Systems and methods for non-destructive testing of specimens are disclosed herein. In one embodiment, an electromagnetic acoustic transducer (EMAT) includes an electro-permanent magnet (EPM) configured to controllably apply a biasing magnetic flux to a target location. The EPM includes a hard magnet, and a soft magnet at least partially enclosing the hard magnet. The EPM also includes a magnetizing coil having a plurality of turns at least partially encircling the soft magnet. The magnetizing coil is configured to controllably magnetically bias the soft magnet when a current is applied to the magnetizing coil.

Some aspects of the present disclosure feature a sensing device (e.g. for temperature, moisture or detection of substances) comprising a magnetic bias layer, a resonator, a spacer, and an environmental change receptor. The spacer is disposed between the magnetic bias layer and the resonator. At least one of the resonator surfaces has a predefined channel. The environmental change receptor is disposed proximate to the predefined channel. In response to a change in environment, the environmental change receptor distributes along a part of the channel.

A method for determining the geometry of a metallic object, with in particular one or more real, examined defects, with a reference data set of the object generated on the basis of at least one measurement by at least one non-destructive measuring method,

preferably comprising an at least partial representation of the object on or by an at least three-dimensional object grid by means of a computer unit,
wherein a classification of anomaly-free areas and anomaly-affected areas of the object is performed on the basis of at least parts of the at least one reference data set,
wherein an initial object grid is created, a prediction data set of the at least one non-destructive measurement method is calculated by a simulation routine using the initial object grid, at least parts of the prediction data set are compared with at least parts of the at least one reference data set, excluding the anomaly-afflicted regions, and the initial object grid is used as an object grid describing the geometry of the object as a function of at least one accuracy measure, or the initial object grid is iteratively adapted to the geometry of the object in the anomaly-free regions by means of the EDP unit.

Some aspects of the present disclosure feature a sensing device comprising a magnetic bias layer, a resonator, a spacer, and a housing. The spacer includes an environmental change receptor. The thickness of the environmental change receptor rapidly increases in response to a change to an environment variable.

This invention discloses a system to automate a non-destructive test (NDT) for measuring stress or stress change developed within an object during a certain time period by using unmanned aerial vehicles (UAV) and ultrasound technique. The system comprises a ground control station (GCS), UAVs and reference positioning modules as its basis. Given a test plan containing test points over a surface of a test object in 3D point coordinates, UAVs can fly autonomously to the points and perform ultrasound measurements on them with a single or a plurality of ultrasound transducers in an automated manner. Moreover, after receiving trigger signals from the GCS, a UAV can also perform the flight and the measurement synchronously with other UAVs. After a measurement, an acquired ultrasound echo signal is taken with another echo signal acquired at a different time point to compute stress or stress change.

A probe arrangement for a testing system includes a base carrier that defines a longitudinal direction, which can be oriented parallel to a testing direction, and a transverse direction, which can be oriented perpendicularly to the testing direction. The base carrier carries a plurality of probe holders which are arranged next to one another in a row in the transverse direction. Each probe holder has a first probe region, which is equipped with at least one first probe, and a second probe region, which is equipped with at least one second probe. Each probe region defines an effective testing width such that, during relative movement of the test subject with respect to the probe arrangement along the testing direction through the probe region, a testing track having the effective testing width can be tested in a gap-free manner. The first probe region and the second probe region are arranged so as to be offset in relation to one another parallel to the longitudinal direction and parallel to the transverse direction such that a first testing track covered by the first probe region transitions on one side in a gap-free manner into a second testing track covered by the second probe region of the same probe holder, and transitions on the opposite side in a gap-free manner into a second testing track covered by a second probe region of a directly adjacent probe holder.

Provided is a test sensor using a magnetostrictively induced guided wave based on an open magnetic circuit, comprising an excitation coil, a receiving coil and a magnetic device, the magnetic device comprises multiple test modules circumferentially and uniformly disposed thereon so as to be absorbed to the outer side of a to-be-tested slender component, each test module comprises a housing, a permanent magnet and a magnetic plate, two adjacent housings are connected to each other via an adjusting device, the excitation coil and the receiving coil are disposed in the vicinity of the test module, and are coaxially fit on the outer side of the to-be-tested slender component, the excitation coil operates to generate induced voltage in the receiving coil after the sinusoidal alternating current is input, and a computer can determine whether a defect occurs in the to-be-tested slender component after receiving the induced voltage. The sensor of the invention features simple structure, small size, light weight and convenient installation. Moreover, by serially connecting the sensor with multi-layered test coils disposed on both sides of the permanent magnet, it is possible to enhance an amplitude of a test signal, and to improve test sensitivity.

To provide a photoacoustic probe capable of acquiring subject information for reducing generation of artifacts without increasing the number of wires connected to the outside. Provided is a probe including a plurality of ultrasonic transducers, wherein the ultrasonic transducers are divided into a plurality of groups, two adjoining ultrasonic transducers belong to different groups, and the probe includes a group selection unit configured to switch signals of the ultrasonic transducers to be outputtable for each of the groups.

A threaded connection make up monitoring system includes an acoustic emission transducer operatively connected to one positioned to capture an acoustic signature associated with forming the threaded connection between a first member and a second member. A controller is operatively coupled to the acoustic emission transducer. The controller is operable to receive a signal from the acoustic emission transducer embodying the acoustic signature. The controller is operable to output a signal indicating whether the acoustic signature represents a properly made up threaded connection of the first member and the second member or whether the acoustic signature represents an improperly made up threaded connection of the first member and the second member.

An ultrasound probe includes: a metal case including a bottom wall portion having a vibration surface, and a side wall portion connected to the bottom wall portion; a coil mounted on one surface of the side wall portion; and a magnet mounted in such a way as to sandwich the coil between the magnet and the one surface of the side wall portion, in which the coil causes an eddy current to occur in the one surface of the side wall portion, and causes the bottom wall portion to vibrate, by using a Lorentz force occurring in the side wall portion because of the interaction between the eddy current and a magnetic field generated by the magnet.