The present invention relates to an ultrasonic testing apparatus with a variable frequency, which can automatically change the frequency according to thickness and thereby detect internal defects in objects having various thicknesses. The ultrasonic testing apparatus may comprise: a nozzle jetting a medium toward an object so as to form a medium column; and a plurality of probes disposed in the nozzle so as to generate ultrasonic waves.

Among other things, there is disclosed structure and methods for registering images obtained through internal (e.g. intravascular) ultrasound devices. Embodiments of a device with a rotating ultrasound beam is provided, with a wall of the device being anisotropic in ultrasound passage. As examples, a cable opaque to ultrasound is attached along the wall of the device, so that the ultrasound beam at the location of the cable is blocked, reflected or scattered. As another example, a thin film of metallic material is placed on or in the wall to allow a portion of the beam to be blocked or attenuated. The imaging system recognizes the changes to the signals made by the anisotropic wall, and registers successive images according to those changes.

Various implementations include loudspeakers and related waveguides. The loudspeakers can include an adjustable waveguide for modifying the coverage pattern of the audio output. In some particular aspects, a loudspeaker includes: a single speaker box with at least one driver; a waveguide having: a pair of opposing walls that are fixed with respect to the at least one driver; and at least one adjustable wall that is adjustable relative to the at least one driver; and at least one fin coupled to the waveguide for accommodating a gap between the pair of opposing walls and the at least one adjustable wall.

A device for superscattering a target acoustic wave may include a body having an outer surface, at least one resonator being defined within the body and extending to an opening defined within the outer surface and configured to cause the superscattering of the target acoustic wave impinging upon the body, and a motor connected to the body and configured to selectively rotate the body.

A portable ultrasound probe is described having a mechanical transducer, rotating mirror, and mirror motor. The transducer can be used for diagnostic imaging and procedural guidance imaging. The probe has a light weight design for easy one-handed use, and can use external processors to provide proper image display with accompanying software.

A waveguide assembly for a loudspeaker is provided. The waveguide assembly includes a plurality of panels and a plurality of trays, which together at least partially defines a waveguide. One or more of the panels are arranged to be movable relative to the trays to adjust a coverage pattern of the waveguide.

A portable ultrasound probe is described having a mechanical transducer, rotating mirror, and mirror motor. The transducer can be used for diagnostic imaging and procedural guidance imaging. The probe has a light weight design for easy one-handed use, and can use external processors to provide proper image display with accompanying software

A waveguide assembly for a loudspeaker is provided. The waveguide assembly includes a plurality of panels and a plurality of trays, which together at least partially defines a waveguide. One or more of the panels are arranged to be movable relative to the trays to adjust a coverage pattern of the waveguide.

Various implementations include loudspeakers and related waveguides. The loudspeakers can include an adjustable waveguide for modifying the coverage pattern of the audio output. In some particular aspects, a loudspeaker includes: a single speaker box with at least one driver; a waveguide having: a pair of opposing walls that are fixed with respect to the at least one driver; and at least one adjustable wall that is adjustable relative to the at least one driver; and at least one fin coupled to the waveguide for accommodating a gap between the pair of opposing walls and the at least one adjustable wall.

A portable ultrasound probe is described having a mechanical transducer, rotating mirror and mirror motor. The transducer can be used for diagnostic imaging and procedural guidance imaging. The probe has a light weight design for easy one handed use, and can use external processors to provide proper image display with accompanying software.