Susceptibility Patents (Class 324/201)
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Patent number: 11733329Abstract: A magnetic resonance (MR) apparatus comprises magnet means for generating a main magnetic field in a sample region, encoding means for generating encoding magnetic fields superimposed to the main magnetic field, RF transmitter means for generating MR radiofrequency fields, driver means for operating said encoding means and RF transmitter means to generate superimposed time dependent encoding fields and radiofrequency fields according to an MR sequence for forming images or spectra; and acquisition means for acquiring an MR signal from said object. The magnet means comprise a primary magnetic field source providing a static magnetic field B0 and at least one secondary magnetic field source providing an adjustable magnetic field B?.Type: GrantFiled: August 1, 2021Date of Patent: August 22, 2023Assignees: UNIVERSITAET ZUERICH, ETH ZURICHInventors: David Brunner, Simon Gross, Klaas Pruessmann
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Patent number: 11456408Abstract: Active-mode sensors are provided, and may be used to detect air, water, and sediment interfaces. Systems and methods for sensing air, water, and sediment are also provided. The sensors are robust and withstand forces due to moving or shifting water and sediment.Type: GrantFiled: January 9, 2020Date of Patent: September 27, 2022Assignee: The United States of America as represented by the Secretary of the NavyInventors: JinHyeong Yoo, Nicholas J. Jones, Rachel N. Jacobs
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Patent number: 11181555Abstract: A current sensing method and a current sensor are provided. The current sensing method includes the steps of: exciting a magnetic core to generate at least one pair of regions having opposite magnetization directions in the magnetic core; providing a current to pass through a sensing region of the magnetic core, so that the magnetic core correspondingly generates a magnetic field change; and sensing the magnetic field change of the magnetic core by a pickup coil wound around the magnetic core to output an output signal corresponding to the current.Type: GrantFiled: April 23, 2019Date of Patent: November 23, 2021Assignee: iSentek Inc.Inventors: Fu-Te Yuan, Yen-Chi Lee, Meng-Huang Lai
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Patent number: 11105771Abstract: A magnetic field generation device (100) includes a first magnet (1), a second magnet (2), and a position adjustment mechanism (5). The second magnet (2), together with the first magnet (1), generates a magnetic field. The position adjustment mechanism (5) adjusts a position of the first magnet (1). The magnetic field generation device (100) controls the value of the product of a magnetic flux density and a magnetic flux density gradient in the magnetic field through the adjustment of the position of the first magnet (1) by the position adjustment mechanism (5).Type: GrantFiled: December 15, 2017Date of Patent: August 31, 2021Assignee: KAWANO Lab. Inc.Inventor: Makoto Kawano
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Patent number: 10705162Abstract: A device for detection of magnetic permeability (?) or, alternatively, relative magnetic permeability (?r) or, alternatively relative magnetic susceptibility (?r-) of a sample is described. The device comprises a sample chamber having at least one opening for introduction of a sample or a sample container holding a sample and an electronic circuit. The device also comprises a coil surrounding said sample chamber, and also an electronic circuit adapted to measure the inductance of said coil. The sample chamber, coil and at least one component of the electronic circuit are placed in a temperature controlled zone. Said at least one component in said electronic circuit is/are selected from the group consisting of capacitors, sensors, precision voltage references, precision regulators, low pass and or high pass filters.Type: GrantFiled: December 1, 2016Date of Patent: July 7, 2020Assignee: LIFEASSAYS ABInventors: Khaled Terike, Filiz Ibraimi
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Patent number: 10650320Abstract: A qubit device includes an elongated thin film uninterrupted by Josephson junctions, a quantum device in electrical contact with a proximal end of the elongated thin film, and a ground plane that is co-planar with the elongated thin film and is in electrical contact with a distal end of the elongated thin film, in which the thin film, the quantum device, and the ground plane comprise a material that is superconducting at a designed operating temperature.Type: GrantFiled: September 30, 2015Date of Patent: May 12, 2020Assignee: Google LLCInventors: Yu Chen, John Martinis, Daniel Thomas Sank, Alireza Shabani Barzegar
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Patent number: 10575738Abstract: In a magnetic field measurement apparatus and a magnetic field measurement method provided herein, a magnetic field from an object is measured by a magnetic sensor group including a plurality of magnetic sensors. Then, an estimated value of a common noise component included in observed quantities of the magnetic sensors of all the channels of the magnetic sensor group is obtained as an external magnetic noise component. Finally the magnetic signal from the object is calculated by subtracting the estimated value from the observed quantity of each of the magnetic sensors.Type: GrantFiled: July 10, 2017Date of Patent: March 3, 2020Assignee: ADVANTEST COPORATIONInventors: Takeshi Tanaka, Yuji Ogata, Yoshiyuki Hata, Toshiaki Hayakawa, Tomoaki Ueda
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Patent number: 10564109Abstract: Provided are systems and methods for shifting core data to account for flaws that include segmenting core data into multiple contiguous core segments defined by breaking points and iteratively assessing and shifting the segments in sequence (from the deepest segment to the shallowest segment) to align the core data of the contiguous core segments with corresponding segments of log data. For each shift of an assessed segment by a given distance the shallower segments of core data are shifted by the given distance. The breaking points used to define contiguous core segments are identified based on image processing of an image of the core, including identification and comparison of Haralick textual feature parameters across different portions of the core image.Type: GrantFiled: August 19, 2019Date of Patent: February 18, 2020Assignee: Saudi Arabian Oil CompanyInventors: Marwah Al Ismail, Mokhles Mezghani, Abdullah Qasem
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Patent number: 10557897Abstract: A non-contact conductivity and magnetic susceptibility meter using a magnetic parallel dipole line (PDL) trap system is provided. In one aspect, a measurement system includes: a PDL trap having a pair of dipole line magnets; and a diamagnetic object levitating above the dipole line magnets, wherein the diamagnetic object is configured to contain a material under test for conductivity and magnetic susceptibility measurement using the measurement system. A method for analyzing a material under test using the present PDL trap-based non-contact measurement system is also provided.Type: GrantFiled: January 19, 2018Date of Patent: February 11, 2020Assignee: International Business Machines CorporationInventors: Oki Gunawan, Hendrik F. Hamann
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Patent number: 10458948Abstract: A magneto-mechanical sensor can be use for paramagnetic gas analysis, in which a test piece has a conductor loop is rotatably held by at least one suspension wire. In order to be able to produce the conductor loop, which is to be electrically connected to the at least one suspension wire, with little manual effort and use a small-sized, light-weight sensor, portions of the conductor loop are applied to the surface of the test piece using a metallization process.Type: GrantFiled: June 20, 2016Date of Patent: October 29, 2019Assignee: ABB SCHWEIZ AGInventors: Thomas Bauer, Anton Hardock, Eginhard Mueller, Sebastian Maurer, Francis Rat, Nico Marquart
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Patent number: 10436858Abstract: An imaging system and method are disclosed. An MR image and measured B0 field map of a target volume in a subject are reconstructed, where the MR image includes one or more bright and/or dark regions. One or more distinctive constituent materials corresponding to the bright regions are identified. Each dark region is iteratively labeled as one or more ambiguous constituent materials. Susceptibility values corresponding to each distinctive and iteratively labeled ambiguous constituent material is assigned. A simulated B0 field map is iteratively generated based on the assigned susceptibility values. A similarity metric is determined between the measured and simulated B0 field maps. Constituent materials are identified in the dark regions based on the similarity metric to ascertain corresponding susceptibility values. The MRI data is corrected based on the assigned and ascertained susceptibility values. A diagnostic assessment of the target volume is determined based on the corrected MRI data.Type: GrantFiled: December 2, 2015Date of Patent: October 8, 2019Assignee: General Electric CompanyInventors: Dattesh Dayanand Shanbhag, Rakesh Mullick, Sheshadri Thiruvenkadam, Florian Wiesinger, Sudhanya Chatterjee, Kevin Matthew Koch
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Patent number: 10408894Abstract: A method and device for determining values of a magnetic field component of a magnetic vector field. A method for determining values of a magnetic field component of a magnetic vector field, comprising: determining first distribution data comprising values of the magnetic field component, for a first predetermined area defined along a predetermined surface; determining second distribution data comprising second values of the component of the magnetic field for a second predetermined area defined along a second predetermined surface, wherein the first and the second predetermined surfaces are parallel; wherein determining second distribution data comprises manipulation of the first distribution data based on making use of intrinsic physical properties of the magnetic field; and associated device.Type: GrantFiled: April 2, 2015Date of Patent: September 10, 2019Assignee: MAGCAM NVInventors: Koen Vervaeke, Lieven Philips
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Patent number: 10401393Abstract: A method of measuring superconducting critical current in persistent mode using superconducting closed loops which allow the persistent current to flow without any joints. This persistent critical current is different than traditional resistive critical current that is the upper limit of the superconducting current carrying capacity, and provides the information about the range of critical current in persistent mode that is more close to applications in MRI, SMES, and Maglev operations. The measurement can be used as a quality control method in the manufacturing process and a piece of crucial information to magnet manufacturers for the design and fabrication of magnet. The superconducting materials include the second generation superconducting wires (coated conductors) based on Rare Earth (RE) Barium Copper Oxide superconducting material (REBa2Cu3O6+x, REBCO), or any other type of superconducting wires that can be manufactured in the form of tape.Type: GrantFiled: June 28, 2017Date of Patent: September 3, 2019Assignee: The United States of America as represented by the Secretary of the ArmyInventors: George A. Levin, Paul N. Barnes, Charles C. Rong
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Patent number: 10197644Abstract: A local transmit coil for a magnetic resonance tomograph is provided. The local transmit coil includes a signal transmission device for signal transmission to the magnetic resonance tomograph, and a transmission antenna for generating a magnetic excitation field. The local transmit coil further includes an evaluation device for monitoring a function of the local transmit coil. The evaluation device is configured to transmit a status signal relating to the local transmit coil via the signal transmission device.Type: GrantFiled: September 15, 2016Date of Patent: February 5, 2019Assignee: Siemens Healthcare GmbHInventors: Nikolaus Demharter, Markus Vester, Volker Weißenberger
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Patent number: 9823312Abstract: An apparatus and a method for indirectly cooling a superconducting quantum interference device (SQUID) are provided. The apparatus includes an outer container extending in a vertical direction; a metallic inner container inserted into the outer container to store a liquid coolant, the metal inner container including a top plate; a SQUID sensor module disposed between a bottom surface of the outer container and a bottom surface of the inner container; a heat transfer pillar adapted to cool the SQUID sensor module, the heat transfer pillar having one end connected to the bottom surface of the inner container and the other end directly or indirectly connected to the SQUID sensor module; a magnetic shield part formed of a superconductor covering a top surface of the SQUID sensor module; and a heat conduction plate being in thermal contact with the other end of the heat transfer pillar.Type: GrantFiled: April 21, 2015Date of Patent: November 21, 2017Assignee: Korea Research Institute of Standards and ScienceInventors: Kwon-Kyu Yu, Yong-Ho Lee, Kiwoong Kim, Hyukchan Kwon, Jin-Mok Kim, Sang-Kil Lee
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Patent number: 9733324Abstract: The Magnetic Resonance Imaging (MRI) system includes a radio-frequency transmitter with multiple transmit channels. The MRI system includes an impedance matching network (320, 1402, 1502, 1602) for matching the radio-frequency transmitter to a remotely adjustable radio-frequency antenna (310, 1504, 1602) with multiple antenna elements (312, 314, 316, 318, 1404). The MRI system includes a processor (336) for controlling the MRI system. The execution of the instructions by the processor causes it to: measure (100, 200) a set of radio-frequency properties (352) of the radio-frequency antenna, calculate (102, 202) a matching network command (354) using the set of radio-frequency properties and a radio frequency model (366), and adjust (104, 204) the impedance matching network by sending the matching network command to the impedance matching network, thereby enabling automatic remote impedance matching.Type: GrantFiled: June 21, 2012Date of Patent: August 15, 2017Assignee: Koninklijke Philips N.V.Inventors: Christian Findeklee, Peter Vernickel
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Patent number: 9395425Abstract: A magnetic susceptibility tomographic device has sensitive magnetic sensors about a measurement volume and AC bias coils for providing magnetic fields within the volume. Sensing circuitry reads the sensors, and a processor executes magnetic susceptibility tomography (MST) routines from memory to divide the measurement volume into voxels, to determine differences between applied and measured field strengths of magnetic fields at each voxel and thereby determines magnetic susceptibility of each voxel, and to construct tomographic images representative of magnetic susceptibility as MST images. Embodiments with SQUID and fluxgate sensors are described. Applications to direct measurement of tissue magnetic susceptibility, and to locating and quantifying tagged magnetic nanoparticles are disclosed, including antibody-tagged nanoparticles for use in cancer diagnosis and treatments, and the retrieval of taggant identification codes from an object.Type: GrantFiled: August 23, 2013Date of Patent: July 19, 2016Assignee: THE TRUSTEES OF DARTMOUTH COLLEGEInventors: Solomon G. Diamond, Broc A. Burke, Bradley W. Ficko
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Patent number: 9360441Abstract: A measurement head is provided for a device for measuring the concentration of at least one gas, in particular oxygen. A gas sample a measurement element (1) is arranged in the region of an opening on a circuit board (11). To convey gas a duct (16, 17) is formed in each of two metal bodies, which surround the measurement element (1) and serve as magnetic poles. During operation of the measurement head the gas sample flows substantially perpendicularly, first through one of the metal bodies (12, 13), and then through the opening (18) on a side of the measurement element (1) facing the opening and emerges again through the other metal body (14, 15).Type: GrantFiled: February 21, 2012Date of Patent: June 7, 2016Assignee: Drägerwerk AG & Co. KGaAInventors: Tobias Heise, Alfred Kelm, Hartmut Stark, Günter Steinert, Peter Dreyer
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Patent number: 8981770Abstract: The present invention relates to an apparatus and a method for void size determination of voids within an object into which an aerosol containing magnetic particles has been introduced, in particular for determining the size of a patient's pulmonary alveoli, said patient having inhaled an aerosol containing magnetic particles To review information concerning the lung structure, it is proposed to use magnetic particle imaging. First and second detection signals are acquired subsequently at different moments in time after introduction of the aerosol containing the magnetic particles into the object, in particular after inhalation of the aerosol by the patient. These detection signals are exploited, in particular the drop in intensity and/or the signal decay time, to get information about the diffusion of the magnetic particles within the voids, in particular alveoli, and to retrieve information therefrom about the size of the voids, in particular alveoli.Type: GrantFiled: July 12, 2010Date of Patent: March 17, 2015Assignee: Koninklijke Philips N.V.Inventor: Bernhard Gleich
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Publication number: 20140368191Abstract: A device for discovering, identification and monitoring, of mechanical flaws in metallic structures is disclosed, based on magneto-graphic/magnetic tomography technique to identify stress-related defects. The device includes registration means that optimized for use with metallic structures of various types, shapes and sizes. Applications include a real-time quality control, monitoring and emergency alarms, as well structural repairs and maintenance work recommendations and planning. Examples of the device implementation include pipes for oil and gas industry monitoring, detection of flaws in rolled products in metallurgical industry, welding quality of heavy duty equipment such as ships, reservoirs. etc. It is especially important for loaded constructions, such as pressured pipes, infrastructure maintenance, nuclear power plant monitoring, bridges, corrosion prevention and environment protection.Type: ApplicationFiled: June 18, 2013Publication date: December 18, 2014Inventors: Valerian GOROSHEVSKIY, Svetlana Kamaeva, Igor Kolesnikov, Leonid Ivlev
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Publication number: 20140357534Abstract: In some embodiments, the present invention pertains to methods of detecting a contamination of an environment by a fracture fluid that comprises magnetic particles. In some embodiments, such methods include: (1) collecting a sample from the environment; and (2) measuring a magnetic susceptibility of the sample in order to detect the presence or absence of the magnetic particles. Further embodiments of the present invention pertain to methods of tracing fracture fluids in a mineral formation. In some embodiments, such methods include: (1) associating the fracture fluids with magnetic particles; (2) introducing the fracture fluids into the mineral formation; and (3) measuring a magnetic susceptibility of the fracture fluids. Additional embodiments of the present invention pertain to fracture fluids containing the aforementioned magnetic particles, the actual magnetic particles, and methods of making said magnetic particles.Type: ApplicationFiled: December 10, 2012Publication date: December 4, 2014Applicants: William Marsh Rice University, University of AlbertaInventors: Andrew Ross Barron, David Keith Potter, Samuel J. Maguire-Boyle, Emil Pena, Lauren Morrow
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Patent number: 8847579Abstract: An apparatus for the measurement of the magnetic susceptibility of a gas mixture comprises: a gas sample chamber (8) adapted to receive the gas mixture; a test body (1) rotatably suspended within the gas sample chamber; magnets (10) within the gas sample chamber; a compact optical system for detecting rotation of the test body (1) including a light source (12), photodetectors (13) arranged to detect a light signal, and a mirror (5) attached to the test body (1). An actuation system is arranged to keep the test body (1) substantially at a null position. The optical system comprises at least one photodetector positioned on each side of the light source. The light source is arranged to emit a light beam towards the test body. The photo detectors are arranged to each detect an edge of a light beam reflected from the mirror.Type: GrantFiled: May 27, 2009Date of Patent: September 30, 2014Assignee: Servomex Group LimitedInventors: Richard P. Kovacich, Colin G. Stocks, Christopher R. Edwards, James D. Hobby
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Patent number: 8797023Abstract: Provided is a coercive-force specifying apparatus capable of creating a demagnetization curve for each divisional area of a coercive-force distributed magnet without breaking the coercive-force distributed magnet and of specifying an average coercive force for each divisional area precisely. A coercive force specifying apparatus of the present invention includes: a yoke including an insertion space into which a coercive-force distributed magnet is to be inserted; a magnetizing coil; a search coil that detects a magnetization change when the magnetic field is applied to the coercive-force distributed magnet; and a tracer that creates a demagnetization curve on a basis of a voltage value generated due to the magnetization change. The end face is provided with two or more loop-shaped thread grooves bored therein, the search coil being provided in each thread groove.Type: GrantFiled: March 7, 2011Date of Patent: August 5, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Masafumi Suzuki, Tomonari Kogure, Mayumi Nakanishi
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Patent number: 8773118Abstract: A magnetometer which includes an elongate reactor in which a sample can be secured in a sample support zone and which is located within a magnetic field space of a magnetic field generator and one or more signal pickup coils. Movement generating means is provided for generating relative movement in a generally linear direction between the reactor and at least one of the magnetic field and pickup coil, preferably by moving the reactor in its length. The magnetometer is characterised in that the reactor is a metal tube having a length which permits its ends to remain external of the signal pickup device during the relative movement.Type: GrantFiled: July 10, 2009Date of Patent: July 8, 2014Assignee: University of Cape TownInventors: Michael Christian Maximilian Claeys, Eric Wilhelmus Josephus Van Steen, Jacobus Lucas Visagie, Jan van de Loosdrecht
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Publication number: 20140159706Abstract: A TEM cell includes an untapered region part configured to have a straight-line structure in which a cross-sectional area of an internal space is constantly maintained, tapered region parts coupled between both sides of the untapered region part and a connection part and each configured to have a tapered structure in which the cross-sectional area of the internal space is reduced toward the connection part, wherein a horizontal length of the tapered region part and a horizontal length of the untapered region part are determined in such a way as to reduce an electromagnetic field component in a direction vertical to a cross section of the untapered region part. The EMS evaluation performance of the TEM cell can be improved because an unnecessary electromagnetic field component can be reduced by designing the horizontal length of the untapered region longer than the horizontal length of the tapered region.Type: ApplicationFiled: August 15, 2013Publication date: June 12, 2014Applicant: Electronics and Telecommunications Research InstituteInventors: Sang Bong JEON, Seung Keun PARK
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Publication number: 20130335064Abstract: Provided is a coercive-force specifying apparatus capable of creating a demagnetization curve for each divisional area of a coercive-force distributed magnet without breaking the coercive-force distributed magnet and of specifying an average coercive force for each divisional area precisely. A coercive force specifying apparatus of the present invention includes: a yoke including an insertion space into which a coercive-force distributed magnet is to be inserted; a magnetizing coil; a search coil that detects a magnetization change when the magnetic field is applied to the coercive-force distributed magnet; and a tracer that creates a demagnetization curve on a basis of a voltage value generated due to the magnetization change. The end face is provided with two or more loop-shaped thread grooves bored therein, the search coil being provided in each thread groove.Type: ApplicationFiled: March 7, 2011Publication date: December 19, 2013Inventors: Masafumi Suzuki, Tomonari Kogure, Mayumi Nakanishi
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Publication number: 20130300401Abstract: A sensor apparatus, in particular a metal sensor, has at least two coils and a magnetic field sensor. The arrangement of coils and magnetic sensor with respect to one another and/or the number of coil turns and/or the winding sense of the coils and/or the coil current is/are selected such that the magnetic field generated by the coils approximately disappears at the location of the magnetic field sensor. A method for detecting objects, in particular a method for finding metal objects, uses at least two coils and a magnetic field sensor, particularly an AMR, GMR or Hall sensor. The arrangement of the coils and the magnetic sensor with respect to one another and/or the number of coil turns and/or the winding sense of the coils and/or the coil current is/are selected such that the magnetic field generated by the coils approximately disappears at the location of the magnetic field sensor.Type: ApplicationFiled: September 21, 2011Publication date: November 14, 2013Applicant: Robert Bosch GmbHInventors: Reiner Krapf, Tobias Zibold, Andrej Albrecht
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Publication number: 20130285648Abstract: The present invention relates to a microfluidic chip for measuring the magnetic susceptibility of a superparamagnetic nanoparticle droplet and a method for measuring magnetic susceptibility using the same. According to the invention, the magnetic susceptibility of a superparamagnetic nanoparticle can be continuously and accurately measured in a flowing fluid using a microfluidic chip including microfluidic channels.Type: ApplicationFiled: April 18, 2013Publication date: October 31, 2013Inventors: CheolGi Kim, IIGyo JEONG, Young-Jae EU, KunWoo KIM, XingHao HU, Brajalal SINHA
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Patent number: 8547086Abstract: There is provided a coercivity performance determination device for a coercivity distribution magnet that is capable of determining, in a short period of time, with precision, and at as low a testing cost as possible, whether or not each part of one coercivity distribution magnet has a coercivity that is equal to or greater than the required coercivity. A coercivity determining device of the present invention comprises: a substantially C-shaped magnetic body; excitation means that generates a magnetic flow in the magnetic body; and a flux meter that measures the residual magnetic flux of the coercivity distribution magnet. Protrusions are provided at corresponding positions on two opposing end faces of the magnetic body, and the coercivity distribution magnet is held between the two protrusions to form an annular magnetic circuit. An external magnetic field generation means is formed by magnetic regions caused by the protrusions and non-magnetic regions comprising the air in the periphery thereof.Type: GrantFiled: August 11, 2010Date of Patent: October 1, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Masafumi Suzuki, Mayumi Nakanishi
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Patent number: 8493062Abstract: According to the present invention, a method for determining coercivity of a coercivity distribution magnet, whereby coercivity of each portion in the coercivity distribution magnet can be determined with good accuracy without, for example, cutting the coercivity distribution magnet into pieces and thus quality assurance can be achieved with good accuracy, is provided.Type: GrantFiled: March 15, 2010Date of Patent: July 23, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Tomonari Kogure, Mayumi Nakanishi
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Patent number: 8485014Abstract: Provided are apparatus and methods for compensation of mechanical imbalance in a measurement apparatus, that provides options for increased accuracy and/or less expensive manufacture of a torsion balance. Orientation measurements are taken and an imbalance torque about the torsion spring's axis of rotation is determined, and used to calculate a compensation. The measurement apparatus of one embodiment includes a test body and a set of magnets for generating a first disturbing force on the test body in response to a paramagnetic gas. A conductor element in the magnetic field receives an electrical current that generates a second opposing force to the test body, under feedback control that varies the current until the test body achieves a balanced null position. The control signal required to achieve the fixed null position is measured.Type: GrantFiled: January 24, 2011Date of Patent: July 16, 2013Assignee: Servomex Group LimitedInventors: Colin Stocks, James Hobby, Martin Lopez, Chris Edwards
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Publication number: 20130141080Abstract: There is provided a coercivity performance determination device for a coercivity distribution magnet that is capable of determining, in a short period of time, with precision, and at as low a testing cost as possible, whether or not each part of one coercivity distribution magnet has a coercivity that is equal to or greater than the required coercivity. A coercivity determining device of the present invention comprises: a substantially C-shaped magnetic body; excitation means that generates a magnetic flow in the magnetic body; and a flux meter that measures the residual magnetic flux of the coercivity distribution magnet. Protrusions are provided at corresponding positions on two opposing end faces of the magnetic body, and the coercivity distribution magnet is held between the two protrusions to form an annular magnetic circuit. An external magnetic field generation means is formed by magnetic regions caused by the protrusions and non-magnetic regions comprising the air in the periphery thereof.Type: ApplicationFiled: August 11, 2010Publication date: June 6, 2013Inventors: Masafumi Suzuki, Mayumi Nakanishi
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Publication number: 20130134964Abstract: The present invention relates to a coil comprising a winding (45). The winding comprises a multi-axial cable with one shielding layer connected to ground.Type: ApplicationFiled: May 20, 2011Publication date: May 30, 2013Applicant: IMEGO ABInventors: Fredrik Ahrentorp, Jakob Blomgren, Christian Jonasson, Andrea Prieto-Astalan, Christer Johansson
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Publication number: 20130024146Abstract: A method of taking a plurality of measurements of the magnetic field using the plurality of sensors; includes assessing the inductive magnetic excitation; and determining the likely distribution of magnetic sources on the surface of the hull by resolving a system of equations derived from modeling the physical phenomena at play, on the basis of the plurality of measurements taken and the assessed inductive magnetic excitation. The model describes the induced magnetic sources as a distribution of dipolar sources and the remanent magnetic sources as a distribution of monopolar sources. A device (6) for determining the magnetization of the hull of a ship for implementing the method is also described.Type: ApplicationFiled: January 7, 2011Publication date: January 24, 2013Applicant: DCNSInventors: Laurent Demilier, Yannick Vuillermet, Olivier Nicolas Chadebec, Jean-Louis Coulomb, Laure-Line Rouve, Gilles Cauffet
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Publication number: 20130002240Abstract: According to the present invention, a method for determining coercivity of a coercivity distribution magnet, whereby coercivity of each portion in the coercivity distribution magnet can be determined with good accuracy without, for example, cutting the coercivity distribution magnet into pieces and thus quality assurance can be achieved with good accuracy, is provided.Type: ApplicationFiled: March 15, 2010Publication date: January 3, 2013Inventors: Tomonari Kogure, Mayumi Nakanishi
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Publication number: 20120245873Abstract: Systems and methods are provided for remotely identifying and classifying materials based on their respective complex permittivity features. Materials of interest to be identified in later inspections are cataloged according to their respective complex permittivity features by applying electromagnetic fields to them and determining their complex permittivity features. That library of features is used to compare field measurements taken during an inspection to determine the presence of a material of interest and to identify it.Type: ApplicationFiled: February 22, 2012Publication date: September 27, 2012Applicant: The MITRE CorporationInventors: Nicholas C. DONNANGELO, Alexander V. MAMISHEV, Walter S. KUKLINSKI
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Patent number: 8275427Abstract: Disclosed herein is a method and system for measuring magnetoelectric susceptibility. The system includes a magnet supplying a DC magnetic bias to a magnetoelectric sample, an AC drive coil applying an AC magnetic field to the magnetoelectric sample, a charge amplifier amplifying an electric charge signal of the magnetoelectric sample oscillating by the AC magnetic field, and a phase sensitive detector detecting the voltage signal produced by the charge amplifier while supplying induction current to the AC drive coil. Accordingly, it is possible to provide a highly sensitive system for measuring magnetoelectric susceptibility, which is essential for research on multiferroic and magnetoelectric bulk and thin film materials at room temperature, and can also operate in the physical property measurement system (PPMS, manufactured by Quantum Design Co., Ltd.) for measurements under low temperature and high magnetic field environments.Type: GrantFiled: October 5, 2007Date of Patent: September 25, 2012Assignee: Seoul National University Industry FoundationInventors: Kee hoon Kim, Yoon seok Oh
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Publication number: 20120194198Abstract: A device and method for determining the state of charge of an object, such as an electrochemical battery cell. The device includes a state of charge sensor having a primary magnet that creates a primary magnetic field, and at least one magnetic field sensing element. The sensitivity axes of the sensing elements are substantially perpendicular to the direction of polarization of the primary magnet. The primary magnet and the sensing elements are placed in the proximity of the object, and magnetic fields resulting from the magnetic susceptibility of the object are measured by the sensing elements. The sensing elements output an electrical signal from which the state of charge of the object can be determined.Type: ApplicationFiled: December 29, 2011Publication date: August 2, 2012Inventor: Timothy MORAN
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Publication number: 20110304322Abstract: An apparatus for the measurement of the magnetic susceptibility of a gas mixture comprises: a gas sample chamber (8) adapted to receive the gas mixture, and a test body (1) rotatably suspended within the gas sample chamber; means (10) for creating an inhomogeneous magnetic field within the gas sample chamber; means for detecting rotational motion of the test (body 1), comprising a compact optical system including a light source (12) and photodetectors (13) arranged to detect a light signal indicative of the rotational motion; and an actuation system (4) arranged to keep the test body (1) substantially at a null position determined by said optical system, wherein the optical system comprises at least one photodetector (13) positioned on either side of the plane which is normal to the mirror and parallel with the rotation axis of the test body, having the light source (12) positioned in the plane.Type: ApplicationFiled: November 19, 2009Publication date: December 15, 2011Applicant: SERVOMEX GROUP LIMITEDInventors: Richard P. Kovacich, Colin G. Stocks, Christopher R. Edwards, James D. Hobby
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Publication number: 20110142186Abstract: The present invention relates to a method of detecting deposits comprising at least one ferromagnetic material, such as nickel, magnetite or the like, on or near the external wall of a tube, notable in that it comprises at least the following steps of: moving a magnetized source inside the tube in the lengthwise direction using an electric motor, measuring the strength of the current in the electric motor, and determining the position and/or the thickness and/or the volume of the said deposit as a function of the variations in the strength of the current measured in the electric motor. Another subject of the invention is a device implementing the said method.Type: ApplicationFiled: March 15, 2009Publication date: June 16, 2011Inventor: Antoine Gemma
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Publication number: 20110140688Abstract: A device for measuring alternating current (AC) magnetic susceptibility and the method for measuring the same are provided. The device comprises an AC magnetic susceptibility coil set, a signal capturing unit, and a signal processing unit. The device detects AC magnetic susceptibility signals from under testing particles in the magnetic field with variable AC frequencies, and extracts the AC magnetic susceptibility intensity variation and phase difference and/or the real part and the imaginary part of the AC magnetic susceptibility by the signal processing unit.Type: ApplicationFiled: August 6, 2010Publication date: June 16, 2011Applicant: MAGQU CO., LTD.Inventor: Shieh-Yueh Yang
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Patent number: 7885696Abstract: A method of searching for a material fated to generate an interband phase difference soliton includes the steps of generating an AC in a soliton candidate material, identifying a loss of AC magnetic susceptibility of the siliton candidate material due to a turn and a twist cut of a vortex line and judging whether or not the soliton candidate material is capable of generating soliton.Type: GrantFiled: August 14, 2007Date of Patent: February 8, 2011Assignee: National Institute of Advanced Industrial Science and TechnologyInventors: Yasumoto Tanaka, Adrian Crisan, Akira Iyo
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Patent number: 7785902Abstract: Disclosed is a method of analysis of a mixture of biological and/or chemical components that entails spatially arranging a chosen component attached to magnetic particles, exposing the particles to a magnetic field, and recording a magnetic induction signal, from which the content of the analyte in the mixture is judged; this includes grouping the chosen component in a probe volume, making the magnetic field alternating, pre-setting its spectrum, at least, at two frequencies, and recording the signal at a frequency, which is a linear combination of these frequencies, during the exposure of the magnetic particles to the field.Type: GrantFiled: March 7, 2001Date of Patent: August 31, 2010Assignee: Magnisense Technology LimitedInventors: Petr Ivanovich Nikitin, Petr Mikhailovich Vetoshko
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Patent number: 7732220Abstract: Disclosed is a method of analysis of a mixture of biological and/or chemical components that entails spatially arranging a chosen component attached to magnetic particles, exposing the particles to a magnetic field, and recording a magnetic induction signal, from which the content of the analyte in the mixture is judged; this includes grouping the chosen component in a probe volume, making the magnetic field alternating, pre-setting its spectrum, at least, at two frequencies, and recording the signal at a frequency, which is a linear combination of these frequencies, during the exposure of the magnetic particles to the field.Type: GrantFiled: April 8, 2008Date of Patent: June 8, 2010Assignee: Magnisense Technology LimitedInventors: Petr Ivanovich Nikitin, Petr Mikhailovich Vetoshko
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Publication number: 20100013461Abstract: To provide a magnetic body detector as a means for warning that a magnetic body enters into a room where a strong magnet, such as an MRI diagnostic system, is installed, wherein a magnetic sensor can detect even a small magnetic body without being saturated even in an environment with strong magnetic flux density; and appropriate notification is provided to a user by arithmetic processing for inhibiting the detected value of a magnetic body that does not pass through a gate.Type: ApplicationFiled: October 15, 2008Publication date: January 21, 2010Applicant: DEED CORPORATIONInventors: Shinichi MASUBUCHI, Hiroshi UCHIDA
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Publication number: 20090270262Abstract: Disclosed herein is a method and system for measuring magnetoelectric susceptibility. The system includes a magnet supplying a DC magnetic bias to a magnetoelectric sample, an AC drive coil applying an AC magnetic field to the magnetoelectric sample, a charge amplifier amplifying an electric charge signal of the magnetoelectric sample oscillating by the AC magnetic field, and a phase sensitive detector detecting the voltage signal produced by the charge amplifier while supplying induction current to the AC drive coil. Accordingly, it is possible to provide a highly sensitive system for measuring magnetoelectric susceptibility, which is essential for research on multiferroic and magnetoelectric bulk and thin film materials at room temperature, and can also operate in the physical property measurement system (PPMS, manufactured by Quantum Design Co., Ltd.) for measurements under low temperature and high magnetic field environments.Type: ApplicationFiled: October 5, 2007Publication date: October 29, 2009Inventors: Kee hoon Kim, Yoon seok Oh
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Publication number: 20090102458Abstract: The invention relates to a method for measuring the magnetic permeability of a magnetic material by measuring the magnetic interaction of an electromagnetic field with this material by using a measuring device including a measuring cell connected through a microwave frequency cable (13) to a vector network analyser (12), said method comprising steps for gauging/calibrating said measuring device, for determining corrective coefficients to be applied to the measurements obtained by means of this device, for verifying the non-drift of this device, these steps being carried out with the help of a reference sample, wherein a reference sample is used, comprising at least one inclusion which enables creation, in a given volume, of a local artificial permeability, each inclusion being achieved by combining at least one inductive component possibly associated with a combination of at last one capacitive and/or resistive and/or active component, the frequency response of the electromagnetic properties of each volume beType: ApplicationFiled: October 20, 2006Publication date: April 23, 2009Applicant: Commissariat A L'Energie AtomiqueInventors: Marc Ledieu, Olivier Acher
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Publication number: 20090085557Abstract: The present invention relates to method and device for detecting changes of a magnetic response of at least one magnetic particle in a carrier fluid. The method comprises: using a measuring procedure comprising measuring the characteristic rotation time of said magnetic particle, said measuring procedure further involving measuring Brownian relaxation in said carrier fluid under influence of an external pulsed excitation magnetic field, and based on said influence of said external pulsed excitation magnetic field measuring a hydrodynamic volume of a particle or a change in a hydrodynamic volume of the particle change upon modification of an effective volume of the particle or its interaction with said carrier fluid by detecting change of magnetization of the particle with time by monitoring change of an output signal in detection coil.Type: ApplicationFiled: October 20, 2008Publication date: April 2, 2009Inventors: Anatol Krozer, Christer Johansson, Jakob Blomgren, Karolina Petersson, Dag Ilver, Andrea Prieto-Astalan, Christian Jonasson
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Patent number: 7502640Abstract: Contrast agents incorporating super-paramagnetic iron-oxide (SPIO) nanoparticles have shown promise as a means to visualize labeled cells using MRI. Labeled cells cause significant signal dephasing due to the magnetic field inhomogeneity induced in water molecules near the cell. With the resulting signal void as the means for detection, the particles are behaving as a negative contrast agent, which can suffer from partial-volume effects. Disclosed is a new method for imaging labeled cells with positive contrast. Spectrally-selective RF pulses are used to excite and refocus the off-resonance water surrounding the labeled cells so that only the fluid and tissue immediately adjacent to the labeled cells are visible in the image. Phantom, in vitro, and in vivo experiments show the feasibility of the new method. A significant linear correlation (r=0.87, p<0.005) between the estimated number of cells and the signal has been observed.Type: GrantFiled: May 18, 2004Date of Patent: March 10, 2009Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Steven M. Conolly, Charles H. Cunningham
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Publication number: 20080272766Abstract: An inductive sensor is provided having a housing with a sensing face and a sensing unit arranged in the housing. The sensing unit has an oscillatory circuit with at least one inductive element. The at least one inductive element is arranged proximate to the sensing face of the housing and has an outer surface made of copper or a copper alloy.Type: ApplicationFiled: May 2, 2007Publication date: November 6, 2008Applicant: BALLUFF GmbHInventor: Manfred Jagiella