A method of manufacturing is provided. The method can include determining a cross-sectional shape of an object to be inspected using a sensor configured with a sensor coil. The method can also include providing a substrate having a profile matching the cross-sectional shape of the object. The method can further include applying a dielectric material to the substrate in a patter matching a shape of the sensor coil. The method can also include forming a first layer of a first material on the dielectric material by sputtering particles of the first material on the dielectric material in the pattern and forming additional layers of the first material atop the first layer by iteratively depositing the additional layers in the pattern via an additive manufacturing technique. A sensor including a sensor coil formed via the method is also provided.

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.

The steel plate material property testing device determining a material property of a surface of the steel plate by generating the eddy current in the steel plate includes: an eddy current tester disposed so as to face the steel plate; and a frame to which the eddy current tester is fixed, in which the eddy current tester includes: a coil disposed so as to form an alternating-current (AC) magnetic field in only one direction; an AC power supply unit connected to the coil; a sensor unit connected to the coil; and a material property determination unit connected to the sensor unit and determining the material property of the steel plate based on a measured signal obtained through the sensor unit.

The present invention relates to a sensor module for detecting unevenness of a surface, especially for detecting bulging and bowing of the pipe external surface. The sensor module comprises an arm assembly comprising an arm body having at least two ends, one or more surface contacting element mounted to at least one end of the arm body; a magnet assembly comprising at least one magnet to generate magnetic lines of force; and a magnetic sensor assembly comprising a magnetic sensor being assembled adjacent to the magnet for sensing changes in the magnetic lines of force in response to movement of the arm body. The invention also relates to an apparatus comprising the said sensor module and a method for detecting unevenness of a surface using the said sensor module.

An exemplary method of indicating a condition of grout within a post-tensioned tendon involves positioning a magnet and a metallic sensing plate in close proximity to an outer surface of the post-tensioned tendon; rotating the magnet and the metallic sensing plate around the outer surface of the post-tensioned tendon; measuring an amount of magnetic forces applied to the magnet during rotation of the magnet around the post-tensioned tendon; measuring an impedance between the metallic sensing plate and metallic strands within the post-tensioned tendon during rotation of the metallic sensing plate around the post-tensioned tendon; and generating an image of a cross-section of the post-tensioned tendon indicating one or more grout conditions in spatial proximity to the metallic strands within the post-tensioned tendon based on measurement data using the magnet and the metallic sensing plate.

An eddy current probe providing a first sensor element having a first body and a first induction coil mounted onto a distal portion of the first body, a second sensor element having a second body and a second induction coil mounted onto a distal portion of the second body, a probe casing provided with first and second through-holes inside which are respectively mounted proximal portions of the first and second bodies of the first and sensor elements, the distal portions of the first and second bodies protruding outwards with regard to the probe casing, and a cap mounted onto the probe casing and covering the distal portions of the first and second bodies and the first and second induction coils.

A method for characterizing at least one joined connection between at least two components, whereby an eddy-current sensor is consecutively moved several times over the at least one weld, thereby generating a plurality of data sets of the detected measuring signals in various parallel sectional planes of the weld, and whereby, on the basis of the plurality of data sets, a projection data set is subsequently determined as the measure of the spatial distribution of the measuring signals along the at least one joined connection.

The invention discloses an NDT device for pipeline, belonging to the field of NDT, including a mobile carrier, which moves with fluid in pipeline or is moved by an actuator; a probe testing assembly, which includes a testing component installed on the mobile carrier and having a testing element in which testing probe is encapsulated; a data processing unit, a first signal conditioning unit and a second signal conditioning unit, wherein the testing probe includes an excitation coil, a receiving coil and a passive resonance coil between the excitation coil and the receiving coil. For the invention, no more magnetizing treatment device is needed for testing, so that the system volume is greatly reduced, thereby reducing the requirement of the testing system of the invention on the internal cleanliness of a pipeline, improving flexibility of equipment in the pipeline of the testing system, and greatly reducing the system cost.

The present invention provides a method for eddy current thermography defect reconstruction based on electrical impedance tomography, first, obtaining a thermal reference image of temperature change with time by acquiring a thermogram sequence S of the specimen in the process of heating and fitting a curve for pixels of each location of the thermogram sequence S, then, creating a current matrix and a magnetic potential matrix, and calculating the satisfied conductivity distribution through iterations, so as a reconstructed image is obtained, then taking the low conductivity area of the reconstructed image as the defect profile, thus the defect profile is identified and quantified.

A method may include positioning an eddy current probe proximate to a coated portion of an article. The coated portion of the article includes a conductive substrate and a ceramic coating overlying the conductive substrate. The method includes generating, using the eddy current probe, a first primary magnetic field to induce eddy currents in the coated portion of the article and measuring, using the eddy current probe, a strength of a first secondary magnetic field created by the eddy currents in the coated portion of the article to obtain a first secondary magnetic field measurement. The method includes determining, by a computing device, one or more properties or one or more changes in properties of the article based on the first secondary magnetic field measurement.