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| Number | Title | Issue Date |
| 8159217 | Method and device with separate emission/reception functions for making eddy current tests on an electrically conducting part A method for making eddy current tests on an electrically conducting part (13), in which a sensor moves above this part, uses separate emission/reception functions. The method includes obtaining a first complex voltage curve at the terminals of a reception wi... | 04/17/2012 |
| 7319334 | Apparatus and method of inspecting breakdown of conducting wire A breakdown inspection apparatus for a wire includes a power supply applying a voltage to the wire and an electric field sensor detecting an electric field generated around the wire by the applied voltage so as for a user to determine according to variation of the e... | 01/15/2008 |
| 7312607 | Eddy current part inspection system At least one measurement coil of an eddy current part inspection system is oriented relative to a track surface so that the longitudinal axis of the magnetic field generated by the at least one measurement coil is skewed relative to the track surface so as to be sub... | 12/25/2007 |
| 7256577 | High frequency rotary eddy current probe device An eddy current detection system configured in accordance with an example embodiment of the invention employs a high frequency rotary eddy current probe that is capable of detecting very shallow surface imperfections, including imperfections originating at scribe li... | 08/14/2007 |
| 7231320 | Extraction of imperfection features through spectral analysis Autonomous non-destructive inspection equipment provides automatic and/or continuous inspection and evaluation of a material under inspection. The inspection equipment preferably comprises at least one detection sensor and at least one detection sensor interface for... | 06/12/2007 |
| 7208971 | Manual probe carriage system and method of using the same A probe support carriage for use during probing an electrical device includes a body, means for supporting and positioning the body, a plurality of flux sensors and a position sensor. The body has a first end and a second end. The plurality of flux sensors are opera... | 04/24/2007 |
| 7160739 | Feedback control of a chemical mechanical polishing device providing manipulation of removal rate profiles A method of controlling surface non-uniformity of a wafer in a polishing operation includes (a) providing a model for a wafer polishing that defines a plurality of regions on a wafer and identifies a wafer material removal rate in a polishing step of a polishing pro... | 01/09/2007 |
| 7132825 | Detection device A device for detecting the displacement of an object comprising a ferromagnetic material, comprises a magnetic circuit generator provided with first and a second cores made of ferromagnetic material and an excitation coil and a measurement coil. The magnetic circuit... | 11/07/2006 |
| 7123030 | Method and apparatus for detecting elevator rope degradation using electrical resistance A method and system for detecting or measuring defects in an elevator rope having electrically conductive tension members, whereby measured electrical resistance in the tension members is indicative of defects. ... | 10/17/2006 |
| 7026811 | Methods and apparatus for eddy current inspection of metallic posts An apparatus for inspecting a metallic post contoured in a single dimension for defects. The apparatus has a clamp having at least one jaw with a surface conforming to the contour to the metallic post. The conforming jaw or jaws also have a plurality of eddy current... | 04/11/2006 |
| 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 |
| 6873152 | Differential sensor apparatus and method for laminated core fault detection A differential probe is scanned along a stator core tooth portion to detect lamination faults. The probe utilizes two magnetic flux injection yokes arranged side-by-side in relatively close proximity, each yoke having two arm portions and two core-tooth flux-injecti... | 03/29/2005 |
| 6710595 | Discretized magnetic field in eddy current probe The directed field array comprises a cylindrical solenoid 10 and a base 20 located transverse the solenoid axis 11. An array of mutually spaced apart posts 24 extends from the base 20 such that the magnetic field 22 passes t... | 03/23/2004 |
| 6441605 | Current sensor for an electrical device A current sensor for an electrical device including a primary circuit in which a primary current flows. A magnetic circuit includes two identical U-shaped elements between which two studs for air gaps are located. A secondary circuit includes two similar ... | 08/27/2002 |
| 6366082 | Method and apparatus for determining properties of a moving web with a differential coil sensor The invention relates to a method and an apparatus for measuring properties of a moving web, a sensor (1) being arranged on a first side of the moving web (7), the sensor comprising a differential coil (3), which comprises at least two coils, and a refere... | 04/02/2002 |
| 6310476 | Eddy current flaw detector This invention prevents the failure of detection for horizontal and oblique lift-offs in a probe for an eddy current flaw detection test. A plurality of probes are provided, and each probe includes four detection coils. Two adjacent eddy current flaw dete... | 10/30/2001 |
| 6018242 | Eddy current probe having four active elements arranged in a quadrilateral An eddy current probe for the nondestructive testing of electrically conductive material parts comprises four identical active elements (10a, 10b, 10c, 10d), at lease in pairs, whose centers are arranged in accordance with a square or a quadrilateral, who... | 01/25/2000 |
| 5982172 | Method of detecting plastic deformation in steel using a differential type magnetic field sensor To provide an effective method of nondestructively and easily judging plasticization of steel used in a real construction. A magnetic sensor 10 is made to scan along the surface of steel to detect a magnetic field caused by a magnetic anisotropy induced b... | 11/09/1999 |
| 5847562 | Thickness gauging of single-layer conductive materials with two-point non linear calibration algorithm A thickness gauging instrument uses a flux focusing eddy current probe and two-point nonlinear calibration algorithm. The instrument is small and portable due to the simple interpretation and operational characteristics of the probe. A nonlinear interpola... | 12/08/1998 |
| 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 |
| 5825182 | Nondestructive testing system using a SQUID In order to enhance the sensitivity of a nondestructive testing system, a pair of superconducting coils are disposed in the same plane such that a current flowing through the respective coils when exposed to a uniform magnetic field cancels out. As a resu... | 10/20/1998 |
| 5825183 | Radial differential squid magnetic flux meter A superconducting loop is formed by two Josephson junctions connected to both ends of a washer coil which serves also as a pick-up coil. The washer coil which is a magnetic field detection portion is constituted by two coils, i.e., a coil having a radius ... | 10/20/1998 |
| 5691640 | Forced balance metal detector Metal detector (1) including an oscillator (10) generates an RF field in the vicinity of the head (2). Two reference signals (13, 14) are generated, one signal (14) being in phase with the oscillator (10) and the other signal (13) being shifted from the o... | 11/25/1997 |
| 5689183 | Electromagnetic-induction type inspection device employing two induction coils connected in opposite phase relation An electromagnetic-induction type inspection device for inspecting a test specimen by placing the specimen in electromagnetic fields produced by exciting coils, detecting induction currents from induction coils set in the electromagnetic fields, and analy... | 11/18/1997 |
| 5648721 | Rotating flux-focusing eddy current probe for flaw detection A flux-focusing electromagnetic sensor which uses a ferromagnetic flux-focusing lens simplifies inspections and increases detectability of fatigue cracks about circular fasteners and other circular inhomogeneities in high conductivity material. The unique... | 07/15/1997 |
| 5633583 | Magnetic telescope with enhanced noise suppression A magnetic telescope utilized to detect flaws in underground articles such as underground piping, implements multiple stages in the form of geometric and electronic configurations to enhance noise suppression. The geometric configuration includes a differ... | 05/27/1997 |
| 5617024 | Flux focusing eddy current probe A flux-focusing electromagnetic sensor which uses a ferromagnetic flux-focusing lens simplifies inspections and increases detectability of fatigue cracks and material loss in high conductivity material. The unique feature of the device is the ferrous shie... | 04/01/1997 |
| 5610518 | Method and apparatus for detecting small magnetizable particles and flaws in nonmagnetic conductors A pair of Hall sensors are symmetrically positioned between the poles of a horseshoe magnet. The Hall sensors are mounted in a plane flush with the ends of the magnet faces, and are located equidistant from the centerline of the magnet. A small magnetic o... | 03/11/1997 |
| 5554933 | Polar coordinates sensor probe for testing material surrounding fastener holes A polar coordinates sensor probe, having a plurality of circularly arranged pick-up poles driven by a rotating magnetic field originating in a hollow toroid core, for detecting the reflected rotating eddy current pattern in material (both ferrous and non-... | 09/10/1996 |
| 5532590 | Apparatus for measuring circuit parameters wherein errors due to transmission lines are prevented A measuring circuit obtains desired characteristic values of a device under test by accurately measuring a voltage and a current. Errors are eliminated that originate from the transmission characteristics of cables used in measurements at high frequencies... | 07/02/1996 |
| 5510709 | Eddy current surface inspection probe for aircraft fastener inspection, and inspection method An eddy current surface inspection array probe and method for detecting cracks and flaws in aircraft skin metal immediately surrounding rivets, without requiring rivet removal or manual scanning. The array probe includes a circular array of small sense co... | 04/23/1996 |
| 5442285 | NDE eddy current sensor for very high scan rate applications in an operating combustion turbine The present invention provides an eddy current sensing device capable of in-situ operation within a high temperature and high vibration environment of a combustion turbine engine. The eddy current sensing device is preferably utilized in an eddy current s... | 08/15/1995 |
| 5412319 | Device to detect disturbances in an electromagnetic field induced by surface faults in a metallic bar or wire rod in movement Device to detect surface faults in a hot metallic bar or wire rod (11) travelling at speeds up to 130 meters per second, the device comprising upstream and/or downstream rough alignment lead-in means (38), in which device are included first coils (29) and... | 05/02/1995 |
| 5371461 | Apparatus and method for compensating for variations in the lift-off of eddy current surface inspection array elements An improved eddy current probe array having means to compensate the entire array for varying different element liftoff, is described. An array consisting of a plurality of sense elements and means for compensating these sense elements is scanned across an... | 12/06/1994 |
| 5365169 | Remote field eddy current flaw detector for metal material including attenuator, adder, phase shiftery and phase comparator The present invention relates to a flaw detector for metal material for maintaining and managing pipelines using a remote field eddy current sensor. An AC signal having a constant level and shifted by predetermined phase angle is added to signals received... | 11/15/1994 |
| 5293119 | Electromagnetic microscope for evaluation of electrically conductive and magnetic materials An instrument for non destructive evaluation (NDE) is called an electromagnetic microscope, formed by superconductive microprobes arrayed in parallel rows. When moved over a test piece, the array generates a scanned image of flaws, stress variations or ch... | 03/08/1994 |
| 5191285 | Speed responsive filtering control system for flaw detection apparatus A system for processing signals produced by magnetic flaw detection apparatus having facility for examining objects in the course of transport thereof at speeds varying from a prescribed slow speed to a prescribed high speed, with transport frequency thus... | 03/02/1993 |
| 5134368 | Apparatus for magnetically detecting degradation of metal material using superconductor sensor system and reference material data comparison On the basis of a finding that a magnetic hysteresis of a metal material, among magnetization characteristics changing with secular degradation of the metal material, shows a clear correspondence with the degree of degradation of the metal material, a cha... | 07/28/1992 |
| 5130653 | Apparatus for detecting surface flaws in cylindrical articles Apparatus for detecting surface flaws in cylindrical articles having central longitudinal axes, including a guide assembly for guiding the cylindrical articles along a displacement path having a central longitudinal axis extending coaxially of the central... | 07/14/1992 |
| 5122743 | Apparatus and method of non-destructively testing ferromagnetic materials including flux density measurement and ambient field cancellation Apparatus for measuring flux density within the surface of a ferromagnetic material (24) includes a probe (10) having an end for location on or adjacent the surface of the material (24), a first sensor at the said end of the probe (10) and capable of prod... | 06/16/1992 |
