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7576534 |
System and method to forecast the electrical conductivity of anodes for aluminum production before baking
The system ( 10 ) and the method are used for forecasting the electrical conductivity of an anode ( 12 ) for aluminum production before the anode ( 12 ) is baked. In the system ( 10 ), at least one...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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....
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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5059903 |
Method and apparatus utilizing a magnetic field for detecting degradation of metal material
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...
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H000879 |
Method and device for inspecting circumferentially conducting materials
A device for inspection by eddy current methods of materials exhibiting cumferential conductivity. This device finds application for the inspection of filament-wound carbon fiber reinforced...
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4954777 |
Device for defect testing of non-ferromagnetic test samples and for ferromagnetic inclusions
Detection of both surface defects of a non-ferromagnetic test body as well s the presence of ferromagnetic particles in the test body by inducing eddy currents and D.C. fields in the body. The...
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4881031 |
Eddy current method and apparatus for determining structural defects in a metal object without removing surface films or coatings
In eddy current testing of coated metal objects for corrosion, test values are arranged into fields corresponding to metal object and coating characteristics permitting direct readout of corrosion...
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4827216 |
Differential triple-coil tester for wire rope with periodic lay effect cancellation
An electrical coil driven by an alternating current develops an alternating magnetic field. A segment of a wire-rope specimen is placed next to and on the axis of the coil, but perpendicular to the...
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4808926 |
Eddy current apparatus and method for controlling a rod mill on the basis of faults detected per unit time
Method and apparatus for monitoring a rod mill and flexible wire drawn and annealed from a stiff coil of rod in the rod mill are disclosed. The fault signals provided by an eddy-current tester are...
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4785243 |
Electronically scanned eddy current flaw inspection
Method and apparatus for performing eddy current flaw inspection on workpiece material such as steel bar stock. A drive mechanism propels a workpiece longitudinally along a workpiece path. An array...
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4767986 |
Oscillating transducers for monitoring the surface of elongated objects
A device for measuring or testing of an object, for example rolled wire, a tube, or a billet, to detect surface discontinuities employs a sensing transducer which is oscillated backwards and...
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4758788 |
Metal detector for intake of field chopper
An apparatus for detecting magnetically sensible objects in an object stream longitudinally passing a predetermined location, for instance at the intake end of the conveyor of a field chopper, has...
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4716366 |
Eddy current distance signal apparatus with temperature change compensation means
Eddy current distance measuring apparatus includes a multiplier connected to one secondary coil of a pair of secondary coils in an eddy current sensor. The secondary coil outputs are inputted to a...
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4683430 |
Eddy current flaw detector method and apparatus having a rotatable high permeability flux concentrator encircling a workpiece
Eddy current test apparatus of the type that generates eddy currents in an object and that senses flaws or defects by sensing changes in the induced eddy current. Two differential encircling coils...
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4659991 |
Method and apparatus for magnetically inspecting elongated objects for structural defects
A magnetic device for nondestructively inspecting elongated objects such as wire cables and the like, for loss of metallic cross-section due to abrasion and corrosion and internal defects has...
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4567435 |
Method and apparatus for continuously measuring distance utilizing eddy current and having temperature difference influence elimination
The distance between the tip of a probe and a high-temperature object of measurement is continuously and accurately measured by arranging the probe comprising a primary coil and a pair of secondary...
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4488114 |
Device for non-destructive testing by eddy currents comprising air-gap correction means
Process and device for non-destructive testing or inspection by eddy currents with correction of the air gap effects. A differential measurement and an absolute measurement are performed and the...
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4430615 |
Reflection type probes for eddy current testing instruments
A reflection type probe for an eddy current testing instrument comprises a ferromagnetic core 2, 3 and a driver coil system 8 and a pick-up coil system 9 mounted on the core, the core having four...
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4392523 |
Process and apparatus for controlling the level of a molten metal surface in continuous casting moulds
A process and apparatus for controlling the level of a molten metal surface in a continuous casting mould uses a probe located either in the molten or above the surface of the molten metal. The...
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4347622 |
Signature surveillance of nuclear fuel
Typical nuclear fuel material contains tramp ferromagnetic particles of random size and distribution. Also, selected amounts of paramagnetic or ferromagnetic material can be added at random or at...
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4292589 |
Eddy current method and apparatus for inspecting ferromagnetic tubular members
Casing inspection apparatus and method are disclosed for determining defects and other anomalies in ferromagnetic oil well casing. The inspection apparatus utilizes a pair of coaxial transmitter...
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4270088 |
Method and apparatus for magnetically testing metal tapes
Magnetic flux is induced in the tape by applying a magnetic field to the tape. Where there is a perforation or a crack air gaps are created and magnetic flux radiates outwardly from the tape across...
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