Abstract: An electro-magnetic acoustic transducer (EMAT) having an electromagnet array is provided. The electromagnet array includes electromagnets. Each electromagnet includes a magnetic core and a wound coil wrapped around the magnetic core. The electromagnet array generates bias magnetic fields having different patterns when the wound coils are energized differently. For instance, the electromagnet array generates a bias magnetic field having a given pattern, for the EMAT to transmit a first type of ultrasonic wave such as shear-horizontal wave, when the wound coils are energized in a given manner; and generates a bias magnetic field having a different pattern, for the EMAT to transmit a second type of ultrasonic wave such as a Lamb wave, when the wound coils are energized in a different manner.

Abstract: An eddy probe is provided for identifying non-homogeneous objects in a material. The probe includes a power supply, an oscillator to produce electrical excitation powered by said power supply, a plurality of eddy current detectors, each detector measuring eddy current density, a marker disposed adjacent said plurality for indicating a location on the material in response to a maximum of the eddy current density, and a housing for containing the power supply, oscillator, detectors and marker. The plurality can be two or three detectors. The marker can include a drill bit disposed adjacent the detectors, a transmission connecting to the drill bit; and an electric motor connecting to the transmission and powered by the power supply for rotating the drill bit.

Abstract: A current sensor includes at least one primary circuit that is intended to conduct the current to be measured, and a secondary circuit containing at least four Neel-effect® transducers, each having a coil and a superparamagnetic core. The current sensor is designed on the basis of a printed circuit board, the primary circuit including at least two distinct metal tracks that are composed of one and the same metal and connected to one another by a via made of a rivet, of a tube or of an electrolytic deposit of the same metal.

Abstract: A test and measurement instrument, including at least one port configured to receive a signal from a device under test (DUT), the signal including a current signal acquired across a magnetic core of the DUT and a voltage signal acquired across the magnetic core of the DUT, and one or more processors. The one or more processors are configured to determine a hysteresis loop based on the current signal and the voltage signal, determine a magnetic flux of the magnetic core based on the voltage signal and the current signal for a number of sample points for each cycle, and determine a maximum magnetic flux for all cycles and a hysteresis loop cycle that corresponds to the maximum magnetic flux. A display configured to display at least one of the hysteresis loop, the signal received from the DUT, and the hysteresis loop cycle that corresponds to the maximum magnetic flux.

Abstract: A wireless power system may use a wireless power transmitting device to transmit wireless power to a wireless power receiving device. The wireless power transmitting device may transmit wireless power at a wireless power transmission frequency. Wireless power signals at the wireless power transmission frequency can create interference with a sensitive electrical component in the wireless power receiving device when the wireless power transmission frequency lies in a sensitive frequency band associated with the component. Measurement circuitry in the wireless power receiving device can measure the wireless power transmission frequency. In response to determining that the wireless power transmission frequency lies in a sensitive frequency band, the wireless power receiving device may send an in-band wireless power level adjustment request to the wireless power transmitting device. The request causes a frequency adjustment that moves the wireless power transmission frequency out of the sensitive band.

Abstract: A magnetic detector includes permanent magnets that magnetize a wire rope W in the longitudinal direction, and a search coil that detects a change in the cross sectional area of the wire rope W magnetized by the permanent magnets. The magnetic detector is provided so as to surround a part of the wire rope W. Prior to inspection, the magnetic detector is moved back and forth at least three times across an inspection range of the wire rope W. After the magnetic detector is moved back and forth, the change in the cross sectional area, that is, damage to the wire rope W is inspected by using signals outputted from the search coil.

Abstract: System and method for characterizing material condition. The system includes a sensor, impedance instrument and processing unit to collect measurements and assess material properties. A model of the system may be used to enable accurate measurements of multiple material properties. A cylindrical model for an electromagnetic field sensor is disclosed for modeling substantially cylindrically symmetric material systems. Sensor designs and data processing approaches are provided to focus the sensitivity of the sensor to localize material conditions. Improved calibration methods are shown. Sizing algorithms are provided to estimate the size of defects such as cracks and corrosion. Corrective measures are provided where the actual material configuration differs from the data processing assumptions. Methods are provided for use of the system to characterize material condition, and detailed illustration is given for corrosion, stress, weld, heat treat, and mechanical damage assessment.

Abstract: An accumulating conveyor includes upper and lower runs which form upper and lower tracks, reverse sections connecting the upper and lower runs, and a deflecting element connected to a first motor. Endless tension elements engaged with a deflecting element circulate a pallet in the upper and lower runs. A stop element is on the underside of the pallet, and a stopping element is arranged between the upper and lower runs and driven by a second motor. The stopping element has a locking position with the stop element for stopping the pallet and a release position with the stop element for conveying the pallet. The stopping element is guided in sections around the stop element on a curved path during movement from the locking position to the release position to release the pallet for further conveying.

Abstract: A method for producing a vehicle component from a fiber-reinforced plastic including providing a skin panel having an inner side, outer side and mounting portion. The skin panel is a fiber-reinforced thermoplastic material. At least one stiffening component has a connection surface. The stiffening component is a fiber-reinforced thermoplastic material. The stiffening component and skin panel are contacted wherein the connection surface lies on the mounting portion. The method includes areally warming a joining zone so the stiffening component and skin panel are welded together. The joining zone is cooled. A determined geometry of the combination of stiffening component and skin panel is compared with a predefinable geometry. The joining zone is re-warmed, deforming the stiffening component and the skin panel, and the method includes cooling in order to attain the predefinable geometry if the determined geometry deviates from the predefinable geometry.

Abstract: A conforming eddy current testing (ECT) probe for performing eddy current testing when placed on the surface of a test object. An eddy current array is fabricated on a flexible substrate. A shape metal alloy (SMA) piece is manufactured to have an original shape that conforms to the surface of the test object, and then affixed to the substrate. The SMA piece has as much or more flexibility than the substrate, so that it can be manipulated into position. Just prior to testing, the SMA piece is actuated to revert to its original shape.

Abstract: A technique facilitates examination of a tubing string which may comprise coiled tubing or other types of pipe. A sensor is positioned to monitor a pipe for a magnetic flux leakage signal indicating a defect in the pipe. The sensor outputs data on the magnetic flux leakage signal to a data processing system. Correlations between magnetic flux leakage signals and fatigue life of the pipe may be accessed by the data processing system and these correlations may be used to automatically predict a fatigue life of the pipe. Based on the determined fatigue life, an operation with respect to the pipe is selected and such operation may comprise continued normal use, repair, or removal from service.

Abstract: The invention relates to a method for detecting defects of at least one metal wire of a set of metal wires, in particular in a cable, the method including: a step of emitting a high-frequency ultrasound signal around a so-called specific frequency in the metal wire; a step of reflecting said ultrasound signal in the metal wire; and a step of receiving the reflected ultrasound signal. The emitted ultrasound signal enables the energisation of at least one high-frequency wave capable of propagating in a longitudinal direction of the metal wire and having a phase velocity that is slightly higher than a compression volume wave velocity in the metal from which the metal wire is made.

Abstract: In a rope damage diagnostic testing apparatus, an ultrasound applicator generates ultrasonic waves in a wire rope by making the wire rope vibrate due to magnetostriction effect. A detecting element detects changes in a state of propagation of the ultrasonic waves in the wire rope. An excitation coil and the detecting element are disposed in a parallelogram that has as a first opposite side length a length of a portion of the wire rope in which one of the outer layer strands makes one revolution around the wire rope, and that has as a second opposite side length a product of a diameter and number of the outer layer wires that are included in one of the outer layer strands.

Abstract: To perform system level physical connectivity monitoring measurements, a test signal may be generated in an instrument and transmitted down a signal path extending from the instrument to a device. In a static state (high or low), the test signal generator may produce a specified AC impedance at the point where the signal path connects to the instrument for a designated back termination. A response signal resulting from the test signal may be acquired and used to obtain an impedance value and/or reflection coefficient value representative of the signal path and an additional signal path extending from the source of the test signal to the signal path. The measured response may be compared to an expected response to determine a condition of any component(s) in the signal path and/or in the additional signal path. The expected response may be represented by masks (low and high) created during automated test development.

Abstract: Provided are a method and device for detecting arrangement disorder of fibers in a conductive composite material. A coil (7) is disposed at a position at which the coil (7) faces the conductive composite material, and thereby a current can be applied to the conductive composite material. Thus, work or the like for attaching electrodes to the conductive composite material is not required. As a result, the arrangement disorder of the fibers in the conductive composite material can easily be detected. A method for detecting meandering of fibers in a conductive composite material includes a step of disposing a magnetic field sensor (8) at a position at which the magnetic field sensor (8) faces a surface (Sa) of the conductive composite material such that a direction (D) of a magnetosensitive axis is horizontal with the surface (Sa) and is parallel to coil faces (7e).

Abstract: An improved process for evaluating a defect in wellbore casing using a magnetic flux leakage tool is disclosed. According to the disclosed technique, signals recorded using a magnetic flux leakage tool are arranged into a matrix that defines a magnetic flux leakage image, and a defect in the evaluated wellbore casing is identified in the image. A portion of the image in which the defect appears is enhanced using an iterative image enhancement process to determine a geometry of the defect. A characteristic value of the defect is then used in conjunction with a characteristic value-degree of penetration relationship that is specific to the determined geometry in order to determine the degree of penetration of the defect.

Abstract: A configurable transmit/receive multiplexed coil monitoring (CMCM) device is provided having a plurality of dual function I/O connections connectable to a plurality of coils. The CMCM device is configurable to selectively drive AC transmit signals to any of the plurality of dual function I/O connections, while simultaneously monitoring voltage and phase information received as AC voltages at the dual function I/O connections in a multiplexed manner. The CMCM device is further configured such that while a selected I/O connection is selected to receive voltage and phase information from a particular I/O connection, no AC transmit signal can be driven to that selected particular I/O connection. Embodiments may include a multiplexer and one or more receive circuits configured to receive and digitalize received AC signals for processing by a digital signal processor.

Abstract: A method and system for calibrating temperature measurement devices, such as pyrometers, in thermal processing chambers are disclosed. According to the present invention, the system includes a calibrating light source that emits light energy onto a substrate contained in the thermal processing chamber. A light detector then detects the amount of light that is being transmitted through the substrate. The amount of detected light energy is then used to calibrate a temperature measurement device that is used in the system.

Abstract: The present invention provides a surface property inspection method and apparatus for inspecting the surface properties of a test object subjected to two stages of shot peening. The present invention is an apparatus 1 includes an AC power supply, an AC bridge circuit, and an evaluation apparatus. The AC bridge circuit is constituted by a variable resistor, a reference detector and inspection detector. The inspection detector includes a coil wound so as to oppose the surface property inspection area of the test object M; an eddy current is excited in the test object M by supplying AC power to the coil. A pass/fail judgment of the first shot peening can be made by inspecting the surface properties of a test object subjected to a second shot peening only after the second shot peening is completed.

Abstract: Apparatuses and methods for inspecting a section of piping are disclosed. In one example embodiment, an apparatus includes first and second excitation coils, a plurality of magnetometers, and a data acquisition system. The first excitation coils are disposed at a first axial location and are energized and the second excitation coils are disposed at a second axial location and are energized. The plurality of magnetometers are disposed at an axial location between the first and second axial locations and are positioned to detect magnetic fields generated by eddy currents induced in the section of piping by the first and second excitation coils. The data acquisition system is operatively connected to receive output data from the plurality of magnetometers.

Abstract: A tracker used to analyze a desired borepath prior to horizontal directional drilling operations. The tracker analyzes an amount of interference present at a plurality of different frequencies at multiple locations along the borepath and maps a plot of the interference at the different frequencies. The lower the point on the plot, the less interference present at that frequency at the location analyzed. The tracker summarizes the overall interference along the desired borepath for the different frequencies analyzed and will recommend a preferred frequency. An operator may program the beacon prior to boring operations to emit a beacon signal at the preferred frequency. The operator may also tune the tracker to receive the preferred frequency. The tracker and beacon may then communicate during boring operations at the preferred frequency in order to detect the position of the beacon underground relative to the tracker.

Abstract: A device and method of eddy current based nondestructive testing of tubular structures made of electrically conductive materials is disclosed. The device includes a plurality of excitation electromagnets having an axis of symmetry and magnetoresistive sensors having an easy axis for magnetic field sensing; wherein the magnetoresistive sensors are arranged in a circular array on a single plane with the easy axis aligned radially with respect to the circular pattern and wherein the electromagnets are arranged in a circular pattern on both sides of the plane with their axes of symmetry being arranged parallel to the plane and orthogonal to radii of the circular pattern on which the electromagnets are placed.

Abstract: A method is provided that includes setting up a composite material structure under test (SUT) between a transmit coil and a receive coil. The transmit coil is driven with a RF signal over a plurality of frequencies, thereby causing the transmit coil to produce a magnetic field that by magnetic coupling through the SUT induces a voltage in the receive coil. The voltage in the receive coil is measured, and from the voltage, a measurement of attenuation of the RF signal caused by the SUT between the transmit coil and receive coil is produced. And an effective conductivity of the SUT is calculated from the measurement of attenuation.

Abstract: An apparatus and method for detecting magnetic flux leakage in an object. The apparatus includes a frame assembly, a sensor bar and a U shaped magnetic circuit consisting of first and second magnet and steel pieces 44, 46 and 42 connecting the magnets. The sensor bar is connected to the frame assembly and includes a plurality of coils and at least one sensor operatively connected to at least one of the plurality of coils. The first magnet and the second magnets are connected steel pieces and to the frame assembly. They form a U shaped magnetic circuit which is completed by the steel plate being inspected. The sensor bar is placed between the tips of the U shaped magnetic circuit.

Abstract: A method and system for detecting material loss in a tubular. A method includes identifying a radial cross-sectional area of a tubular as having a loss of material in a wall of the tubular. Responsive to the identifying, an amount of voltage offset present in each of a plurality of measurement signals is determined. Each of the measurement signals provides measurement information for an arc section of the wall. For each of the measurement signals, a zero adjusted signal is produced by adjusting the measurement signal to remove the amount of voltage offset over a length of the tubular for which the identifying recognizes the loss of material. An assessment of wall material loss is produced for each arc section of the wall of the tubular based on the zero adjusted signals. An image of the wall of the tubular showing the wall material loss for each arc section is generated.

Abstract: An apparatus and method, directed to measuring permeability of a magnetoelectric sample, are described. The apparatus includes a sample holder configured to present the magnetoelectric sample to a permeability analyzer for measurement of the sample's permeability, and to facilitate application of a DC voltage to the sample in a way that isolates the DC voltage from the permeability analyzer. The described apparatus and method may be used to measure the permeability values associated with the magnetoelectric sample with respect to a range of DC voltages applied to the sample, while protecting the measuring instrumentality from damage from the applied DC voltages.

Abstract: A system comprises one or more first electromagnetic coils configured to generate and direct first excitation signals toward a plurality of casings in a wellbore and receive response signals based on the excitation signals. The system also comprises a magnetic field source configured to generate a static magnetic field in a particular casing of the plurality of casings and a magnetometer configured to receive response signals based on the static magnetic field in the particular casing. The system further comprises one or more processors configured to receive a first response signal from the one or more electromagnetic coils, receive a second response signal from the magnetometer, and determine, based on the first response signal and the second response signal, whether a defect exists in the plurality of casings.

Abstract: A method for locating a transmitter using a receiver which include, but are not limited to the steps of transmitting a plurality of distinctive and orthogonally polarized signals from a transmitter; receiving the transmitted signals at a pair of separated antennas; demodulating the distinctive orthogonal signals received at each of the pair of separated antennas; and determining a direction to the transmitter from the signals received at the pair of antennas.

Abstract: A system includes a magnetostrictive sensor. The magnetostrictive sensor includes a driving coil configured to receive a first driving current and to emit a first magnetic flux portion through a target and a second magnetic flux portion. The magnetostrictive sensor also includes a first sensing coil configured to receive the first magnetic flux portion and to transmit a signal based at least in part on the received first magnetic flux portion. The received first magnetic flux portion is based at least in part on a force on the target. The magnetostrictive sensor further includes a magnetic shield disposed between the driving coil and the first sensing coil. The magnetic shield is configured to reduce the second magnetic flux portion received by the first sensing coil.

Abstract: A magnetic testing apparatus 100 according to the present invention comprises: a first magnetizing device 1 for applying a DC bias magnetic field to a test object P in substantially parallel to the direction in which a flaw F to be detected extends; a second magnetizing device 2 for applying an AC magnetic field to the test object P substantially perpendicularly to the direction in which the flaw F to be detected extends; and a detecting device 3 for detecting leakage flux produced by the magnetization of the test object P accomplished by the first magnetizing device 1 and the second magnetizing device 2.

Abstract: Techniques are described for determining the amount of current flowing through an electrical conductor of an isolation device by measuring the voltage level across the electrical conductor. The isolation device also includes a sensor that provides a measure of the amount of current flowing through the electrical conductor. By using both the voltage level and the sensor to determine the amount of current flowing through the electrical conductor, the techniques provide for verifying the current measurements made by the isolation device. Also, the techniques provide for fast overcurrent protection.

Abstract: A current measuring circuit for redundantly measuring electrical current includes a measuring resistor, a magnetic field sensor, and an evaluation circuit on an evaluation circuit board. The evaluation circuit is used to determine electrical current using the measuring resistor. The magnetic field sensor on the evaluation circuit board and the evaluation circuit board are arranged in direct proximity to the measuring resistor such that the magnetic field sensor is configured to detect the magnetic field from the current-carrying resistor. A battery includes the current measuring circuit and a motor vehicle includes the battery.

Abstract: A MEMS device including a first proof mass, a first magnetized magnetic material disposed partially on a surface of the first proof mass, a first spring anchored to a substrate to support the first proof mass, and a first sensing element coupled to the first proof mass and operable to sense the motion of the first proof mass caused by an ambient acceleration.

Abstract: A sensor comprises primary ferrite members spaced apart from the magnetic field sensor on opposite sides of the magnetic field sensor concentrate or steer an orientation of a magnetic field of the observed signal toward a target area of the magnetic field sensor. A magnetic field sensor senses a direct current signal component or lower frequency component of the observed signal. A first filtering circuit has a high-pass filter response. The first filtering circuit is coupled to the inductor to provide a filtered alternating current signal component. A second filtering circuit has a low-pass filter response. The second filtering circuit coupled to the magnetic field sensor to provide a filtered direct current signal component. A sensor fusion circuit determines an aggregate sensed current based on the filtered alternating current signal component and the filtered direct current signal component.

Abstract: A sensor comprises an inductor for sensing an alternating current signal component of an observed signal. The inductor comprises a substrate, conductive traces associated with different layers of the substrate, and one or more conductive vias for interconnecting the plurality of conductive traces. A magnetic field sensor senses a direct current signal component of the observed signal. A first filtering circuit has a high-pass filter response. The first filtering circuit is coupled to the inductor to provide a filtered alternating current signal component. A second filtering circuit has a low-pass filter response. The second filtering circuit coupled to the magnetic field sensor to provide a filtered direct current signal component. A sensor fusion circuit determines an aggregate sensed current based on the filtered alternating current signal component and the filtered direct current signal component.

Abstract: A method for acquiring at least one signal transmitted via an electric conductor, wherein an electric and/or magnetic field of the conductor is acquired at at least two identical or different positions relative to a longitudinal coordinate of the conductor, thus obtaining two measurement signals corresponding to the respective positions, and the signal transmitted via the conductor is inferred from the measurement signals.

Abstract: The invention relates to a method, a device and a system for preventing false alarms in a theft-preventing system comprising a magnetic field for detecting at least one metal object in a first detection zone and means for determining a time-difference; said method comprising the steps of detecting a first change in a parameter indicative of the magnetic field in said first detection zone; detecting a second change in the parameter indicative of the magnetic field in said first detection zone; determining a time-difference between the detection of said first change in said parameter and the detection of said second change in said parameter; and performing an action based on said time-difference. In this way, false alarms due to a metal detector falsely detecting for example movement of metal-doors in a first detection zone may be reduced/eliminated. Additionally, the false alarms due to an opening and/or closing of a door with metal parts acting as an active tag may be reduced/eliminated.

Abstract: Methods for testing for defects on magnetic media storage disks are provided. One such method includes dividing a surface of a magnetic media disk into a plurality of radial zones, dividing the disk surface into a plurality of concentric zones, thereby forming a preselected number (N) of wedge subsections for each of the concentric zones, scanning the disk surface for defects, counting the defects contained within each of the wedge subsections, summing the defects contained within two or more of the wedge subsections, comparing the summed defects with a preselected threshold, and determining, based on the comparison, a defect type of the disk.

Abstract: An electrodynamic machine shaft slow roll measurement testing and remediation method that can be performed on a partially machined shaft. Upon completion of slow roll tests on a partially machined shaft the manufacturer may complete machining of shafts that successfully meet the test specification. If a partially machined shaft fails the test specification, the manufacturer at its option may attempt to remediate the shaft, so that it successfully meets slow roll specification upon re-testing. Exemplary remediation steps may include further concentricity machining to reduce mechanical runout or shaft treatment, such as by heating and/or quenching to reduce electrical runout. Partially machined shafts that fail slow roll test specifications (with or without remediation efforts) may be scrapped or otherwise recycled without, completing final machining operations.

Abstract: Magnetic field sensor and related techniques can identify passing conditions, failing conditions, and marginal conditions of a sensed object. The magnetic field sensor and techniques can use one or more peak values of a proximity signal representative of proximity of the object, DC offset values of the proximity signal, or threshold values related to an amplitude of a signal representative of the proximity signal to identify the conditions.

Abstract: A method of evaluating the condition of a laminated core of an electric machine including positioning a magnetic flux injection excitation yoke extending between a pair of teeth of the laminated core, and the excitation yoke being wound with an excitation winding defining an electrical circuit for producing a magnetic flux excitation. Power is supplied to an excitation winding wound around the yoke to produce a magnetic flux in the yoke and to form a magnetic circuit through the yoke and the laminated core. A characteristic of the electrical circuit of the excitation winding is measured to identify a fault in the magnetic circuit corresponding to an eddy current between individual laminations in the laminated core.

Abstract: A dynamically self-adjusting sensor is disclosed. In one embodiment, a sample module repeatedly generates an electronic signal related to a characteristic of an environment. A window module receives the electronic signal and provides an average signal for a pre-defined number of the electronic signals. A delta comparator module receives the electronic signal from the sample module and compares the electronic signal with a previously received electronic signal from the sample module to establish a change, wherein an output is generated if the change is greater than or equal to a threshold, the delta comparator module further receives the average signal from the window module and compares the average signal with a previously received average signal from the window module to establish an average change, wherein the output is generated if the change is greater than or equal to a threshold.

Abstract: A method and system for evaluating the condition of a laminated core of an electric machine, and including a first yoke wound with a first winding and having a first pair of arms spanning between a first pair of teeth of the laminated core, and a second yoke wound with a second winding and having a second pair of arms spanning between a second pair of teeth. A power supply provides power to an electrical circuit defined by one of the first and second windings to produce a magnetic flux in the yoke corresponding to the one of the first and second windings and defining an excitation yoke. A monitoring module provides a measurement of a characteristic of an electrical circuit defined by the other one of the first and second windings to identify a fault corresponding to an eddy current between individual laminations in the laminated core.

Abstract: A method for determining the sensitivity of a sensor provides the following steps: a) first and second deflection voltages are applied to first and second electrode systems of the sensor, respectively, and first and second electrostatic forces are exerted on an elastically suspended seismic mass of the sensor by the first and second electrode systems, respectively, and a restoring force is exerted on the mass as a result of the elasticity of the mass, and a force equilibrium is established among the first and second electrostatic forces and the restoring force, and the mass assumes a deflection position characteristic of the force equilibrium, and an output signal characteristic of the force equilibrium and of the deflection position is measured; and b) the sensitivity of the sensor is computed on the basis of the first and second deflection voltages.

Abstract: An eddy current probe assembly suitable for inspecting a test object with longitudinal shape, being passed through the assembly in the object's axial direction during an inspection session, the probe assembly comprising multiple probe modules being disposed in a radial plane and with the modules partially overlaying on each other forming an iris structure encircling an inspection zone, wherein a movement in unison of each of the probe modules closer to or further away from the center of the inspection zone makes the inspection zone enlarged or contracted. Spring tension is applied on each of the probe modules so that constant life-off in maintained between the probe modules and the test surface. Array of eddy current elements for each probe module and multiple layers of probe modules can be employed to achieve complete coverage of the test surface. The radial cross-sectional shapes of the test objects can be of round or polygonal.

Abstract: This method for detecting a disturber of magnetic field amplitude comprises: the emitting (62) of several magnetic fields of different frequencies from a same uniaxial magnetic field source, the amplitudes of the magnetic field emitted at two different unspecified frequencies being related to each other by a predetermined ratio, the measurement (64) of the amplitude of these magnetic fields at different frequencies by means of a same sensor, and the reporting (70) of an amplitude disturber if a ratio between two of said measured amplitudes diverges from a predetermined threshold of the predetermined ratio which relates the amplitudes of the magnetic fields emitted at the same frequencies and, if not, the absence of any reporting

Abstract: To provide a magnetic body detector as a means for warning that a magnetic body enters into a room where a strong magnet, such as an MRI diagnostic system, is installed, wherein a magnetic sensor can detect even a small magnetic body without being saturated even in an environment with strong magnetic flux density; and appropriate notification is provided to a user by arithmetic processing for inhibiting the detected value of a magnetic body that does not pass through a gate.

Abstract: An electrical/magnetic current sensing system includes a first collection mechanism configured to convert an electric field into surface charge, a second collection mechanism comprising a magnetic reactive material, and a sensor coupled to the first and second collection mechanisms. The sensor comprises an odd number, greater than or equal to three, of unidirectionally-coupled non-linear over-damped bi-stable elements. Each element comprises a resistive load, an operational transconductance amplifier (OTA) with a bipolar junction transistor differential pair, a cross-coupled OTA, and a non-linear OTA. Each element may comprise fully differential inputs and outputs. The sensor may be contained in a microchip or on a printed circuit board. A resident time difference readout device may be connected to the sensor, and may be configured to perform a power spectral density calculation. The sensor may include a resistance to voltage circuit connected between the second collection mechanism and the elements.

Abstract: Variations in the lift-off separation between a probe and the surface of a structure to be tested often mask the detection of defects in the structure. A method and apparatus for automatically classifying and compensating for variations in the lift-off is described. A reference signal at a known lift-off may be weighted by a corresponding calculated ratio parameter and subtracted from a test signal to compensate for lift-off. A number of reference signals are preferably obtained and the largest magnitude gradient for each reference signal is preferably determined. The largest magnitude gradient for subsequent test signals is also obtained and the corresponding reference signal with the closest largest magnitude gradient to the test signal is identified and the corresponding reference signal is selected in the related compensation procedure. Such a method has been found to restore the signal such that lift-off is removed and defects are easily identified.

Abstract: A wire rope tester including a magnetic testing device; the wire rope tester includes a Remote Data Recorder mounted on a sensor head of the magnetic testing device.