space above. Then the orienting, scaling, and registering of a second image layer is made to the standardized orientation and scaling on the map. This layer is a result of a ground penetrating radar investigation of buried objects point-by-point in an immediate search area of a corresponding ground surface. Underground buried objects and utilities are thereby located to make safe digging nearby.

Abstract: A resistivity measuring tool used in a drillstring having a drill bit on a distal end for drilling a wellbore in a formation includes a tool body having a longitudinal axis, a sensor configured to measure the angular position of the tool body relative to the wellbore, at least one axial antenna including a wire winding for generating an axial magnetic moment parallel with the longitudinal axis, and at least one transverse antenna. The transverse antenna includes an antenna body disposed within a pocket extending radially inward from an outer surface of the tool body and one or more turns of wire wound around the antenna body, the wire winding generating a transverse magnetic moment orthogonal to the longitudinal axis.

Abstract: To provide a surface property inspection apparatus, surface property inspection system, and surface property inspection method capable of inspecting the surface processing state of processed material subjected to surface processing such as shot-peening, heat treatment, or nitriding with high accuracy and low vulnerability to temperature changes in the inspection environment. Surface property inspection apparatus is furnished with a AC power supply, a AC bridge circuit, and an evaluation device; AC bridge circuit comprises variable resistor with which distribution ratio ? is variable, reference detector, and inspection detector. Inspection detector is furnished with a coil wound so as to oppose the surface property inspection region of object under inspection M, and by supplying AC power from AC power supply to coil, an eddy current is excited in object under inspection M.

Abstract: Embodiments of a multi-axial antenna system and system for measuring subsurface formations are generally described herein. Other embodiments may be described and claimed. In some embodiments, the multi-axial antenna system comprising at least two co-located coils wound around a torroidal-shaped bobbin. Each coil generates a magnetic field in a mutually orthogonal direction. Signals provided to the coils may be adjusted to simulate a tilted-coil antenna system.

Abstract: Magnetic locators for detection of buried objects, such as ferromagnetic objects, are disclosed. Outputs provided from two or more magnetic sensors, such as three three-axis magnetic sensors, as well as optionally from other sensors, such as accelerometers and gyroscopic sensors, may be used to determine magnetic field distortion indicative of ferromagnetic objects and/or provide output information corresponding to the detected objects based on the sensor outputs.

Abstract: A conduit sensor device includes first and second pairs of permanent magnets. First and second rotor shunts include first and second rotatable magnets and interposed between the first and second pairs of permanent magnets, respectively. A shunt shaft includes a first helical worm gear and a second helical worm gear mounted thereon. The first rotor shunt includes a first rotatable magnet and a first rotor gear locked together. The first helical worm gear meshing with the first rotor gear driving the first rotor gear and the first rotatable magnet. The second rotor shunt includes a second rotatable magnet and a second rotor gear locked together. The second helical worm gear meshes with the second rotor gear driving the second rotor gear and the second rotatable magnet. The surface areas of the first and second pairs of permanent magnets equals the surface area of the first and second rotatable magnets.

Abstract: A method of completing a well includes, pumping treating fluid into a tool string in the well, displacing drilling mud within the tool string with the treating fluid, and treating an earth formation with the treating fluid.

Abstract: In one aspect, a temperature detection circuit includes a first circuit configured to provide a first signal and a comparator circuit configured to provide a warning signal in response to the first signal if a temperature reaches a temperature value. The first signal enables determination of a parameter of a magnetic sensor.

Abstract: Embodiments relate to coreless magnetic field current sensors, systems and methods, such as magnetoresistive sensors, systems and methods, to sense current flow in a conductor via a related magnetic field.

Abstract: A lateral bipolar junction transistor (BJT) magnetic field sensor that includes a layout of two or more adjacent lateral BJT devices. Each BJT includes a semiconductor base region of a first conductivity type doping, a semiconductor emitter region of a second conductivity type doping and laterally contacting the base region; and a first semiconductor collector region of a second conductivity type doping contacting said base region on an opposite side thereof. A second collector region of the second conductivity type doping is also formed contacting the base region on the opposite side thereof in spaced apart relation with the first collector region. The first adjacent lateral BJT device includes the emitter, base and first collector region and the second adjacent lateral BJT device includes the emitter, base and second collector region. The sensor induces a detectable difference in collector current amounts in the presence of an external magnetic field transverse to a plane defined by the layout.

Abstract: Manufacturing of magnetometer units employs a test socket having a substantially rigid body with a cavity therein holding an untested unit in a predetermined position proximate electrical connection thereto, wherein one or more magnetic field sources fixed in the body provide known magnetic fields at the position so that the response of each unit is measured and compared to stored expected values. Based thereon, each unit can be calibrated or trimmed by feeding corrective electrical signals back to the unit through the test socket until the actual and expected responses match or the unit is discarded as uncorrectable. In a preferred embodiment, the magnetic field sources are substantially orthogonal coil pairs arranged so that their centerlines coincide at a common point within the predetermined position. Because the test-socket is especially rugged and compact, other functions (e.g., accelerometers) included in the unit can also be easily tested and trimmed.

Abstract: A building structure includes a block of building material and a magnetic circuit buried in the block of building material. The structure also includes a plurality of sensing devices buried in the block of building material. Each sensing device may include a contactless power supplying circuit magnetically coupled with the magnetic circuit to generate a supply voltage when the magnetic circuit is subject to a variable magnetic field.

Abstract: A magnetic field probe, a magnetic field measurement system, and a magnetic field measurement method are provided. The magnetic field probe includes a probe head. The probe head includes a first and second inner metal layer. The first inner metal layer includes a first sensing part and a first connecting part coupled thereto. The first sensing part is configured for detecting a magnetic field signal of a device under test to form a first magnetic field distribution signal. The second inner metal layer includes a second sensing part and a second connecting part coupled thereto. The second sensing part is configured for detecting the magnetic field signal of the device under test to form a second magnetic field distribution signal. A distance between the first sensing part and the device under test is smaller than that between the second sensing part and the device under test.