An apparatus for validating magnets on site, including a standard reference magnet for providing a governing reference, a reference magnet for providing a reference based on the governing reference, a gauss meter, a hall probe, and a scanner. The reference magnet is arranged to be taken on site for further magnetic validation and includes guide members to target a nominated magnetic field density.

An apparatus for validating magnets on site, including a standard reference magnet for providing a governing reference, a reference magnet for providing a reference based on the governing reference, a gauss meter, a hall probe, and a scanner. The reference magnet is arranged to be taken on site for further magnetic validation and includes guide members to target a nominated magnetic field density.

A magnetic field measurement device measures a magnetic flux density vector or a magnetic field vector generated from each of segments obtained by segmenting a measurement target surface of a vehicle. A magnetic field evaluation device includes a propagation intensity calculation unit and a display control unit. The propagation intensity calculation unit calculates propagation intensity that is the intensity of a magnetic field or the magnitude of magnetic flux density that propagates from each of the segments to an evaluation point that is separated from the measurement target surface with use of the magnetic flux density vector or the magnetic field vector in each of the segments and a separation distance between the segments and the evaluation point. A display control unit displays on a display unit a propagation intensity distribution image indicating the position of the evaluation point and distribution of the propagation intensity in each of the segments.

A magnetic field measurement device measures a magnetic flux density vector or a magnetic field vector generated from each of segments obtained by segmenting a measurement target surface of a vehicle. A magnetic field evaluation device includes a propagation intensity calculation unit and a display control unit. The propagation intensity calculation unit calculates propagation intensity that is the intensity of a magnetic field or the magnitude of magnetic flux density that propagates from each of the segments to an evaluation point that is separated from the measurement target surface with use of the magnetic flux density vector or the magnetic field vector in each of the segments and a separation distance between the segments and the evaluation point. A display control unit displays on a display unit a propagation intensity distribution image indicating the position of the evaluation point and distribution of the propagation intensity in each of the segments.

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.

A wall thinning detection system includes a polarized magnetic charge distribution computing unit configured to compute a spatial distribution of polarized magnetic charges, which is an aggregate of a plurality of magnetic dipoles in a monitoring area, based on a magnetic field distribution in the monitoring area of a metal instrument measured by a magnetic field sensor array comprising a plurality of magnetic field sensors, and a wall thinning distribution computing unit configured to compute a wall thinning distribution in the monitoring area based on the spatial distribution of the polarized magnetic charges calculated by the polarized magnetic charge distribution computing unit.

A sensor device includes a carrier, a force feedback sensor, and a probe containing a spin defect, the probe being connected to the force feedback sensor either directly or indirectly via a handle structure. In order to couple the spin defect to a microwave field in an efficient and robust manner, the sensor device includes an integrated microwave antenna arranged at a distance of less than 500 micrometers from the spin defect. The sensor device can be configured as a self-contained exchangeable cartridge that can easily be mounted in a sensor mount of a scanning probe microscope.

A system for determining the position of a pig located inside a pipe including a magnetic field source attached to the pig; at least one magnetic field sensor provided on the outside of the pipe and configured to measure magnetic field parameters; and a processor configured to receive magnetic field parameters from the at least one magnetic field sensor and computing a position of the magnetic field source relative to a given reference position. The method includes: establishing a magnetic field representation of the magnetic field provided by the magnetic field source; in-situ measuring at least two magnetic field parameters outside the pipe with a magnetic field sensor at a measuring position relative to the reference position; computing the source position of the magnetic field source relative to the reference position based on data comprising the in-situ measured magnetic field parameters and the magnetic field representation.

A system for determining the position of a pig located inside a pipe including a magnetic field source attached to the pig; at least one magnetic field sensor provided on the outside of the pipe and configured to measure magnetic field parameters; and a processor configured to receive magnetic field parameters from the at least one magnetic field sensor and computing a position of the magnetic field source relative to a given reference position. The method includes: establishing a magnetic field representation of the magnetic field provided by the magnetic field source; in-situ measuring at least two magnetic field parameters outside the pipe with a magnetic field sensor at a measuring position relative to the reference position; computing the source position of the magnetic field source relative to the reference position based on data comprising the in-situ measured magnetic field parameters and the magnetic field representation.

A reactor includes a toroidal coil including a winding wound to have an annular outer shape, a bus bar electrically connected to one end of the winding, and a current sensor that measures electric current flowing through the bus bar. The bus bar includes a crossing passing through a central area including an area inside an internal surface of the annular outer shape and an area in which the area extends along a central axis of the annular outer shape, and the current sensor measures electric current flowing through the crossing.