An electro-magnetic acoustic transducer (EMAT) having an electromagnet array is provided. The electromagnet array includes electromagnets. Each electromagnet includes a magnetic core and a wound coil wrapped around the magnetic core. The electromagnet array generates bias magnetic fields having different patterns when the wound coils are energized differently. For instance, the electromagnet array generates a bias magnetic field having a given pattern, for the EMAT to transmit a first type of ultrasonic wave such as shear-horizontal wave, when the wound coils are energized in a given manner; and generates a bias magnetic field having a different pattern, for the EMAT to transmit a second type of ultrasonic wave such as a Lamb wave, when the wound coils are energized in a different manner.

An electro-magnetic acoustic transducer (EMAT) system and method for controlling the EMAT system are provided. The system includes an electromagnet array with one or more electromagnets. Each electromagnet includes a magnetic core and a wound coil wrapped around the magnetic core. The electromagnet array generates bias magnetic fields having different patterns when the wound coils are energized differently.

A multifunctional haptic actuator (1) having a plurality of functional actuation modes, comprising an actuation arrangement (2) and at least one moveable energy storage (3). The actuation arrangement (2) provides and/or facilitates movement of the energy storage (3) along and/or around a plurality of actuation axes. The energy storage (3) is adapted for supplying electric charge to drive the actuation arrangement (2), and storing electric charge generated by the actuation arrangement (2). A first functional actuation mode comprises generating mechanical vibrations by supplying electric charge from the energy storage (3) to the actuation arrangement (2), the electric charge generating movement of the energy storage (3). A second functional actuation mode comprises generating electric charge by means of mechanical vibrations of the energy storage (3), the vibrations generating electric charge in the actuation arrangement (2), the electric charge being stored in the energy storage (3). This solution provides an actuator the components of which can be used in several different actuation modes such as for providing haptic feedback and harvesting energy, hence reducing the need for separate components for each mode.

Systems and methods for detecting corrosion in pipes are disclosed herein. In one embodiment, an apparatus for detecting corrosion in an object includes an electromagnetic acoustic transducer (EMAT) having a ferromagnetic core and a plurality of permanent magnets arranged peripherally around the ferromagnetic core. The permanent magnets are arranged to produce a magnetic field through the ferromagnetic core. The apparatus also includes a coil between the ferromagnetic core and the object.

Systems and methods for detecting corrosion in pipes are disclosed herein. In one embodiment, an apparatus for detecting corrosion in an object includes an electromagnetic acoustic transducer (EMAT) having a ferromagnetic core and a plurality of permanent magnets arranged peripherally around the ferromagnetic core. The permanent magnets are arranged to produce a magnetic field through the ferromagnetic core. The apparatus also includes a coil between the ferromagnetic core and the object.

An electro-magnetic acoustic transducer (EMAT) having an electromagnet array is provided. The electromagnet array includes electromagnets. Each electromagnet includes a magnetic core and a wound coil wrapped around the magnetic core. The electromagnet array generates bias magnetic fields having different patterns when the wound coils are energized differently. For instance, the electromagnet array generates a bias magnetic field having a given pattern, for the EMAT to transmit a first type of ultrasonic wave such as shear-horizontal wave, when the wound coils are energized in a given manner; and generates a bias magnetic field having a different pattern, for the EMAT to transmit a second type of ultrasonic wave such as a Lamb wave, when the wound coils are energized in a different manner.

Systems and methods for detecting corrosion in pipes are disclosed herein. In one embodiment, an apparatus for detecting corrosion in an object includes an electromagnetic acoustic transducer (EMAT) having a ferromagnetic core and a plurality of permanent magnets arranged peripherally around the ferromagnetic core. The permanent magnets are arranged to produce a magnetic field through the ferromagnetic core. The apparatus also includes a coil between the ferromagnetic core and the object.

An EMAT system (1) for detecting surface and internal discontinuities (2) in thick conductive structures (90) at high temperatures, comprising a magnet (4) that generates a static magnetic field (SMF) and an HF electric coil (6) for inducing, or being induced by, eddy currents in the material (14). It comprises a perforated matrix-array laminated magnetic core (22) placed between the HF electric coil (6) and the inspected material (3), which is made up of a multitude of apertured HF active laminae (29) incorporating a ferromagnetic material, and of apertured insulating passive laminae (53). Trough-holes (41, 57) are drilled through each lamina (29, 53) and form a grooved cylindrical aperture (39). Parallel induced-current loops (43) encircle each magnetic trough-hole (41) of the HF active laminae (29). Cooling means (58) force a heat-transfer fluid (60) to pass through the grooved cylindrical aperture (39).

A system for non-destructive inspection that generates Shear Horizontal waves in phased array configuration using an Electro Magnetic Acoustic Transducer (EMAT). The system includes an EMAT transducer with a plurality of elements made of individually wound elements under a single magnetic field, and an instrument to pulse, receive and record the signals from each element separately. Each wired element in the array generates shear waves perpendicularly to the coil windings which radiate around the elements' long axis. By phasing the pulsing and receiving of the individual elements, the beam can be electronically focused at different angles in the component from 0° to +/−90°. The compact distribution of the array permit using relatively high frequencies without generating deleterious grating lobes.

Systems and methods for detecting corrosion in pipes are disclosed herein. In one embodiment, an apparatus for detecting corrosion in an object includes an electromagnetic acoustic transducer (EMAT) having a ferromagnetic core and a plurality of permanent magnets arranged peripherally around the ferromagnetic core. The permanent magnets are arranged to produce a magnetic field through the ferromagnetic core. The apparatus also includes a coil between the ferromagnetic core and the object.