Class / Patent application number | Description | Number of patent applications / Date published |
324253000 | Saturable core magnetometers | 42 |
20080252289 | Current and Magnetic Field Sensors, Control Method and Magnetic Core For Said Sensors - The invention relates to a magnetic field sensor comprising at least one magnetic core ( | 10-16-2008 |
20080284425 | Metal Detection System and Method - This application describes a system for contraband and weapons detection. The system comprises a coplanar sensor array, electronic drive circuitry, a data acquisition circuit, a video frame grabber, a video camera, and a computer control unit with a control module installed. Properly constructed and aligned, the system allows for the detection of very small magnetic moments, which surround ferromagnetic materials. This ferromagnetic detection allows users to screen personnel for contraband electronic devices and concealed weapons. | 11-20-2008 |
20090195245 | Coupled Fluxgate Magnetometers for DC and Time-Varying Target Magnetic Field Detection - An apparatus for sensing and processing a magnetic flux signal comprising: an odd number of at least three fluxgate modules, a summer, and a processor. Each fluxgate module is configured to generate a module response signal upon receiving the magnetic flux signal. The fluxgate modules are circularly coupled to each other such that only one-way signal flow is allowed between them. The summer is configured to sum the response signals from each fluxgate module into a summed signal. The processor is configured to receive and process the summed signal. | 08-06-2009 |
20090243609 | MAGNETIC SENSOR ELEMENT AND MAGNETIC SENSOR USING THE SAME - The present invention provides a fluxgate magnetic sensor element which includes: a substrate; an exciting pattern which is disposed on the substrate to generate a magnetic field; a magnetic thin film pattern for detection which is disposed adjacent to the exciting pattern; and a detection coil pattern which is disposed adjacent to the magnetic thin film pattern for detection. In the magnetic sensor element, the exciting pattern, the magnetic thin film pattern for detection, and the detection coil pattern are formed on the substrate. Therefore, the magnetic sensor element can be formed into a flat shape. Moreover, since the length of the generated magnetic field is short in a long-axis direction, the size and thickness of the element itself can be reduced. | 10-01-2009 |
20090295384 | Magnetic field sensor and electrical current sensor therewith - A magnetic field sensor comprises a magnetic field sensing cell and a magnetic shield comprising at least two parts separated by an air-gap and surrounding the magnetic field sensing cell positioned in a cavity of the magnetic shield. | 12-03-2009 |
20100039106 | MEMS DEVICE WITH TANDEM FLUX CONCENTRATORS AND METHOD OF MODULATING FLUX - A microelectromechanical modulating magnetic sensor comprising a base; a magnetic transducer associated with the base that provides an output in response to a magnetic field; a pair of movable flux concentrators positioned to move relative to the magnetic transducer; the pair of movable flux concentrators having a region of high flux concentration between the pair of movable flux concentrators; the pair of flux concentrators moving together in tandem with the distance between the pair remaining substantially constant during movement; support structure for supporting the pair of movable flux concentrators; a power source for causing the movable flux concentrators to move at a frequency within a predetermined frequency range; whereby when the pair of movable flux concentrators is in a first position the region of high flux concentration is in a first location, and when the pair of movable flux concentrators is in a second position, the region of high flux concentration is in a second position; such that as the flux concentrators move from the first position to the second position the intensity of the flux sensed by the transducer is modulated as the region of high flux concentration approaches and recedes from the location of the transducer. | 02-18-2010 |
20100213935 | MAGNETIC DETECTION ELEMENT AND DETECTION METHOD - A magnetic detection element, comprises a core composed of a soft magnetic material, a detecting coil for detecting a magnetic field applied to the core, and an exciting coil for applying an alternating magnetic field to the core, wherein the surface of the core is divided into a first region and a second region in the longitudinal direction of the detecting coil, the first region and the second region being different in affinity for a detection object substance. | 08-26-2010 |
20100301852 | ELECTRICAL CURRENT SENSOR - Closed-loop current sensor comprising a magnetic circuit, a magnetic field sensor, and a compensation circuit configured to generate a magnetic field opposing a magnetic field created by an electrical current to be measured flowing in one or more primary conductors ( | 12-02-2010 |
20110050221 | Coil design for miniaturized fluxgate sensors - A system for detecting a magnetic flux includes: a magnetic-flux-generating coil having a first and second excitation-track elements extending essentially parallel to a reference plane; a flux-conducting structure for guiding the produced magnetic flux; and a flux-detecting coil having a first detection-track element for measuring at least a portion of the produced magnetic flux, the first detection-track element extending in a first plane defined by the first and second excitation-track elements between the first and the second excitation-track elements. The projection of the excitation-track elements of the flux-generating coil onto a projection plane extending parallel to the reference plane essentially covers the projection of the flux-conducting structure onto the projection plane, at least in the region of the windings of the flux-generating coil. | 03-03-2011 |
20110050222 | CURRENT SENSOR AND METHOD FOR MANUFACTURING SENSOR MODULE FOR USE IN CURRENT SENSOR - A current sensor for outputting a detection signal corresponding to a current flowing through a bus bar. The current sensor includes a magnetic core that concentrates and amplifies magnetic flux generated by the current near a detection portion of the bus bar. A magnetic detection element detects the magnetic flux concentrated by the magnetic core and outputs an electrical signal corresponding to the detected magnetic flux. A signal processing circuit includes electronic components and processes the electrical signal output from the magnetic detection element to generate the detection signal. A lead frame holds the magnetic detection element and the electronic components. The magnetic detection element, electronic components, and lead frame are combined to form a single sensor module. The current sensor detects the current flowing through the bus bar with the sensor module and outputs the detection signal. | 03-03-2011 |
20110140694 | PERMANENT OR VARIABLE ALTERNATING MAGNETIC FIELD CIRCULATION SENSOR, AND CURRENT SENSOR IMPLEMENTING SUCH A SENSOR - A permanent or variable magnetic field circulation sensor including apparatus for magnetic excitation further including at least one elongated excitation coil extending around an elongated supple magnetic core and including a supple magnetic material with low relative magnetic permeability having a supple or flexible matrix in which magnetic particles are dispersed, an excitation current generation unit coupled to the excitation coil to generate an excitation magnetic field in the core over substantially the entire length of the coil, apparatus for measurement including: at least one magnetic measuring transducer magnetically coupled to the apparatus for magnetic excitation, a measuring unit connected to the magnetic measuring transducer and suitable for providing a measurement of magnetic field circulation in the core. | 06-16-2011 |
20110199080 | BIOSENSOR WITH QUADRUPOLE MAGNETIC ACTUATION SYSTEM - The present invention provides a biosensor comprising means (5) for accommodating a fluid sample having a sensor surface at its bottom and means for detecting particles accumulated at and/or proximate the sensor surface. The biosensor further comprises a quadrupole magnetic unit ( | 08-18-2011 |
20110241665 | Multi-axis Fluxgate Magnetic Sensor - A ring-shaped first ring-shaped magnetic core, a first excitation coil wound on the first ring-shaped magnetic core, two detection coils wound on the first ring-shaped magnetic core in such a manner that respective input axes of the detection coils are orthogonal to each other, two signal detection/feedback units that detect outputs of the detection coils and feed output signals back to the detection coils, and a first excitation circuit that supplies an excitation current to the first excitation coil are provided, a second ring-shaped magnetic core, a compensation coil wound on the second ring-shaped magnetic core, and a compensation signal generation unit that generates, from an output of a detection coil, a compensation current to be applied to the compensation coil, are further provided, and the second ring-shaped magnetic core and the compensation coil are disposed in positions and directions so that a compensation magnetic field created by the compensation coil cancels interference between magnetic fields generated by two detection coils wound on the first ring-shaped magnetic core. | 10-06-2011 |
20120032674 | Current Sensor - This disclosure is directed to current sensing techniques for use within a magnetic current sensor. According to one aspect of the disclosure, a current sensing device includes a magnetic core, and a magnetic field sensor positioned substantially within a cavity formed by an air gap interface of the magnetic core and configured to sense a magnetic field induced by an electrical current that is conducted through a conductor passing through a central opening of the magnetic core. | 02-09-2012 |
20120038360 | CURRENT AND MAGNETIC FIELD SENSORS, CONTROL METHOD AND MAGNETIC CORE FOR SAID SENSORS - The invention relates to a magnetic field sensor including at least one magnetic core ( | 02-16-2012 |
20120146634 | MAGNETIC INDUCTIVE FLOW METER - A magnetically inductive flowmeter having a pressure-resistant housing made of plastic, comprising a measuring unit with a measuring channel of rectangular cross-section which is flown through by the measurement fluid, a channel wall, two opposing magnet poles at the channel wall, an electromagnet with magnet coil and magnet core for generating a magnetic alternating field as well as two opposing measurement electrodes in the channel wall. The magnet poles are punched, bent and folded parts made of electric sheet metal in the form of an elongate strip with mutually distanced surface elements formed thereon. The elongate strip forms a double web after folding. The surface elements form magnet pole surfaces after bending. The double web and the magnet pole surfaces form the magnet pole. The double web is located on the rear side of the magnet pole. | 06-14-2012 |
20120212220 | ELECTRIC JUNCTION BOX AND CURRENT DETECTION DEVICE - An electric junction box includes a current detection device that has a magneto-electric conversion element and a magnetic core with a gap portion where the magneto-electric conversion element is disposed to detect magnetic flux occurring on the magnetic core as a current. The magnetic core has a conductor insertion portion through which the conductor subject to current detection is inserted. The conductor has a terminal portion to be connected to any other members, a round-shaped cross-sectional portion whose cross section perpendicular to an axial direction of the conductor is shaped like a circle and whose cross-sectional diameter is set equal to or less than an inner diameter of the conductor insertion portion, and a thin wall portion whose thickness is set equal to or less than a width size X of the gap portion. | 08-23-2012 |
20120217963 | MAGNETIC CORE, CURRENT SENSOR PROVIDED WITH THE MAGNETIC CORE, AND CURRENT MEASURING METHOD - A magnetic core to be used in a current sensor includes a first open end plane, which has a first element holding hole for holding a magnetoelectric conversion element formed therein, and a second open end plane, which has a second element holding hole for holding the magnetoelectric conversion element formed therein, and which faces the first open end plane. With such configuration, the magnetic core can improve the detection sensitivity of the current sensor. | 08-30-2012 |
20120217964 | CURRENT SENSOR, TABLE TAP WITH CURRENT SENSOR, AND MAGNETIC SUBSTANCE COVER FOR CURRENT SENSOR - A current sensor including: a current bar through which a current flows; a magnetic substance core configured to cover at least a part of the current bar; a magnetic field measurement element that measures a magnetic field generated by the current flowing through the current bar; a substrate to which the magnetic substance core and the magnetic field measurement element are fixed; and a magnetic substance cover that covers the magnetic substance core, and aligns the magnetic substance core by being fixed to the substrate; wherein slits corresponding to a width of the current bar are formed on side surfaces of the magnetic substance cover, and the current bar is aligned with the magnetic substance cover by protruding from the slits. | 08-30-2012 |
20120229134 | CURRENT DETECTION DEVICE - A current detection device including a first sensor part and a second sensor part, arranged in a state where the magnetic flux detection directions are parallel to each other, detection centers of both the sensors and the detected part are on one reference straight line, and a mutual positional relation is fixed, and a current detection device that derives a correction coefficient to correct a change of a separation distance on the reference straight line between a target conductor and the main sensor part based on a detection value index specified based on a ratio of a detection value of the first sensor part to a detection value of the second sensor part, and a current calculation part to calculate the measurement target current based on the detection value of the main sensor part and the correction coefficient. | 09-13-2012 |
20120268114 | CURRENT SENSOR WITH A MAGNETIC CORE - A current sensor is disclosed, with a ring-shaped magnetic core, the core enclosing the primary conductor with the current to be measured, the core having an air-gap containing a sensor element for measuring the magnetic core induction, whereby the cross-sectional area of the air-gap is larger than the cross-sectional area of the core. | 10-25-2012 |
20120313637 | CURRENT DETECTING APPARATUS - The size of a current detecting apparatus is reduced by employing a small magnetic core, and problems caused by excessive heat generation and vibrations of a bass bar are prevented. In a current detecting apparatus, a current detecting bass bar includes a through portion penetrating through a hollow portion of a magnetic core, and plate-shaped terminal portions continuing from both sides of the through portion. The through portion is formed to have a thickness larger than that of the terminal portions. | 12-13-2012 |
20120313638 | MAGNETIC FIELD SENSOR - A magnetic field sensor includes a magnetizable core having a curved surface at least sectionally, a magnetization device for magnetizing the core, and a determination device for determining a magnetic field in the core. | 12-13-2012 |
20130027033 | CURRENT SENSOR ARRANGEMENT - Current sensor arrangement with a primary conductor for conducting a current that is to be measured, at least two magnetic field probes for measuring magnetic fields, and a magnetic core, which has a closed, arbitrarily formed ring structure that encloses the primary conductor, whereby a primary conductor guide for both rectangular and round primary conductors is located in a magnetic core opening that is enclosed by the magnetic core, and whereby the primary conductor guide has a solid body with a round guide opening that is arranged to overlap relative to the magnetic core opening and with a rectangular guide opening that extends over the round guide opening and that is arranged to overlap. | 01-31-2013 |
20130049751 | METHOD AND APPARATUS FOR DETECTING A MAGNETIC CHARACTERISTIC VARIABLE IN A CORE - A technique is provided for detecting a magnetic characteristic variable in particular the magnetic field strength in a section of a core permeated by a magnetic flux. A portion of the magnetic flux is branched off from the core and passed via a magnetic shunt branch, in which at least one non-ferromagnetic gap is formed. A shunt part is disposed in the shunt branch, wherein the magnetic material of the shunt part is not saturated. At least one section of the shunt part is wound with at least one sensor coil in which the branched-off portion of the magnetic flux generates a sensor signal by induction. The magnetic characteristic variable is determined from the branched-off portion of the magnetic flux or a variable derived therefrom using a sensor and evaluation device to which the sensor signal is fed. | 02-28-2013 |
20130147474 | CURRENT DETECTING APPARATUS - In a current detecting apparatus, a container member which constitutes a insulating housing includes an element supporting portion, a connector supporting portion, and a substrate fixing portion. The element supporting portion is formed with a depression to which a magnetism detecting portion of a Hall element is fitted. The connector supporting portion achieves positioning of a body portion of the connector by a fitting structure in three-dimensional directions where a lead terminal of a connector extends in parallel with lead terminals of the Hall element . The substrate fixing portion is a portion where a circuit board is fixed at one point. The body portion of the connector is also fixed to the circuit board with a screw. | 06-13-2013 |
20130169272 | ROLL DETECTION AND SIX DEGREES OF FREEDOM SENSOR ASSEMBLY - A roll-detecting sensor assembly includes a coil extending along and disposed about an axis. The coil comprises one or more portions, with each portion defining a winding angle. At least one of the portions defines a winding angle that is substantially nonzero relative to a line perpendicular to the axis, whereby the projected area of the coil in an applied magnetic field changes as the coil rotates about the axis. As a result, the coil is configured to produce a signal responsive to the magnetic field indicative of the roll of the sensor about the axis. In an embodiment, at least one of the portions defines a winding angle that is at least 2 degrees. In an embodiment, at least one of the portions defines a winding angle that is about 45 degrees. | 07-04-2013 |
20130278252 | ELECTRIC CURRENT MEASUREMENT METHOD - An electric current measurement method is provided with: a first controlling process of sweeping a sensing current in a negative magnetization direction in a condition that a core is saturated magnetically in a positive magnetization direction; a second controlling process of sweeping the sensing current in the positive magnetization direction in a condition that the core is saturated magnetically in the negative magnetization direction; a first specifying process of specifying a value of the sensing current if the core is demagnetized in the first controlling process; a second specifying process of specifying a value of the sensing current if the core is demagnetized in the second controlling process; and a calculating process of calculating a value of a target electric current on the basis of the specified current values, the first and second controlling processes being performed repeatedly. | 10-24-2013 |
20130293226 | ELECTRIC CURRENT SENSOR - Disclosed is an electric current sensor, including a conducting wire, a core having a hole portion mating with the conducting wire and a gap communicating with the hole portion, and a magnetic sensor having a magnetic flux detection part arranged in the gap. | 11-07-2013 |
20140055131 | MAGNETIC FIELD SENSOR - Embodiments of the present invention provide a magnetic field sensor having a first current path, a second current path, a signal generator and an evaluator. The first current path has a first coil area, and the second current path has a second coil area, wherein the first coil area has windings in a first winding direction around a first magnetic core area, and wherein the second coil area has windings in a second winding direction around a second magnetic core area. The signal generator is implemented to provide an excitation current which divides into the first and second current paths. The evaluator is implemented to tap a voltage between the first and second coil areas and to detect an external magnetic field based on the voltage. | 02-27-2014 |
20140077797 | CURRENT SENSOR - A current sensor includes: a current bar through which a current flows; a first cover that covers the current bar and includes a cutout portion formed in at least a part thereof; a magnetic substance core that covers at least parts of the current bar and the first cover and includes a gap; a magnetic field measuring element located in the gap; and a second cover that covers the magnetic substance core and the magnetic field measuring element and at least parts of the current bar and the first cover, and is located so that a side surface thereof engages with the cutout portion of the first cover. | 03-20-2014 |
20140091788 | CURRENT DETECTOR - A current detector includes a magnetic core that is molded by sintering powder made from a magnetic material, and a current detection busbar. The current detection busbar is a conductor including a penetrating portion that penetrates a hole portion of the magnetic core in a first direction in which a current flows, and terminal portions that are in connection with the penetrating portion on both sides in the first direction. The width of the terminal portions is larger than the maximum width of the hole portion, and the minimum width of the cross-sectional contour of the penetrating portion is larger than the thickness of the terminal portions. An insulating casing holds the magnetic core, the current detection busbar, and the Hall element, while keeping them from coming into contact with each other. | 04-03-2014 |
20140184214 | MAGNETIC FIELD SENSOR LINEARIZATION ARCHITECTURE AND METHOD - A method of processing an output signal and a readout circuit for a magnetic field sensor are disclosed. The purpose of the readout circuit is to generate a digital representation of the magnetic field vector strength. It comprises an input stage for receiving an output signal of the magnetic field sensor; an output stage for outputting a digital output signal corresponding to the sensor output signal; and an analog to digital conversion circuit. The analog to digital conversion circuit receives the sensor output signal and performs, in sequence, a fast conversion process for calculating a number of most significant bits of the digital output signal corresponding to the sensor output signal and for generating a compensation signal, and a delta sigma based conversion process for calculating at least one least significant bit of the digital output signal. The compensation signal is fed back to the sensor input for linearization. The delta sigma based conversion takes advantage of oversampling and noise shaping to increase resolution. | 07-03-2014 |
20140210463 | CURRENT SENSOR AND PRINTED CIRCUIT BOARD FOR THIS SENSOR - A printed circuit includes a hole, a stack, one or more first coils, a magnetic core, and a pad. The hole passes through the vertically through the board to receive a conducting wire. The stack comprises metallization layers vertically stacked and separated mechanically from one another by electrically insulating layers. The first coils fulfill functions of a measurement coil and of an excitation coil. Each first coil has turns wound solely around the magnetic core. The magnetic core forms a first magnetic ring surrounding the hole and extending horizontally between metallization layers. Each turn of each first coil is formed by two conducting tracks produced, respectively, in metallization layers situated above and below the first magnetic ring. The pad passes through an insulating layer and passes through an interior of the magnetic ring, electrically linking the two conducting tracks. | 07-31-2014 |
20140285189 | FLUXGATE MAGNETIC-TO-DIGITAL CONVERTER WITH OVERSAMPLING CLOSED LOOP - A fluxgate sensor including a magnetic-to-digital converter (MDC) can be adapted to measure an external magnetic field B | 09-25-2014 |
20150048820 | FLUXGATE MAGNETIC SENSOR READOUT APPARATUS - Compact, low power fluxgate magnetic sensor readout circuits and apparatus are presented in which demodulator or rectifier circuit to modulates a sense signal from the fluxgate sense coil, and the demodulated signal is provided to an amplifier circuit with a transconductance or other amplifier and one or more feedback capacitors connected between the amplifier input and amplifier output to integrate the amplifier output current and provide a voltage output signal indicating the magnetic field sensed by the fluxgate sensor. | 02-19-2015 |
20150316622 | MAGNETISM DETECTION DEVICE - An apparatus for detecting magnetism includes a self-exciting fluxgate type magnetic oscillation sensor in each of three axes perpendicular to one another, the magnetic oscillation sensor includin a magnetism sensor including a core-coil including a core made of a magnetic material and a coil wound around the core, and an operational amplifier circuit causing an AC excitation current to run through the coil to generate an output in accordance with a strength of an external magnetic field applied to the core. An air core coil not wound around a core is arranged in the vicinity of and in parallel with the core-coil of each of the magnetic oscillation sensors arranged in each of the axes. | 11-05-2015 |
20160109533 | INSPECTION CIRCUIT FOR MAGNETIC FIELD DETECTOR, AND INSPECTION METHOD FOR THE SAME - An inspection circuit serves as a pseudo circuit of a flux gate-type magnetic element having an excitation coil and a detection coil and inspects a magnetic field detector that detects a magnetic field based on an output of the magnetic element when detecting an intensity of a stationary magnetic field applied to the magnetic element based on a time-resolved magnetic balance type. The magnetic field detector includes: an excitation signal generation unit, a detection signal comparison unit, a feedback signal conversion unit, a feedback signal adjustment unit, a data signal conversion unit, and an excitation signal adjustment unit. | 04-21-2016 |
20160116550 | INTEGRATED FLUXGATE MAGNETIC SENSOR AND EXCITATION CIRCUITRY - Improved magnetic sensor excitation circuitry is presented for providing a periodic bidirectional excitation waveform to a fluxgate magnetic sensor excitation coil using a bridge circuit connected to the excitation coil and having lower transistors for switched selective connection to a current mirror input transistor to mirror a current provided by pulsed current source, and with integrated filtering to control pulse rise times and slew rate. | 04-28-2016 |
20160154069 | HIGH PERFORMANCE FLUXGATE DEVICE | 06-02-2016 |
20160161571 | FLUXGATE MAGNETIC SENSOR READOUT APPARATUS - Compact, low power fluxgate magnetic sensor readout circuits and apparatus are presented in which demodulator or rectifier circuit to modulates a sense signal from the fluxgate sense coil, and the demodulated signal is provided to an amplifier circuit with a transconductance or other amplifier and one or more feedback capacitors connected between the amplifier input and amplifier output to integrate the amplifier output current and provide a voltage output signal indicating the magnetic field sensed by the fluxgate sensor. | 06-09-2016 |
20170234942 | LAYOUTS FOR INTERLEVEL CRACK PREVENTION IN FLUXGATE TECHNOLOGY MANUFACTURING | 08-17-2017 |