Class / Patent application number | Description | Number of patent applications / Date published |
324232000 | Plural magnetic fields in material | 19 |
20080278153 | Systems for Measuring Magnetostriction in Magnetoresistive Elements - A system for use when measuring a magnetostriction value of a magnetoresistive element according to one embodiment includes a mechanism for applying a first magnetic field about parallel to a substrate having one or more magnetoresistive elements, and for applying a second magnetic field about perpendicular to the substrate and about parallel to magnetoresistive layers of the elements; and a mechanism for applying a mechanical stress to the substrate during application of the magnetic fields. | 11-13-2008 |
20080309330 | MAGNETIC PARTICLE IMAGING APPARATUS, METHOD OF DISPOSING DETECTION COIL FOR MAGNETIC PARTICLE IMAGING APPARATUS, AND MAGNETIC FLUX DETECTING APPARATUS - In a magnetic particle imaging apparatus that forms an image of a distribution of magnetic particles based on changes in a magnetic flux generated by magnetization of the magnetic particles, modulation coils that magnetize magnetic particles present in a field free area by applying a modulation magnetic field to the field free area, and detection coils are disposed such as to suppress an influence caused by a magnetic flux of the modulation magnetic field applied by the modulation coils and included in a detected magnetic flux. | 12-18-2008 |
20090309588 | SYSTEM AND METHODS FOR ACTUATION ON MAGNETORESISTIVE SENSORS - The present invention relates to systems and methods for magnetic actuation of particles from and toward the surface of a sensor with a magneto-resistive element. The orientation of magnetic fields and arrangement of magnetic field generating means with respect to the sensor maintains or restores the sensitivity of the magneto-resistive element after actuation. | 12-17-2009 |
20100188076 | MICROELECTRONIC SENSOR DEVICE WITH MAGNETIC FIELD GENERATOR AND CARRIER - The invention relates to a microelectronic sensor device for manipulating a sample in an exchangeable carrier ( | 07-29-2010 |
20110273170 | Method and Apparatus for a Non Contact Metal Sensing Device - A method for detecting metal in an inner region of a caster mould during a casting process using a plurality of eddy current probe assemblies, wherein each of the plurality of eddy current probe assemblies is configured to generate a primary magnetic field passing through nonconductive mould material of the casting mould to the inner region of the casting mould and to provide a signal indicative of a detected secondary magnetic field caused by eddy currents induced in the metal. | 11-10-2011 |
20130076348 | EDDY CURRENT SENSOR AND EDDY CURRENT MEASUREMENT METHOD - An eddy current sensor that includes: a probe and a computing unit. The probe has an exciting portion and a detecting portion. The exciting portion includes a first excitation coil that is wound around a non-magnetic bobbin so that a center axis direction is oriented in an x-axis direction and a second excitation coil that is wound around the non-magnetic bobbin to intersect with the first excitation coil so that a center axis direction is oriented in a y-axis direction. The detecting portion includes a detection coil that is arranged at the lower one of two intersecting portions of the first excitation coil and the second excitation coil. An eddy current measurement method for determining the thickness of a hardened layer. | 03-28-2013 |
20130134968 | Detection of a Metal or Magnetic Object - A measuring device configured to detect a metal object includes two emission coils configured to produce superimposed magnetic fields. The measuring device also includes a device configured to determine a differential voltage between the emission coils. The measuring device further includes a control device configured to supply the emission coils with alternating voltages such that the value of an AC voltage component of the differential voltage, which is time synchronized with the alternating voltage, is minimized. The control device is configured to detect the metal object when the ratio of the alternating voltages does not correspond to the ratio of the impedances of the emission coils when the metal object is not there. | 05-30-2013 |
20130181701 | NONDESTRUCTIVE INSPECTION APPARATUS AND METHOD FOR EVALUATING COLD WORKING EFFECTIVENESS AT FASTENER HOLES - A nondestructive evaluation apparatus and method for qualifying cold worked fastener holes. In an illustrative embodiment, the apparatus comprises a probe and a detector that interprets probe signals. An inductive sensor coil located in the probe uses a magnetic shielding arrangement to focus sensing to a specific zone of cold worked material around a hole in a test specimen. The shielding mitigates edge effects around the hole and measurement dilution away from the hole. A reference coil, located on not cold worked material away from the hole, provides a comparative baseline measurement. Sensor coils are arranged in a novel resonant filter bridge circuit in the probe and connected to the detector. The detector evaluates impedance changes on the probe caused electrical conductivity variations in the test specimen and correlates the changes to cold work quality. | 07-18-2013 |
20130193959 | Detection of a Metal or Magnetic Object - A measuring device for detecting a metal object includes two emission coils configured to produce superimposed magnetic fields, a receiving coil in the region of both magnetic fields, and a control device configured to control the emission coils such that a value of a voltage, which is clock synchronized with alternating voltages and which is induced in the emission coils, is minimized. The control device is configured to detect the metal object when a ratio of the alternating voltages does not correspond to a ratio of distances between the receiving coils and the emission coils. | 08-01-2013 |
20130207648 | Detection of a Metal or a Magnetic Object - A measuring apparatus for detecting a metal object includes two emission coils, a magnetoresistive measuring device, and a control device. The emission coils are configured to produce superimposed magnetic fields. The magnetoresistive measuring device is in the region of both magnetic fields, and is configured to emit an output signal which is dependent on the magnetic field. The control device is configured to supply the emission coils with alternating voltages such that the value of the alternating voltage component of the output signal, which is time synchronized with the alternating voltages, is minimized. The control device is further configured to detect the object when the ratio of the alternating voltages does not correspond to the distances between the magnetoresistive measuring device and the emission coils. | 08-15-2013 |
20130241541 | Eddy Current Inspection Device, Eddy Current Inspection Probe, and Eddy Current Inspection Method - Provided is an eddy current inspection device, an eddy current inspection probe and an eddy current inspection method that make it possible to detect defects existing in deeper parts of test objects. Three or more odd number of excitation coils are arranged at even intervals in a circumferential direction on a postulated circumference. Excitation currents applied to the excitation coils are controlled so that the phase difference between excitation currents applied to adjacent ones of the excitation coils arranged in the circumferential direction on the postulated circumference equals one cycle divided by the number of excitation coils. A magnetic field generated according to an eddy current occurring in the test object due to a magnetic field caused by the application of the excitation currents to the excitation coils is detected by use of a detector arranged on a postulated plane containing the postulated circumference but inside the postulated circumference. | 09-19-2013 |
20130314080 | QUALITY CONTROL OF DIAMAGNETIC MATERIALS USING MAGNETIC LEVITATION - The ability to levitate and detect height and orientation of diamagnetic objects suspended in paramagnetic solutions using an inhomogeneous magnetic field is described. By comparing the measured height and orientation of a sample material with the measured height and orientation of a reference material, quality control of objects can be carried out. The major advantages of this quality control technique are: i) it is a simple apparatus that does not require electric power (a set of permanent magnets and gravity are sufficient for the diamagnetic separation and collection system to work); ii) it is compatible with simple optical detection; iii) it is a cost-effective and simple method that can carry out quality control between sample and reference materials rapidly. | 11-28-2013 |
20140159712 | SYSTEMS AND METHODS FOR MAGNETIC MATERIAL IMAGING - Magnetic material imaging (MMI) system including first and second sets of field-generating coils. Each of the field-generating coils of the first and second sets has an elongated segment that extends along an imaging axis of the medical imaging system. The imaging axis extends through a region-of-interest (ROI) of an object. The elongated segments of the first set of field-generating coils are positioned opposite the elongated segments of the second set of field-generating coils and the ROI is located between the first and second sets of field-generating coils. The MMI system also includes a coil-control module configured to control a flow of current through the first and second sets of field-generating coils to generate a selection field and to generate a drive field. The selection and drive fields combine to form a movable 1D field free region (FFR) that extends through the ROI. | 06-12-2014 |
20140191751 | MAGNETIC TESTING METHOD AND APPARATUS - A magnetic testing method and apparatus can accurately detect a flaw by magnetizing a test object to such a degree that the object becomes magnetically saturated while solving the problems of a large magnetizing device is required when only a DC magnetic field is applied and that the test object generates heat when only an AC magnetic field is applied. | 07-10-2014 |
20140218017 | TRANSIENT ELECTROMAGNETIC GEOPHYSICS SYSTEM WITH COOPERATIVE SOURCE(S) - A cooperative source electromagnetic induction (EMI) device includes: a transmitter configured to generate a time-varying primary magnetic field in the vicinity of a target object, which magnetic field inductively couples with the target object to generate a target object secondary magnetic field; and a cooperative source to which the primary magnetic field is also inductively coupled, generating one or more respective cooperative source secondary magnetic fields. The target object and the cooperative source are inductively coupled via the target object secondary magnetic field and the cooperative source secondary magnetic field. The device includes a receiver configured to measure a composite inductive response, which comprises the inductive coupling of the target object and the cooperative source. A data processor executes statistical classifier software to interpret a signature of the target object based upon the measured composite inductive response and identify the target object from the interpreted signature. | 08-07-2014 |
20140266173 | Inspection Device and Method for Inspecting Physical Properties of a Steel Ball by Using Eddy Current - An inspection device and method are capable of inspecting physical properties of a steel ball quickly and precisely by using eddy current. The inspection device includes an inspection passage and an inspector has a plurality of probes located in the inspection passage. Each of the probes can produce a specific magnetic field and detect eddy current change produced by the steel ball when moving through the magnetic field, whereby to produce a signal. Then, the signal will be analyzed by the inspector and converted into physical property data of the steel ball. | 09-18-2014 |
20140306697 | APPARATUS AND METHOD FOR NON-DESTRUCTIVE INSPECTIONS - An apparatus and a method are provided for the inspection of ferromagnetic components using magnetic particles, particularly for in-situ inspection of parts of power plants, with the apparatus including a movable chassis defining a magnetic yoke with a central opening over a surface of the component to be inspected and a discharge nozzle to inject the magnetic particles onto the surface, a magnetic field source for generating a magnetic field on at least part of the surface below the opening and a probe to measure a representation of the spatial distribution of the magnetic particles on the surface. | 10-16-2014 |
20150070005 | MAGNETIC MEASUREMENT DEVICE - A magnetic measurement device which measures coercivity and coercivity distribution in a microregion of a thin plate magnetic sample with high coercivity. A magnetic sample is applied with a magnetic field in a first direction and magnetized, a second magnetic field is applied in a direction opposite to the first, a measuring part scans the sample, measuring magnetic flux leakage due to remnant magnetization in the sample. The intensity of the second magnetic field is gradually increased while the measuring part repeats the measurement to obtain the second magnetic field wherein the magnitude of the leakage from the sample reaches the maximum level, and when a magnetic field equivalent to the coercivity is applied to the sample and about half of the magnetization is reversed, the sample's coercivity is obtained based on the determination that the demagnetizing field Hd reaches the minimum level and the leakage reaches the maximum level. | 03-12-2015 |
20150115944 | Magnetic Sensors - Among other things, the disclosure features a system comprising a sensor, a DC magnetic field source, an AC magnetic field source, and a receiver. The sensor has an aspect ratio of 10:1 or higher and comprises a ferromagnetic material. The ferromagnetic material has a non-linear magnetization response, and the response contains a maximum point of non-linearity. The DC magnetic field source is adjustable for providing a magnetic excitation field to excite a magnetic field within the sensor. The provided magnetic excitation field has a range such that the excited magnetic field within the sensor is near the maximum point of non-linearity. The AC magnetic field source is configured to generate an AC magnetic field to cause the sensor to generate even harmonics. The receiver is configured to receive the even harmonics from the sensor for determining a position of the sensor. | 04-30-2015 |