A probe configured to measure the magnetic permeability of a magnetic body includes a first signal conductor and a second signal conductor that form a pair of signal conductors, the first and second signal conductors being a signal transmission path, and tip ends of the first and second signal conductors being disposed away from a surface of the magnetic body by a predetermined gap length and at a predetermined interval from each other; a linear conductor that electrically connects the tip ends of the first and second signal conductors and that extends between the tip ends; and a first ground conductor and a second ground conductor that form a pair of ground conductors disposed in the vicinity of the pair of signal conductors, tip ends of the first and second ground conductor being in contact with the surface of the magnetic body.

A magnetic sensor includes: plural sensitive elements 31 each including a soft magnetic material layer 105 having a longitudinal direction and a transverse direction and a conductor layer having higher conductivity than the soft magnetic material layer 105 and extending through the soft magnetic material layer 105 in a longitudinal direction, the sensitive element 31 having uniaxial magnetic anisotropy in a direction intersecting the longitudinal direction and being configured to sense a magnetic field by a magnetic impedance effect; and a connecting portion 32 continuous with the conductor layer of the sensitive element and configured to connect transversely adjacent sensitive elements 31 in series.

An apparatus and method for the non-destructive determination of the content of the magnetizable and/or non-magnetizable portion of a sample, in which the sample is provided in an air gap of a magnetically conductive yoke, an alternating magnetic field is generated by an alternating magnetic field strength of an excitation coil in the yoke, and first measurement data relating to the sample are collected using a measuring device which is inductively coupled to the yoke, and comparing the first measurement data to second measurement data relating to a reference sample, wherein the same alternating magnetic field strength or the same alternating magnetic field is applied to both the reference sample and the sample and the difference between the two collected sets of measurement data is included as a measure in the determination of the content for the magnetizable and/or non-magnetizable content portion of the sample.

A method for stress-induced magnetic field signal acquisition and stress measurement is disclosed. The method can include the following steps: a1, conducting AC magnetization on a to-be-tested structure by using an AC magnetic field with preset frequencies and strengths, and acquiring the excitation magnetic field signals in at least one cycle; a2, subtracting the excitation magnetic field signals in at least one cycle of a stress-free sample having the same material as the to-be-tested structure from the excitation magnetic field signals acquired in step a1 to obtain a stress-induced magnetic field signals of the to-be-tested structure; a3, quantitatively assessing the stresses in the to-be-tested structure by comparing the mean values of the stress-induced magnetic field signals acquired in step a2 with the pre-calibrated relationship of stresses and the mean values of the stress-induced magnetic field signals for the material of the to-be-tested structure.

An electromagnetic property measuring device includes a magnetic conductive structure, a coil, and a scattering parameter measuring unit. The magnetic conductive structure includes a first side facing a sample to be tested and a second side opposite to the first side, and the first side has a magnetic gap. The coil surrounds the magnetic conductive structure to generate a magnetic field with the magnetic conductive structure. The scattering parameter measuring unit is disposed at the first side and located within a range of the magnetic field.

The measurement device for measuring permeability and permittivity of an object, includes a probe in which a signal transmission line is formed and on which the object is capable of being disposed close to or in contact with the signal transmission line; a magnetic-field application unit configured to apply a magnetic-field to the object; a signal measurement instrument configured to measure a signal transmitted through the signal transmission line in each state in which the object is disposed and not disposed on the signal transmission line and in each state in which the magnetic-field is applied and not applied; a permeability processing unit configured to obtain the permeability of the object; and a permittivity processing unit configured to obtain the permittivity of the object, the both units obtaining based on the signal transmitted through the signal transmission line in each state in which the magnetic-field is applied and not applied.

The present invention discloses a measurement method for a B-H curve of magnetic material based on a magnetic-inductance principle, and relates to the field of electric engineering. A measurement apparatus includes an Epstein frame, an alternating power supply, a power analyzer, and an oscilloscope. The core content of the present invention is to perform electromagnetic coupling modeling on an Epstein frame based on a vector model of a magnetic circuit, where an iron core of the Epstein frame is formed by laminating a silicon steel sheet to be measured, and an excitation coil and a detection coil with the same turns number are wound around the iron core. The measurement process is to first obtain a reference B-H curve that only considers a nonlinear reluctance of the iron core, and then to derive a B-H curve considering an eddy current effect in a magnetic field at any frequency from the reference B-H curve. The present invention provides a measurement and simulation method for deriving a B-H curve at any frequency by only measuring a B-H curve at a certain frequency. The method, applicable to a measurement for B-H curves at middle and high frequencies, may obtain much higher accuracy.

The present disclosure relates to systems and methods for uniquely identifying buried utilities in a multi-utility region by sensing magnetic fields emitted from the buried utilities.

A method includes receiving, from a plurality of magnetic field receivers including magnetic sensors, data characterizing samples obtained by the plurality of magnetic field receivers, the samples of a combination of a first magnetic field and a second magnetic field resulting from interaction of the first magnetic field and an object; determining, using the received data, a polarizability index of the object, the polarizability index characterizing a magnetic polarizability property of the object; classifying, using the determined polarizability index, the object as threat or non-threat; and providing the classification. Related apparatus, systems, techniques, and articles are also described.

The present disclosure relates to systems and methods for uniquely identifying buried utilities in a multi-utility region. The system and methods may include sensing magnetic fields upon moving a magnetic field sensing locating device over a multi-utility region comprising a plurality of buried utilities. The sensed magnetic fields may be used to identify a plurality of location data points each indicative of location information pertaining to one or more buried utilities. Based on these location data points, a plurality of clusters may be generated where each cluster may include a set of location data points sharing common characteristics. The generated clusters may exhibit one or more patterns which may be identified and subsequently utilized for classifying the clusters to uniquely identify the buried utilities.