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7583081 |
Magnetostrictive multi-layer sensor for detecting a deformation
A sensor includes a substrate having a mechanically deformable region that is deformable in a direction non-parallel to a surface of the substrate, and a magnetostrictive multi-layer sensor element...
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7533575 |
Quasistatic magnetic and electric field stress/strain gages
Magnetic or electric field sensors are mounted against a material surface and used for stress, strain, and load monitoring of rotating components such as vehicle drive trains. The stationary...
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7471082 |
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...
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7377179 |
System, method, and apparatus for wireless non-powered stress history and fatigue monitoring of a structure
A wireless, non-powered fatigue monitoring sensor uses a piezoelectric element that is attached to the surface of or embedded within a structure to be monitored. When subjected to stress over time,...
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7375513 |
Methods for measuring magnetostriction in magnetoresistive elements
A method for measuring a magnetostriction value of a magnetoresistive element according to one embodiment includes placing a substrate carrying one or more magnetoresistive elements on a fixture;...
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7362096 |
Robust detection of strain with temperature correction
An apparatus ( 10 ) is set forth for measuring a return signal of a magnetostrictive sensor ( 20 ) that detects a force, torque, or pressure. The return signal includes noise, a DC resistance ( 44...
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7348771 |
Method for verifying sensor condition
Sensor condition verification may be performed on electromagnetic sensors and sensor arrays mounted to a material surface. The sensors typically have a periodic winding or electrode structure that...
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7339283 |
Electronic load regulator
An electronic load regulation system for a locomotive may comprise a solid state replacement for existing electro-mechanical load regulators that are used to adjust the excitation current in the...
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7319322 |
Deformation sensor and method for detecting a deformation
A sensor has a substrate having a mechanically deformable region, a magnetostrictive spin-valve sensor element being arranged to detect a mechanical deformation of the mechanically deformable...
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7317314 |
Method for measuring stress/strain using Barkhausen noises
In a method of measuring stress/strain by detecting Barkhausen noise, an exciting/sensing device is arranged at least adjacent to a magnetic or magnetizable element, and passing an increasing...
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7298139 |
Systems and methods for measuring magnetostriction in magnetoresistive elements
A system for directly measuring a magnetostriction value of a magnetoresistive element includes a fixture for receiving a substrate carrying one or more magnetoresistive elements. A magnet assembly...
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7295001 |
Magnetostrictive transducer using tailed patches and apparatus for measuring elastic wave using the magnetostrictive transducer
A magnetostrictive transducer generating a torsional wave in a subject having a predetermined section and measuring a torsional wave propagating in the subject. In the magnetostrictive transducer...
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7259555 |
Method for determining the hardening depth of steel
This publication discloses a method and arrangement for determining the hardening depth of steel or other ferromagnetic substances without breaking the object being measured. According to the...
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7245123 |
Rolling element bearing unit with sensor and hub unit with sensor
A sensor-equipped hub unit comprises a hub unit 1 having a wheel-side raceway member 4 , a body-side raceway member 5 , and two rows of rolling bodies 6 , and a sensor device 2 provided on...
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7230420 |
Magnetoresistive element lifecycle tester with temperature control
A lifecycle analyzer includes a temperature control element for controlling the temperature of a plurality of magnetoresistive (MR) elements, which may be, e.g., in bar, slider, head gimbal...
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7215117 |
Measurement with a magnetic field
Material properties such as stress in a ferromagnetic material may be measured using an electromagnetic probe. While generating an alternating magnetic field in the object, and sensing the...
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7171314 |
Methods and systems for analyzing structural test data
Systems and methods for analyzing structural test data are disclosed. In one embodiment, a method includes applying a sequence of loads to a test article, receiving raw test data indicative of the...
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7161350 |
Method for material property monitoring with perforated, surface mounted sensors
Material condition monitoring may be performed by electromagnetic sensors and sensor arrays mounted to the material surface. The sensors typically have a periodic winding or electrode structure...
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7106055 |
Fabrication of samples having predetermined material conditions
Fabrication of samples having material conditions or damage representative of actual components inspected by nondestructive testing involves sensors placed near or mounted on the material surface,...
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7098658 |
Digital signal conditioning solution for a magnetometer circuit
A fluxgate magnetometer including a fluxgate and a digital processor. The digital processor includes an analog to digital converter for digitizing the back EMF from the fluxgate and a signal...
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7093499 |
Force sensor, strain sensor and methods for measuring same
A force sensor, or a method, determines a force using at least a measured inductance in a coil wherein a quantum tunneling composite is located in a magnetic path created by the coil, is positioned...
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7053606 |
Measurement of residual and thermally-induced stress in a rail
In a railway line, thermally-induced stresses are a factor for both rail breaks and rail buckling. These stresses are in the longitudinal direction. A nondestructive measuring technique enables the...
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7038444 |
System and method for in-line stress measurement by continuous Barkhausen method
A method and system for performing in-line measurement of stresses in pipeline walls by continuous Barkhausen method comprises an inspection pig including permanent or DC electromagnets for...
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7034522 |
Method and apparatus for measuring movement, displacement and/or deformation
A non-contact rotation speed and torque sensing device which uses the natural inhomogeneities in the magnetic properties of a rotating element ( 4 ) to measure movement, displacement and...
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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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6972560 |
Method for detecting a change in permeability of a magnetostrictive object
A method for detecting a change in permeability of a magnetostrictive object due to a change in strain. At least one first coil and at least one second coil are obtained and positioned such that...
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6960911 |
Strain sensor
A strain sensor includes a sensor section having a magnetic material provided on one surface of a conductor, the magnetic material being formed integrally with the conductor and having a magnetic...
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6943546 |
Magnetoresistive element lifecycle tester
A lifecycle analyzer includes a heating element for heating a plurality of magnetoresistive (MR) elements, which maybe, e.g., in bar form. At one location the MR elements are in contact with a...
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6917196 |
Method and apparatus generating and detecting torsional wave inspection of pipes or tubes
A method and apparatus for implementing magnetostrictive sensor techniques for the nondestructive evaluation of pipes or tubes. A magnetostrictive sensor generates guided waves in a pipe or tube,...
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6912921 |
Torque detecting device
A torque detecting device includes an elastic member disposed between an input shaft and an output shaft of a torque transmitting apparatus, first and second resolvers detecting rotational angles...
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6850055 |
Measurement of the variation of a material property with depth in a ferromagnetic material
The variation in properties of a ferromagnetic material with depth below the surface is assessed in a nondestructive fashion using a probe that incorporates an electromagnet. An alternating...
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6727690 |
Test method for determining imminent failure in metals
A method for determining a “safe-operation” point for a metal structural element subjected to repeated loading, the same or different, generating variable levels of strain and residual stress...
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6664783 |
System for measuring magnetostriction employing a plurality of external magnetic field rotation harmonics
A system for measuring the magnetostriction coefficient λ of a sample material applied to a substrate element fixed at one end leaving the other end free to be deflected. An external rotating...
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6657429 |
Material condition assessment with spatially periodic field sensors
Inductive sensors measure the near surface properties of conducting magnetic materials. The sensors generally include parallel winding segments to induce a spatially periodic magnetic field in a...
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6639402 |
Temperature, stress, and corrosive sensing apparatus utilizing harmonic response of magnetically soft sensor element (s)
A temperature sensing apparatus including a sensor element made of a magnetically soft material operatively arranged within a first and second time-varying interrogation magnetic field, the first...
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6617847 |
Sensing device for the non-destructive evaluation of steel structures or components
The present invention relate to a device for the non-destructive evaluation of such structures and components as are in service and which are intended to continue in use for an extended period...
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6583617 |
Barkhausen noise measurement probe with magnetoresistive sensor and cylindrical magnetic shield
A Barkhausen probe includes a magnetizing field generator, a magnetoresistive magnetic field sensor, a direct current power supply for biasing the magnetoresistive magnetic field sensor and signal...
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6579612 |
Magnetostrictive sensor structure
A sensor for measuring magnetostriction of and/or magnetic thin film is constructed by depositing a thin film nonferromagnetic electrically insulating layer followed by a thin film layer of a...
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6448764 |
Method of and apparatus for contactless planarity measurements on ferromagnetic metal strip
A method and apparatus for the contactless determination of planarity and a ferromagnetic metal strip during transit of the strip through a strip-processing line or cold-rolling line. Hysteresis...
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6424149 |
Nondestructive fatigue test method for ferromagnetic construction materials
A nondestructive test method determines the degree of metal fatigue of test ferromagnetic construction materials by quantifying a change in effective stress due to aging of the test materials. The...
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6356077 |
Method of and device for determining a time-dependent gradient of a shock wave in a ferromagnetic element subjected to a percussion load
A method of determining a time-dependent gradient of a shock wave in a percussion or subjected to a percussion load ferromagnetic element and including subjecting the ferromagnetic element to...
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6341534 |
Integrated two-channel torque sensor
A torque sensor having an array of four saturable core magnetic flux detectors arranged in two pairs. Each pair of flux detectors is associated with a pair of magnetoelastic bands. A triangle...
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6311557 |
Magnetically tunable resonance frequency beam utilizing a stress-sensitive film
Methods and apparatus for detecting particular frequencies of vibration utilize a magnetically-tunable beam element having a stress-sensitive coating and means for providing magnetic force to...
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6305229 |
Detecting fatigue from magnetic characteristics
Fatigue in a magnetically sensitive detector element (20, 172) can be evaluated using the expression H∞ log(N). Employing this method, measuring changes in magnetization of the detector element...
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6239593 |
Method and system for detecting and characterizing mechanical damage in pipelines using nonlinear harmonics techniques
A nondestructive method for inspecting steel pipelines for plastically deformed regions caused by mechanical damage to the pipeline. The invention is a method and system that uses nonlinear...
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6133731 |
Method and apparatus for the on-line measurement of the strength of metal cables
A method and an apparatus are provided for measuring the mechanical properties of ferromagnetic, elongated structures, such as cables, through the measurement of Barkhausen signals. The method...
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6127822 |
Adhesive member for forming an adhesive layer between two members and capable of detecting an internal defect in the adhesive layer
An adhesive member is used to bond one member to another member to form an adhesive layer whose internal defection can be detected by utilizing a magneto-mechanical property of a soft magnetic...
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6111405 |
Nondestructive method of quantitatively evaluating degree of plasticity of steel material
In a nondestructive method of quantitatively evaluating a degree of plasticity of ferromagnetic materials, a magnetic field of a surface of a ferromagnetic test body is measured using a magnetic...
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6084404 |
Apparatus and method for on-line barkhausen measurement
Apparatus and method for measuring the Barkhausen signal of a moving magnetic film, ribbon or fiber wherein first and second stationary electromagnet coils are arranged and separated by a distance,...
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6073493 |
Method of diagnosing fatigue life of structural steelwork and a member of steelwork having life diagnostic function
In a method of diagnosing the fatigue life of structural steelwork according to the present invention, a Barkhausen noise measurement is performed under the condition of 5 μm≤d≤1 mm where d is...
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