Abstract: Provided is an electromagnetic coil arrangement comprising a set of electromagnetic sensors at fixed locations with respect to each other, each of the electromagnetic sensors comprising a planar coil coupled to a conductive layer, the planar coil comprising non-concentric rings. Further, provided is an electromagnetic tracking system, comprising an electromagnetic coil arrangement, at least one complementary electromagnetic sensor and a processor configured to process a signal comprising data indicative of a mutual inductance between the at least one complementary electromagnetic sensor and each of the set of the electromagnetic sensors of the electromagnetic coil arrangement. Also, provided are a method of tracking and a method of manufacturing an electromagnetic coil arrangement.

Abstract: In accordance with the present disclosure, a system and a method are disclosed for measuring a time varying magnetic field. In one aspect, a system comprises a plurality of induction coils arranged to measure the time varying magnetic field using at least one voltage induced in at least one of the induction coils in the plurality of induction coils, a plurality of snubber circuits connected to the plurality of induction coils, each of the snubber circuits of the plurality of snubber circuits arranged to suppress a resonance of a respective one of the induction coils of the plurality of induction coils, and a summing circuit connected to each of the snubber circuits of the plurality of snubber circuits, the summing circuit arranged to sum voltages induced in each of the induction coils in the plurality of induction coils.

Abstract: A method for producing a coil assembly includes overlaying printed circuit traces on a core. The traces include terminals for coupling to conductive connections on a base on which the coil assembly is to be mounted. Two or more wires are wrapped around the core so as to define two or more coils, wrapped in different, respective directions. The ends of the wires are coupled to the printed circuit traces, so as to connect the wires through the traces to the terminals.

Abstract: A metal detector is disclosed which comprises a transmitter arranged to generate a primary magnetic field, and at least one sensor arranged so as to sense a secondary magnetic field vector present after the transmitter has been turned off by measuring 3 substantially mutually orthogonal components of the secondary magnetic field. Each sensor is of a type arranged to sense a time-varying magnetic field.

Abstract: The present invention provides a sensor in which an offset problem of the sensor can be solved, that is, a current sensor, a magnetic field sensor, a magnetic bridge that is formed by a magnetic fluid suitably used in the current sensor and the magnetic field sensor, and a magnetic path casing that forms the magnetic fluid whose form is unfixed into a required morphologic magnetic bridge. The magnetic bridge includes a magnetic circuit in which two separated circular magnetic paths mr1 and mr2 are connected by connection magnetic paths cr1 and cr2 made of magnetic materials, the circular magnetic paths mr1 and mr2 being formed by retaining a shape of a magnetic fluid with a container 11, and excitation coils L1 and L2 that are driven by excitation driving means while wound on the connection magnetic paths cr1 and cr2.

Abstract: A method for producing a coil assembly includes overlaying printed circuit traces on a core. The traces include terminals for coupling to conductive connections on a base on which the coil assembly is to be mounted. Two or more wires are wrapped around the core so as to define two or more coils, wrapped in different, respective directions. The ends of the wires are coupled to the printed circuit traces, so as to connect the wires through the traces to the terminals.

Abstract: A system for and method of determining and compensating for the effect of a field influencing object on a field sensor, preferably a coil, that is within a navigational domain. The system includes a first and second transmitter to create signals. A signal processor is able to process the created signals. The method can include determining interference and/or a correct signal based on the two signals. Also, a shield can be provided to limit transmission of selected fields.

Abstract: A coil arrangement for a magnetic sensor for detecting metallic objects in a subgrade, in particular structures made of concrete, brick, and wood, as well as a method for energizing and reading out this coil arrangement, is disclosed. The coil arrangement includes one or preferably two stacked outer main coils via which a perpendicular magnetomotive force of the subgrade is effected. Provided within the outer main coil(s) is, on the one hand, a quartet of a total of two pairs of parallel coils lying symmetrical to the axis of the main coil(s), via which a magnetomotive force penetration of the subgrade in two directions parallel to the subgrade surface is possible. To further improve the accuracy and reliability of localizing objects and estimating depth of cover, two pairs of smaller orthogonal coils each opposite from one another and also arranged symmetrically to the axis of the main coil(s) are provided.

Abstract: A detection system comprising a plurality of magnetic field generators and a plurality of magnetic field detectors located adjacent to a detection area, and a control system arranged to generate magnetic field using the generators, and, for each of the generators, to make measurements of the magnetic field generated using each of the detectors, and processing means arranged to process the measurements to generate a data set characterising the detection area.

Abstract: A magnetic detection element with increased detection intensity of a magnetic field by a inspection target substance is provided. A magnetic substance to which an alternating magnetic field is applied, and a detecting coil for detecting a magnetic field received by the magnetic substance are included. A surface of the magnetic substance in the detecting coil is divided into two that are a first region and a second region in a longitudinal direction of the detecting coil, and an affinity with the detection object substance in at least a part of the first region differs from that of the second region.

Abstract: The presently described technology provides a method for simultaneously employing two or more coil architectures in an electromagnetic tracking system. The method includes providing a transmitter that includes three single-coil transmitters, one or more receivers each including three single-coil receivers, and a receiver array that includes a plurality of single-coil receivers; tracking one or more of the single-coil transmitters of the transmitter with respect to the receiver array; and simultaneously tracking one or more of the receivers with respect to the transmitter.

Abstract: A protection device for an oscillating power circuit, namely for a demining coil, such device incorporating circuit breaking means positioned between an alternating current supply network and the power circuit, such device wherein it comprises at least one means to measure and analyze the current supplying the power circuit, means able to detect the appearance of a direct current and connected to triggering means ensuring the opening of the circuit breaking means when the alternating current ceases.

Abstract: A nanometer scale transformer configured to manipulate and detect a magnetic carrier is provided.

Abstract: A toroidal power transformer is disclosed. The toroidal power transformer comprises a circular core composed of plurality of laminated electrically conductive materials, a plurality of multi-layered first windings radially wound around the circular core, said winding arranged with an angular spacing of 2? and a number of windings in each winding layer is less than a number of windings in each previous layer, a multi-layered second winding radially wound around the circular core covering a corresponding one of said plurality of first windings, wherein the layers of each of said second windings are arranged to form a substantially triangular cross-section; and an insulating layer between each of said first and second windings.

Abstract: The present invention provides an axially symmetric vertical magnetic field component sensor system capable of intensifying vertical magnetic field components. The sensor system comprises an axially symmetrical magnetic substance comprising a circular, oval or polygonal shaped flat disk and a protrusion formed on a center of the flat disk. The sensor system is used for a response system having an IC wound by a coil which generates signals and the sensor system is mounted on a metal surface or buried in a hollow formed on the metal surface.

Abstract: A sensor system, which can be embedded in a metal bed or metal face and has a good performance, has been demanded. A sensor system arranged in the following manner fulfills the above-mentioned demand. When the sensor system employs a square bracket shaped magnetic substance core, a magnetic path is formed and a strong magnetic field vertical to the metal face is obtained, even if the square bracket shaped magnetic substance core is embedded in a concave of the metal bed. A strong vertical magnetic field is obtained in the center portion of a combined magnetic substance cores even by using a surface current on the metal face.

Abstract: A magnetic field detector is provided that makes use of Magneto-Impedance in order to switch an oscillator between operating states as a function of magnetic field strengths.

Abstract: An integrated circuit includes a die and a first magnetic field sensitive element formed on the die. The integrated circuit includes a first coil formed on the die and around the first magnetic field sensitive element.

Abstract: A method of manufacturing a sensor module includes providing a substrate comprising an array of magnetically sensitive elements on a first main face of the substrate. An array of conducting lines is applied over the first main face of the substrate. An array of electrical interconnects is applied over the first main face of the substrate. The substrate is singulated after application of the electrical interconnects.

Abstract: A magnetic sensor array includes a first three-dimensional magnetic sensor secured to a substrate in a central location of the substrate. A number of second three-dimensional magnetic sensors are secured to the substrate at a first distance from the first magnetic sensor. Additionally, a number of one-dimensional magnetic sensors are secured to the substrate at a second distance from the first magnetic sensor greater than the first distance. Additional magnetic sensors of any dimension may also be included. The magnetic field sensitivity of the first and second three-dimensional magnetic sensors may be less than the magnetic field sensitivity of the one-dimensional magnetic sensors. The sensing range of the first and second three-dimensional magnetic sensors may be greater than the sensing range of the one-dimensional magnetic sensors. The magnetic sensor array may also include a processing circuit coupled to the magnetic sensors.

Abstract: A device to test the good working order of a magnetic field generator, and namely a demining coil, such device comprising at least one evaluation means for the magnetic field coupled with at least one display means, device wherein said evaluation means comprise at least one wound coil able to be positioned so that the lines of the magnetic field pass through it, said wound coil linked to evaluation electronics powered by said wound coil itself.

Abstract: A flaw detection apparatus includes a coil for producing an alternating-current magnetic field for flowing eddy currents in a magnetic material; a magneto-optical element disposed at the center of an inner peripheral portion of the coil and having a reflective film at an end face thereof opposed to the face of the member to be flaw-detected; an optical fiber for entering light from a light source into the magneto-optical element toward the reflective film via a circulator; an optical fiber for entering reflected light reflected by the reflective film into an analyzer via the circulator; a photoelectric conversion element for converting output light of the analyzer into an electrical signal; and a computing device for processing an output signal of the photoelectric conversion element and detecting a flaw of the member to be flaw-detected, based on the rotation angle of the plane of polarization of the reflected light.

Abstract: The present invention relates to the field of orientation measurement by a magnetic field generating apparatus and a magnetic field receiver apparatus by using one or more coils, respectively. Said coils transmit or receive at least one magnetic field being modulated by a frequency, respectively; thereby said apparatus provides a specific arrangement to said coils like e.g. a planar one to determine the relative orientation of said apparatus to each other.

Abstract: A device (16) used to measure at least one component of a magnetic field, includes a magnetoresistive sensor (102) and a measuring chain (28). The input of the measuring chain is connected to the magnetoresistive sensor (102), while the output thereof is intended to supply information that is representative of the magnetic field in the region of the sensor. In addition, the measuring chain (28) includes elements (136) for isolating a frequency component of the signal from the sensor representative of the magnetic field for a unique pre-determined frequency (FI).

Abstract: Provided is an electromagnetic coil arrangement comprising a set of electromagnetic sensors at fixed locations with respect to each other, each of the electromagnetic sensors comprising a planar coil coupled to a conductive layer, the planar coil comprising non-concentric rings. Further, provided is an electromagnetic tracking system, comprising an electromagnetic coil arrangement, at least one complementary electromagnetic sensor and a processor configured to process a signal comprising data indicative of a mutual inductance between the at least one complementary electromagnetic sensor and each of the set of the electromagnetic sensors of the electromagnetic coil arrangement. Also, provided are a method of tracking and a method of manufacturing an electromagnetic coil arrangement.

Abstract: A magnetic-field-measuring probe includes at least two magnetoresistive sensors which are sensitive to respective magnetic fields along a determined measurement axis. The at least two magnetoresistive sensors are rigidly connected to one another in a position such that the measurement axes thereof are at an angle other than zero. Output terminals specific to each magnetoresistive sensor are used to supply a signal that is representative of the field measured by each sensor along the measurement axis thereof. The difference between the derivative of a first magnetic field relative to a second direction and the derivative of a second magnetic field relative to a first direction is calculated to determine a component of current to be measured.

Abstract: A proximity sensor 717 comprising a combination of an arbitrarily selected one of a plurality of types of detection end modules 707, a plurality of types of output circuit modules 709 and a plurality of types of outer shell cases 711. The detection end module 707 includes an integrated arrangement having a detection coil assembly (705, 701, 702) with the detection characteristic self-completed by a mask conductor 700 for reducing the conductor detection sensitivity in a specific peripheral area where the outer shell case is assumed to exist, and a detection circuit assembly (703) with the coil of the detection coil assembly as a resonance circuit element. The characteristics of the proximity sensor are completely adjusted before shipment. As a result, the adjustment of the characteristics which otherwise might be required each time is eliminated even in the case of the combination with an outer shell case of a different material.

Abstract: A method is described herein that can be used to detect the presence of a load coil within a transmission line. The method can also be used to determine the number of load coil(s) present within the transmission line. In addition, the method can be used to determine the distance to the first load coil.

Abstract: A system and method for measuring volumes and areas using electromagnetic induction techniques. A current is generated and fed into one of two coil assemblies to induce voltage into another coil assembly to provide accurate values for volume or area.

Abstract: A magnetic element in a flat-plate shape includes a linearly-extending first flat plate being made of one of a magnetic material and a conductive material and a helical second flat plate being made of the other of the magnetic material and the conductive material, and the first flat plate is inserted into the helical structure of the second flat plate so as to alternatively weave front and back surfaces of the second flat plate.

Abstract: Two coil forming elements (12, 14) formed of conductor layers and a contact means (19), which is formed in an interlayer dielectric film (13) interposed between the conductor layers and brings the upper and lower coil forming elements into contact with each other through a via hole form a stacked coil (10). One end of the stacked coil is connected to an upper grounding layer (27) of a strip line (20), and the other end of the stacked coil is connected to a strip conductor (23) of the strip line. The number of turns of the stacked coil is larger than 1. A magnetic flux penetrating through the stacked coil increases to be able to induce a relatively large electromotive force. Thus, a high spatial resolution can be obtained easily.

Abstract: A magnetic field sensor for measuring at least two components of a magnetic field comprises a ferromagnetic core mounted on a semiconductor chip, an exciter coil to which a current can be applied and two read-out sensors. The ferromagnetic core is ring-shaped. The exciter coil is preferably formed from conductor tracks of the semiconductor chip and from bonding wires.

Abstract: A Lorentz force-driven mechanical resonator apparatus that utilizes a high-Q resonant structure as both a mixing device and a high-Q bandpass filter. Specifically, an external time varying, but quasistatic, magnetic field is applied to the resonating device while simultaneously running a time varying electrical current through the device. The resulting Lorentz force (I×B) is proportional to the vector product of the electrical current in the bar (I) and the external magnetic field (B). Integrating such a resonant device with a magnetic field coil produces the functionality of an ideal radio frequency (RF) mixer coupled with a high-Q intermediate frequency (IF) filter. Wide tunability provides the capability to scan, or even step, an array of filters having very narrow bandwidths via a common local oscillator to a desired frequency range.

Abstract: The present invention provides a device for detecting a magnetic field comprising: a dielectric body; an electrically conductive pattern; and an electrically conductive ground region. The electrically conductive pattern so extends in the dielectric body as to form a dielectric looped face at least partially surrounded by the electrically conductive pattern, and the electrically conductive pattern having a first end electrically connected to an external electrically conductive line and a second end. The electrically conductive ground region is formed in the dielectric body. The electrically conductive ground region is electrically connected to the second end of the electrically conductive pattern and is electrically isolated from other parts of the electrically conductive pattern than the second end, so that the electrically conductive ground region serves as a ground to the electrically conductive pattern.

Abstract: A magnetic field detector is provided that makes use of Magneto-Impedance in order to switch an oscillator between operating states as a function of magnetic field strengths.

Abstract: A magnetic field probe includes a substrate and a conductive layer provided on the substrate. The conductive layer has a coil, lead wires, and pads. The coil has at least one turn and outputs a signal indicative of a magnetic field from a device under test in a vicinity of the magnetic field probe. The lead wires extend from the coil to the pads, the signal from the coil being transmitted to the pads through the lead wires. An isolating layer of a dielectric material is provided on the lead wires to protect the lead wires between the coil and the pads in the conductive layer. A shielding layer of a conductive material is provided on the isolating layer to protect the isolating layer. The shielding layer prevents distortion of the magnetic field at the lead wires in conjunction with the isolating layer.

Abstract: A magnetic pick-up coil for measuring magnetic field with high specific sensitivity, optionally with an electrostatic shield (24), having coupling elements (22) with high winding packing ratio, oriented in multiple directions, and embedded in ceramic material for structural support and electrical insulation. Elements of the coil are constructed from green ceramic sheets (200) and metallic ink deposited on surfaces and in via holes of the ceramic sheets. The ceramic sheets and the metallic ink are co-fired to create a monolithic hard ceramic body (20) with metallized traces embedded in, and placed on exterior surfaces of, the hard ceramic body. The compact and rugged coil can be used in a variety of environments, including hostile conditions involving ultra-high vacuum, high temperatures, nuclear and optical radiation, chemical reactions, and physically demanding surroundings, occurring either individually or in combinations.

Abstract: A magnetic flux detector has a core member and an armature member. The core member generates a magnetic flux by an exciting coil receiving an excitation current controlled by an excitation current controller. The magnetic flux detector also has a search coil provided in a magnetic path for the magnetic flux, and a magnetic flux calculator, which determines the magnitude of the magnetic flux by measuring an electromotive force induced in the search coil by a change in the magnetic flux. The excitation current controller controls the excitation current to increase from zero to a predetermined value during a first predetermined time period and then to decrease to zero during a second predetermined time period. The magnetic flux calculator determines the magnitude of the magnetic flux based on the integrated electromotive forces during the first and second time periods.

Abstract: A magnetic flux detector comprises a core member 12 and an armature member 11, and the core member 12 generates a magnetic flux by an exciting coil 13 when the exciting coil receives an excitation current controlled by an excitation current controller 30. The magnetic flux detector further comprises a search coil 14, which is provided in a magnetic path for the magnetic flux, and a magnetic flux calculator 40, which determines the magnitude of the magnetic flux by measuring an electromotive force induced in the search coil 14 by a change in the magnetic flux. The magnetic flux calculator 40 has a potential setup resistor 43, whose resistance B is sufficiently larger than the internal resistance A of the search coil 14 (approximately A=B/3˜B/30).

Abstract: The present invention is directed to an apparatus and method of increasing the sensitivity of a magnetic sensor embedded in a key fob used in passive keyless entry and identification systems. The sensitivity of the sensor is increased by magnetically coupling a pair of magnetic flux concentrators at opposite ends of the magnetic core of the sensor, which is surrounded by a helical conductive coil. Addition of the magnetic flux concentrators external to the coil effectively forces a larger window of magnetic flux through the coil than was possible without them. This increases the magnetic sensitivity of the coil as a sensor in a time varying magnetic field. In a key fob/passive keyless device this results in an increased range of operation.

Abstract: It is an object of the present invention to provide a magnetic sensor which is suitable to be manufactured in a large amount, has a high sensitivity, and is easy to handle. A first outer layer section A is formed by laminating a plurality of magnetic sheets one upon another. A coil section is formed by laminating a plurality of coil-patterned sheets one upon another. A second outer layer section is formed by laminating a plurality of magnetic sheets one upon another. Each of the sheets forming the coil section B has its central portion formed by an elliptical magnetic body and its surrounding portion formed by a non-magnetic body on which a coil pattern is formed by a film located on the non-magnetic body.

Abstract: A sensor coil is provided on a core which forms a magnetic circuit for driving a linear motor, and the core is excited by electrifying the sensor coil at a high frequency. The high-frequency excitation is carried out in such a manner that the sensor coil is not magnetically saturated, and an eddy current is generated in the core. The impedance of the sensor coil is detected in this state and the quantity of a magnetic flux generated in the core constituting the magnetic circuit is detected on the basis of the impedance. Thus, the influence on the magnetic circuit itself is reduced and higher accuracy, miniaturization and lower power consumption are realized.

Abstract: A system for and method of determining and compensating for the effect of a field influencing object on a field sensor, preferably a coil, that is within a navigational domain. The navigational domain contains navigational magnetic energy and disturbing magnetic energy, and the field influencing object produces the disturbing magnetic energy in response to the navigational magnetic energy. The correction system includes a first transmitter for projecting into the navigational domain field energy in a first waveform sufficient to induce a first signal value in the sensing coil. The system also includes a second transmitter for projecting into the navigational domain field energy in a second waveform sufficient to induce a second signal value in the sensing coil. The system further includes a signal processor for receiving the first signal value and for receiving the second signal value to determine the effect of the electrically conductive object on the field senior.

Abstract: An inductive magnet sensor has two identically wound magnetic antennae connected in series, out of phase, spaced axially from one another, and placed outside and parallel to the axis of a magnetic pipe so that induced noise voltages from the symmetrical noise magnetic flux of the pipe mostly cancel, leaving the responsiveness of the antennae undiminished to sense the non-symmetrical magnetic flux from a permanent magnet or a signal from a transmitter passing through the pipe. The enhanced signal of each of these antennae is then resistively attenuated, one fixed and the other adjustable, to further enhance the cancellation after placement of the sensor outside of the pipe. This balance adjustment improves the signal to noise ratio of the combined signal and the sensor is adjustably resistively attenuated to set the gain to enhance the dynamic range after mounting on the pipe.

Abstract: A compact magnetic field exposure sensor and analysis system suitable for use in the calibration of induction heating processes such as foil cap sealing or the heat treatment of metals. The compact sensor is a self-contained sensing coil, and signal storage, processing and/or transmittingcomponents that can be configured to suit narrow-mouth containers. Detected and/or processed signals can be transmitted to remote storage, processing and/or display subsystems from the sensor.

Abstract: A magnetic field probe includes a substrate and a conductive layer provided on the substrate. The conductive layer has a coil, lead wires, and pads. The coil has at least one turn and outputs a signal indicative of a magnetic field from a device under test in a vicinity of the magnetic field probe. The lead wires extend from the coil to the pads, the signal from the coil being transmitted to the pads through the lead wires. An isolating layer of a dielectric material is provided on the lead wires to protect the lead wires between the coil and the pads in the conductive layer. A shielding layer of a conductive material is provided on the isolating layer to protect the isolating layer. The shielding layer prevents distortion of the magnetic field at the lead wires in conjunction with the isolating layer.

Abstract: A display apparatus of magnetic flux density for detecting an internal crack of a metal or a shape of the metal includes a three-dimensional magnetic flux focusing unit installed near the metal, for concentrating magnetic flux generated by the metal, a magnetic flux density measurement unit installed near the magnetic flux focusing unit, for measuring changes in magnetic flux density concentrated by the magnetic flux focusing unit, and a display unit electrically connected with the magnetic flux measurement unit, for real-time displaying and storing changes in the magnetic flux density.

Abstract: A simple and compact method and apparatus for detecting high frequency electric fields, particularly in the frequency range of 1 MHz to 100 MHz, uses a compact toroidal antenna. For typical geophysical applications the sensor will be used to detect electric fields for a wide range of spectrum starting from about 1 MHz, in particular in the frequency range between 1 to 100 MHz, to detect small objects in the upper few meters of the ground. Time-varying magnetic fields associated with time-varying electric fields induce an emf (voltage) in a toroidal coil. The electric field at the center of (and perpendicular to the plane of) the toroid is shown to be linearly related to this induced voltage. By measuring the voltage across a toroidal coil one can easily and accurately determine the electric field.

Abstract: A vacuum diode with a high saturation current density and a rapid response time for the detection of electromagnetic radiation. This diode comprises a grid (6) in the shape of a cylinder and a photo-cathode (4) which extends along the axis (X) of the cylinder. The photo-cathode includes a part of the internal conductor of a coaxial cable (8), the external conductor and the electrically insulating material of the coaxial cable being removed opposite this part, and the grid is electrically connected to the external conductor of this coaxial cable, the internal and external conductors being coaxial. Application to the detection of visible, infra-red, ultra-violet and X radiation.

Abstract: A magnetic field sensor has a first conductor, a first insulating film, a second conductor, a second insulating film and a third conductor. The first conductor is composed of a “C-shaped” portion, which is formed in a C-like shape, and a linear portion, which is connected to one side of the “C-shaped” portion which is opposite to a gap of the “C-shaped” portion. The first insulating film is formed on the first conductor and has a hole in a predetermined position. The second conductor is formed in a ladle-like shape, and is formed on the first insulating film such that its one side corresponding to the front end of the ladle overlaps with a straight line, through which an outer edge of one end and an outer edge of the other end of the “C-shaped” portion.