An electromagnetic ultrasonic double wave transducer, comprising a shell (1), and a permanent magnet assembly, a coil (4), a shielding layer (5), and a wire (6) which are provided in the shell (1). The permanent magnet assembly comprises a first permanent magnet (2) and a second permanent magnet (3) sleeved on the first permanent magnet (2). The magnetizing directions of the first permanent magnet (2) and the second permanent magnet (3) are perpendicular to the bottom of the shell (1), and the magnetic field directions of the first permanent magnet (2) and the second permanent magnet (3) are opposite. A non-conducting non-magnetic bushing material (9) is provided between the first permanent magnet (2) and the second permanent magnet (3), and upper end faces of the first permanent magnet (2) and the second permanent magnet (3) realize magnetic circuit closing by means of a magnetic circuit closing element (8). The coil (4) is fixed on the bottom of the shell (1) and is located below the first permanent magnet (2). The shielding layer (5) is provided between the lower end of the first permanent magnet (2) and the coil (4) and below the second permanent magnet (3). One end of the wire (6) is connected to the coil (4), and the other end is connected to the power supply and signal plug (7). The electromagnetic ultrasonic double-wave transducer can simultaneously stimulate longitudinal wave and transverse wave on the surface of the part to be inspected, and the inspection accuracy is improved.

A rock breaking device and a method of monitoring a condition of a tool of a rock breaking device is provided. The rock breaking device includes a frame, a tool, a device for generating stress waves in the tool, measuring means for measuring the stress wave propagating in the tool and at least one computing unit for monitoring a condition of the tool on the basis of the measured stress wave. The at least one computing unit is configured to determine a condition of the tool on the basis of a time of propagation of at least one reflected stress wave component of the stress wave and at least one additional property of the same reflected stress wave component.

A tester for evaluating pullout load capacity and bond quality of anchor bolts embedded in concrete includes a Schmidt hammer for measuring a rebound number and an ultrasonic pulse velocity tester for measuring the transit time of a pulse transmitted through concrete surrounding an anchor bolt. The rebound number and the transit time are combined and matched against a database record which identifies the pullout load capacity and the bond quality. The transit time is matched to thresholds of transit times associated with porosity, internal cracking, air voids, and water pockets located around the embedded anchor bolt. The Schmidt hammer is further modified by the incorporation of a digital level for measuring the vertical and horizontal angles of inclination of the plunger with the concrete surface, a guide tube for supporting the plunger, and by using a convex plunger tip for improved registration with anchor bolt head.

A method of non-destructive testing of an article (20) is described. The article has a first surface (21). The article (20) article (20 comprises a set of passageways (200), including a first passageway (200 A). Respective sets of flaws (2000) are associated with respective passageways of the set of passageways (200), including a first set of flaws (2000A), optionally including a first flaw (2000AA), associated with the first passageway (200 A). The method comprises phased array ultrasonic scanning of the article (20) using a phased array probe communicatively coupled thereto through the first surface (21); and detecting the first flaw (2000AA), if included in the first set of flaws (2000A) associated with the first passageway (200A).

A tester for evaluating pullout load capacity and bond quality of anchor bolts embedded in concrete includes a Schmidt hammer for measuring a rebound number and an ultrasonic pulse velocity tester for measuring the transit time of a pulse transmitted through concrete surrounding an anchor bolt. The rebound number and the transit time are combined and matched against a database record which identifies the pullout load capacity and the bond quality. The transit time is matched to thresholds of transit times associated with porosity, internal cracking, air voids, and water pockets located around the embedded anchor bolt. The Schmidt hammer is further modified by the incorporation of a digital level for measuring the vertical and horizontal angles of inclination of the plunger with the concrete surface, a guide tube for supporting the plunger, and by using a convex plunger tip for improved registration with anchor bolt head.

A device and a system monitor wear of lifters mounted in a mineral crusher. An elongated bolt maintains a lifter in place on an internal face of the crusher. A threaded section of the bolt terminates at a proximal end protruding externally through a hole of the crusher. A shank of the bolt terminates at a distal end opposite from the proximal end. The shank extends along a height of the lifter and wears as the lifter wears when the crusher is in operation. A transducer coupled to the proximal end of the bolt generates a sound wave applied to the proximal end of the bolt, detects an echo of the sound wave reflected by the distal end of the bolt, and reports to a controller a time delay between the sound wave and the echo. The controller evaluates a wear of the lifter based on the time delay.

An arrangement for non-destructive testing of a component part, which may include a first end surface and a second opposite end surface. The arrangement may include a plurality of discrete piezoelectric transduction elements arranged in a circular array on the first end surface, and an electric wave signal transmitting and receiving unit electrically coupled to the piezoelectric transduction elements. The electric wave signal transmitting and receiving unit may be able to generate an electric excitation wave signal and to receive an electric response wave signal. The piezoelectric transduction elements may deform, upon an application of the electric excitation wave signal, in an in-phase shearing motion parallel to the first end surface and in respective tangential direction with respect to the circular array so as to generate a corresponding structure-borne wave in the component part at the first end surface such that said structure-borne wave can propagate in the component part.

Exemplary embodiments are directed to instrumented fasteners and associated damage detection systems for detecting damage in an assembled structure secured together by at least one instrumented fastener. The instrumented fastener forms a transducer assembly for detecting damage in the assembled structure. The fastener can include a cavity disposed at one end of the fastener. The transducer assembly includes an electromechanical unit at least partially inserted into and mechanically coupled within the cavity of the fastener. The electromechanical unit can include a piezoelectric element.

A compact directional high resolution magnetostrictive phased array sensor (MPAS) includes a magnetostrictive comb-shaped patch and a magnetic circuit device. The patch was machined with 24 comb fingers along its radial direction. The magnetic circuit device contains a sensing array of angularly spaced apart sensing coils and cylindrical biasing magnets. The individual sensing coils have distinct directional sensing preferences designated by the normal direction of the coil winding. The directional sensing feature of the developed MPAS is supported by the combined effect of the magnetic shape anisotropy of the comb finger formation in the patch and the sensing directionality of the sensing array. The MPAS detects the strain-induced magnetic property change on the comb-shaped patch due to the mechanical interaction between the patch and GLWs propagating in the structure under study. The array sensor enables to acquire signal data from different sensing sections within the patch by altering the rotational orientation of the magnetic circuit device.

According to one embodiment, an inspection apparatus determines an object to be in a first state when an intensity at a first frequency of a frequency characteristic is not less than a first threshold, and determines the object to be in a second state when the intensity at the first frequency is less than the first threshold. The frequency characteristic is generated based on a vibration of the object when the object is struck. The second state is different from the first state.