A magnetic property acquisition unit detects an induced voltage caused by vibration of a measurement sample magnetized by an excitation electromagnet and acquires a magnetic property that indicates a relationship between a magnetic flux density and an external magnetic field. The magnetic flux density is a sum of magnetization of the measurement sample and the external magnetic field. When acquiring the magnetic property of the measurement sample to which pressure is being applied, a control device sets a first magnetic field value as a sweep start value, and performs sweeping with a magnetic field equal to or less than the first magnetic field value. The first magnetic field value is smaller than a second magnetic field value that is acquired before the pressure is applied to the measurement sample, and corresponds to a saturation magnetic flux density of the measurement sample to which the pressure is not being applied.

This disclosure provides systems, methods and apparatus for detecting foreign objects. In one aspect an apparatus for detecting a presence of an object is provided. The apparatus includes a resonant circuit having a resonant frequency. The resonant circuit includes a sense circuit including an electrically conductive structure. The apparatus further includes a coupling circuit coupled to the sense circuit. The apparatus further includes a detection circuit coupled to the sense circuit via the coupling circuit. The detection circuit is configured to detect the presence of the object in response to detecting a difference between a measured characteristic that depends on a frequency at which the resonant circuit is resonating and a corresponding characteristic that depends on the resonant frequency of the resonant circuit. The coupling circuit is configured to reduce a variation of the resonant frequency by the detection circuit in the absence of the object.

A Barkhausen noise sensing device for inspecting an object made of ferromagnetic material, having a transceiver coil configured for generating an excitation magnetic field within the object and detecting a Barkhausen noise emitted by the object and a powering unit connected to the transceiver coil and connectable to a power source. The powering unit is configured for providing the transceiver coil with an Alternating Current (AC) electrical signal. Also provided is a detection unit connected to the transceiver coil for detecting an induced magnetic field emitted by the object and being indicative of the Barkhausen noise. The detection unit is configured for outputting a detection signal indicative of the detected induced magnetic field.

A material property determining system operable to determine properties of a conduit. The material property determining system includes a tool movable along a conduit and having at least one sensing device for sensing at least one property of the conduit. A processor is operable to process outputs of the at least one sensing device. Responsive to processing of the outputs by the processor, the processor correlates the processed outputs to determine the type of material of the conduit.

A tester for bonded composite materials uses a magnetic source to generate a response signal from wires infused in an adhesive used between layers of the composite material. Acoustic or magnetic response signals, separately or in combination, can be received and analyzed to detect stresses in wires indicative of voids in the adhesive or other defects affecting the bond quality between layers of the composite material.

A system is provided that can include a first tube for communicating a fluid through a wellbore. The system can also include a gap between the first tube and a first electromagnetic acoustic transducer (EMAT). The first EMAT can be positioned to magnetically couple with the first tube. The first EMAT can include a magnet and a wire coil positioned around the magnet. The first EMAT can coupled to a power source and positioned to, responsive to receiving a power from the power source, apply a first magnetic force to the first tube for determining a density or viscosity of the fluid.

The invention relates to a method for observing a magnetic field of a material volume, in particular for determining properties of a workpiece under, in particular, magnetic, mechanical, thermal, and/or electrical excitation of a material volume of the workpiece, wherein the magnetic field of the material volume is sensed as a function of time and of frequency with high frequency resolution.

An inspection system for performing multi-sensing inspection of a specimen is provided. The inspection system includes an inspection apparatus arranged to acquire at least stress data characterizing stress on a specimen being inspected at a plurality of points along the specimen, NDE data characterizing flaws within the specimen and dimensional properties of the specimen at the plurality of points along the specimen and positional data characterizing a location of the plurality of points along the specimen. The system also includes a computing system including at least one data processor and a memory storing instructions which can cause the at least one data processor to perform operations including: receiving the stress data, the NDE data and the positional data, generating a comprehensive representation of the specimen and providing the comprehensive representation to a user interface display communicatively coupled to the computing system.

This disclosure provides systems, methods and apparatus for detecting foreign objects. In one aspect an apparatus for detecting a presence of an object is provided. The apparatus includes a resonant circuit having a resonant frequency. The resonant circuit includes a sense circuit including an electrically conductive structure. The apparatus further includes a coupling circuit coupled to the sense circuit. The apparatus further includes a detection circuit coupled to the sense circuit via the coupling circuit. The detection circuit is configured to detect the presence of the object in response to detecting a difference between a measured characteristic that depends on a frequency at which the resonant circuit is resonating and a corresponding characteristic that depends on the resonant frequency of the resonant circuit. The coupling circuit is configured to reduce a variation of the resonant frequency by the detection circuit in the absence of the object.

An inspection system is disclosed herein. The inspection system includes a control system and a hub assembly. The control system includes a base having a top surface and configured to move horizontally forward and backward, an upright member extending orthogonally from the top surface of the base and configured to move vertically up and down, the upright member having a top surface, and an elongated member extending orthogonal to the upright member having a proximal end and a distal end, the proximal end connected to the top of the upright member, wherein the elongated member is configured to rotate. The hub assembly is connected to the distal end of the elongated member. The hub assembly includes a spring-loaded arm extending orthogonally from the hub assembly and a sensor connected to a distal end of the spring-loaded arm.