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| Number | Title | Issue Date |
| 7750629 | Measuring electric and magnetic field A field detection device such as a micro-strip portion of a transmission line may detect an electric field and a magnetic field induced by current steps injected into the chassis coupled to a ground plane. The shield portions of the transmission line may be coupled ... | 07/06/2010 |
| 7323870 | Magnetoresistive sensor element and method of assembling magnetic field sensor elements with on-wafer functional test A method of performing an on-wafer function testis provided for multiple magnetic field sensor elements on a wafer. Each sensor element includes a magnetic-field-sensitive structure and a current conductor structure. The current conductor structure provides a test m... | 01/29/2008 |
| 7317308 | System and method for measuring electric current in a pipeline A system for measuring a voltage differential in a current-carrying pipe using a propulsion vehicle for conveying the system inside the pipe. The system includes a first contact for maintaining electrical contact with the pipe as the vehicle moves through the pipe, ... | 01/08/2008 |
| 7275865 | Temperature measuring apparatus using change of magnetic field A temperature measuring apparatus measures the temperature of a wafer in real time using a change of magnetic field during a thermal process. The temperature measuring apparatus includes: at least one conductive structure disposed on one surface of the wafer, in whi... | 10/02/2007 |
| 7265516 | Linear electric motor controller and system for providing linear control The invention relates to a method of, and system for, linear speed control for an electric motor, in which a digital to analog converter means is used for converting an 8-bit digital signal to an analog voltage for setting voltage across a motor, a digital state mac... | 09/04/2007 |
| 7145319 | Electrical conductor locating device An electrical conductor locating device comprises a pulse generator and a detector. The pulse generator includes a transformer with outputs for connecting to two positions along the electrical conductor to define a closed loop. The current in the closed loop produce... | 12/05/2006 |
| 7104147 | System and method for measuring electric current in a pipeline A system and method for measuring a voltage differential in a current-carrying pipe using a propulsion vehicle. The system may be adapted for use with a pipeline pig or other propulsion device, which is configured to determine the electric current in a pipeline with... | 09/12/2006 |
| 7097610 | Treatment of afflictions, ailments and diseases A method and apparatus for alleviating or curing human afflictions, ailments and diseases holistically by application of magnetism in such way of bringing the meridian systems into a balance and harmony. A north pole surface of a magnet is applied to a portion of th... | 08/29/2006 |
| 7009391 | High throughput missing pattern detector for servo printed recording media The present invention provides a method for detecting missing servo patterns on printed recording media. In general, the method first comprises the step of generating a map of anticipated servo burst patterns for a magnetic medium. The magnetic medium is typically a... | 03/07/2006 |
| 6984979 | Measurement and control of magnetomotive force in current transformers and other magnetic bodies A magnetic body having nonlinear permeability is influenced by a magnetomotive force, the magnitude of which is to be measured or controlled. An electric energy source is connected to a winding that is magnetically coupled to the magnetic body. The electric energy s... | 01/10/2006 |
| 6977508 | Cable detection apparatus and method A cable detection apparatus is disclosed having a filter, the filter transmitting components of a signal detected substantially at certain harmonics of a first frequency. The filter may also attenuate the signal at certain even harmonics thereof. A method of detecti... | 12/20/2005 |
| 6975111 | METHOD AND DEVICE FOR MEASURING INTENSITY OF ELECTROMAGNETIC FIELD, METHOD AND DEVICE FOR MEASURING CURRENT-VOLTAGE DISTRIBUTION, AND METHOD FOR JUDGING QUALITY OF ELECTRONIC DEVICE, AND ELECTRONIC DEVICE THEREOF A conductor is disposed within an area where electric coupling and magnetic coupling take place between the conductor and a device-under-test (DUT) in at least a portion of frequency band width, and the value of composite currents that is outputted in a plurality of... | 12/13/2005 |
| 6924640 | Oil and gas well tubular inspection system using hall effect sensors An inspection system for detecting flaws in oil and gas well borehole ferromagnetic tubulars. The inspection device operates inside the tubular by first saturating tubular wall with magnetic flux. Flaws in the wall causes flux leakage, and the magnitude of the flux ... | 08/02/2005 |
| 6911826 | Pulsed eddy current sensor probes and inspection methods A pulsed eddy current sensor probe includes a sensor array board. A number of sensors are arranged on the sensor array board and are operable to sense and generate output signals from the transient electromagnetic flux in a part being inspected. Each of the sensors ... | 06/28/2005 |
| 6727695 | Test method and apparatus for noncontact and nondestructive recognition of irregularities in the wall thickness of ferromagnetic pipes An electric current comprising a plurality of harmonic components is passed through the pipe under test, a magnetic field produced by it outside the pipe is measured, a spectrum of the electric current is measured, a spectrum from measured magnetic field data is als... | 04/27/2004 |
| 6683452 | Magnetic flux density apparatus for, E.G., detecting an internal crack of a metal or a shape of the metal 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 ma... | 01/27/2004 |
| 6642739 | Method and device for magnetizing and inspecting a rotor for magneto generators A single apparatus for magnetizing permanent magnet segments mounted on a cylindrical shell for use in a flywheel magneto or the like. Not only are the segments magnetized but also their magnetic strength is measured when the magnetized element is moved o... | 11/04/2003 |
| 6639400 | Method and apparatus for measuring magnetic head In a magnetic head measuring apparatus for measuring a magnetic head, an amplitude-modulated electric current whose amplitude is modulated by a specified carrier wave frequency and modulation frequency is applied to a magnetic head. A calibrating magnetic... | 10/28/2003 |
| 6545468 | Calibration method for magnetically enhanced reactive ion etcher A method of calibrating the magnetic coils of a magnetically enhanced reactive ion etcher includes taking magnetic field measurements outside of a closed plasma chamber and correlating such measurements to the magnetic field within the chamber. One or mor... | 04/08/2003 |
| 6525533 | Current detection switch and apparatus therewith A current detection switch comprising a measured conductor into which a measured current flows, a plurality of magnetoelectric devices placed sandwiching the measured conductor so as to have magneto-sensitive faces on sides to which a magnetic flux genera... | 02/25/2003 |
| 6501266 | Procedure and device for detecting nonuniformities in the wall thickness of inaccessible metal pipes The invention concerns a testing procedure for detecting nonuniformities in the wall thickness of inaccessible metallic pipes in which electrical alternating currents of different frequencies are passed through the pipe and the magnetic fields generated b... | 12/31/2002 |
| 6429661 | Fault indicator for three-phase sheathed cable A fault indicator for three phase sheathed cables includes a flexible collar unit which fits over the cable. Magnetic pole pieces within the collar unit having associated magnetic windings are aligned with the three conductors within the cable to produce ... | 08/06/2002 |
| 6366085 | Probe device for measuring a magnetic field vector A method and a measuring device for determining the spatial distribution of a magnetic field vector. At least a pair of sensor elements is provided. Each sensor element measures a component of the magnetic field vector. The sensor elements are aligned in ... | 04/02/2002 |
| 6326783 | Method of measuring axially symmetric electromagnetic fields Disclosed is a method of measuring axially symmetric magnetic fields. According to this method, an electric field generator or magnetic field generator for generating axially symmetric electric fields or magnetic fields is placed on a rotator. The rotator... | 12/04/2001 |
| 6307382 | Device and method for magnetically sensing current in plate structure A device (16) for sensing current flowing in a generally flat plate structure (10) contains a magnetic head (18) and signal processing circuitry (20). The magnetic head (a) senses changes in current-induced magnetic flux as the head is positioned over the... | 10/23/2001 |
| 6281697 | Semiconductor device evaluation apparatus A semiconductor device evaluation apparatus is provided with a test board. A print wiring is provided at a first surface of the test board on which a semiconductor device is mounted. A terminal of the semiconductor device is connected to the print wiring.... | 08/28/2001 |
| 6271751 | Magnetic lock and status detection system and method therefor An electromagnetic lock and status detection system and method therefor includes an armature, an electromagnet, and a status detection unit. The electromagnet is magnetically attracted to the armature into a mating relationship. A relatively high inductan... | 08/07/2001 |
| 6261439 | Cathodic protection system for mitigating stray electric current effects A cathodic protection system utilizes dynamic control of an output from a power supply to vary an impressed current applied to a structure to be protected proportional to a measurement of stray electrical current. The current is also supplied to an anode ... | 07/17/2001 |
| 6215303 | Wire detection system A SQUID (Superconducting Quantum Interference Device) magnetometer, by far the most sensitive means for detecting small magnetic field variations, is utilized to detect defects inadvertently produced in the manufacture and draw-down of wires. Detection is... | 04/10/2001 |
| 5943632 | Method and apparatus for detecting and displaying irregularities in ferrous pipe An apparatus for detecting irregularities in a ferrous pipe includes a magnetizing coil for inducing a magnetic field in the ferrous pipe. Inspection sensors measure changes in the induced magnetic field and produce signals representative of those changes... | 08/24/1999 |
| 5929624 | Method and apparatus for detecting electric cables A method of detecting the presence of an electric cable, the electric cable including conductive armoring and a conductive core that is electrically insulated from the armoring. In the method, the armoring is connected to ground, and a current pulse is em... | 07/27/1999 |
| 5834938 | Nondestructive inspection apparatus with superconducting magnetic sensor To provide a nondestructive inspection apparatus with a reduced distance between a superconducting magnetic sensor and an object under inspection, a cryostat for cooling the sensor to a superconducting state is provided with inner and outer vessels. The i... | 11/10/1998 |
| 5757056 | Multiple magnetic tunnel structures A double tunnel junction is disclosed that can be used as a magnetic sensor or as random access memories. The preferred embodiment comprises three magnetic metal materials separated by two insulating layers. A current is passed through the first tunnel ju... | 05/26/1998 |
| 5754044 | Magnetooptic system for article defects and flaws detection A magnetooptic device to be used in industrial applications to investigate articles for flaws or defects. The magnetooptic device is capable of revealing defects in articles of nonmagnetic and magnetic conducting material. These results are achieved by de... | 05/19/1998 |
| 5747998 | Apparatus for detecting anomalies in pipes An apparatus and method for detecting anomalies in ferrous pipe structures is presented. An electrical current is passed through the ferrous pipe structure so as to create a magnetic field in the pipe. A sensor having one or more sensor shoe members is pl... | 05/05/1998 |
| 5671740 | Method and apparatus for deducing bioelectric current sources A method and apparatus for deducing physical quantities such as positions, sizes and orientations of bioelectric current sources. Minute magnetic fields formed by the bioelectric current sources in a region under examination of an examinee are measured wi... | 09/30/1997 |
| 5671155 | Method and apparatus for detecting and displaying irregularities in ferrous pipe An apparatus for detecting irregularities in a ferrous pipe includes a magnetizing coil for inducing a magnetic field in the ferrous pipe. Inspection shoes measure changes in the induced magnetic field and produce signals representative of those changes. ... | 09/23/1997 |
| 5572123 | Apparatus and method for on-line inspection of electrically conductive food products using liquid electrolyte Inclusions such as encysted parasites and spoilage in food products such as fish fillets are detected by immersing the food products in a bath of an electrolyte, such as a saline solution, having substantially the same electrical conductivity as the uncon... | 11/05/1996 |
| 5479100 | Method for detecting anomalies in pipes An apparatus and method for detecting anomalies in ferrous pipe structures is presented. An electrical current is passed through the ferrous pipe structure so as to create a magnetic field in the pipe. A sensor having one or more sensor shoe members is pl... | 12/26/1995 |
| 5437058 | Wireless shipboard data coupler The wireless shipboard data coupler allows transmission of data through steel ship bulkheads and submarine pressure hulls without the need for special wiring penetrations. Shipboard sensing data with a 1.0 MHz current is injected into the steel plating ad... | 07/25/1995 |
