A system for controlling sonar beam shapes is provided. The system comprises at least one sonar transducer element having an emitting face. The at least one sonar transducer element is configured to generate a sonar beam having a path. The system also comprises a horn that is configured to rest within the path of the sonar beam. The horn is configured to reform a beam shape of the sonar beam.

This device consists of a hollow triangular pyramid shaped speaker mounting system that is divided into three cells. The device mounts into a corner of a structural space at the convergence of three plane surfaces such as two adjacent walls and the ceiling or the floor. The device would divide the acoustical waves from a speaker into three segments where diffusers would channel them into the pyramid toward the apex. A wave reverser would send the waves back toward the open base of the pyramid. When the three sound waves exit the device, they would merge and continue expanding along each of the three plane surfaces in the hosting structural space. Each segment of the sound waves would follow a path that takes the form of a folded horn. That would provide for a very large expansion of the sound waves coming from this device.

In an arrangement for transmitting power or data through a solid rigid substrate without penetrating the substrate, acoustic transducer components are mounted on the substrate by means of strain isolator elements which are welded or otherwise bonded to the substrate and providing an attachment surface to which the attachment interface of the acoustic transducer may be attached. The strain isolator element is of the same or similar acoustic impedance as the rigid substrate and may indeed be formed of the same material. Various geometries of strain isolator are disclosed, including a plain spacer block, and one comprising a stalk attached to the solid rigid substrate and topped by a disc in a ‘mushroom’ configuration.

In an arrangement for transmitting power or data through a solid rigid substrate without penetrating the substrate, acoustic transducer components are mounted on the substrate by means of strain isolator elements which are welded or otherwise bonded to the substrate and providing an attachment surface to which the attachment interface of the acoustic transducer may be attached. The strain isolator element is of the same or similar acoustic impedance as the rigid substrate and may indeed be formed of the same material. Various geometries of strain isolator are disclosed, including a plain spacer block, and one comprising a stalk attached to the solid rigid substrate and topped by a disc in a ‘mushroom’ configuration.

A flexible variable frequency ultrasonic therapeutic probe based on thermoacoustic effect of a carbon nanotube film comprises an ultrasonic sound production element, and a heat dissipation layer and an acoustic matching layer located on both sides thereof. The sound production element comprises a carbon nanotube film, metal electrodes and wires, and the shape and size of the sound production element can be adjusted according to the actual functional requirements. When a signal is accessed into the sound production element, the carbon nanotube film produces a corresponding temperature change, which causes the surrounding media to expand and contract and to excite ultrasonic waves. The present invention greatly improves the coupling efficiency between the probe and the subject, reduces the energy loss of ultrasonic waves, and enhances the uniformity of the sound intensity distribution in the affected part.

A flexible variable frequency ultrasonic therapeutic probe based on thermoacoustic effect of a carbon nanotube film comprises an ultrasonic sound production element, and a heat dissipation layer and an acoustic matching layer located on both sides thereof. The sound production element comprises a carbon nanotube film, metal electrodes and wires, and the shape and size of the sound production element can be adjusted according to the actual functional requirements. When a signal is accessed into the sound production element, the carbon nanotube film produces a corresponding temperature change, which causes the surrounding media to expand and contract and to excite ultrasonic waves. The present invention greatly improves the coupling efficiency between the probe and the subject, reduces the energy loss of ultrasonic waves, and enhances the uniformity of the sound intensity distribution in the affected part.

A booth includes one or more wall plates surrounding an internal space, a ceiling plate connected to the plates and above the space, and a communication portion connected to either the ceiling plate or an upper part of a wall plate and through which air flows. The communication portion includes area portions arranged along an air flow direction and each having an opening through which the air flows, the area portions including first, second, and third portions in this order from the outside of the booth towards the internal space, and a first area of the opening of the first portion along a surface perpendicular to the air flow direction is smaller than a second area of the opening of the second portion along the surface, and a third area of the opening of the third portion along the surface is smaller than the second area.

A booth includes one or more wall plates surrounding an internal space, a ceiling plate connected to the plates and above the space, and a communication portion connected to either the ceiling plate or an upper part of a wall plate and through which air flows. The communication portion includes area portions arranged along an air flow direction and each having an opening through which the air flows, the area portions including first, second, and third portions in this order from the outside of the booth towards the internal space, and a first area of the opening of the first portion along a surface perpendicular to the air flow direction is smaller than a second area of the opening of the second portion along the surface, and a third area of the opening of the third portion along the surface is smaller than the second area.

An acoustic device includes a micro-machined acoustic transducer element, an acoustically attenuating region, and an acoustic matching region arranged between the acoustic transducer element and the acoustically attenuating region. The acoustic transducer element is formed in a first substrate housing a cavity delimiting a membrane. A second substrate of semiconductor material integrating an electronic circuit is arranged between the acoustic transducer element and the acoustically attenuating region. The acoustic matching region has a first interface with the second substrate and a second interface with the acoustically attenuating region. The acoustic matching region has an impedance matched to the impedance of the second substrate in proximity of the first interface, and an impedance matched to the acoustically attenuating region in proximity of the second interface.

A meta atom for controlling acoustic parameters and metamaterials comprising the same, which includes a first resonator assembly having a pair of resonators configured of two resonators disposed apart from each other with respect to an axis direction; a second resonator assembly positioned inside the pair of resonators included in the first resonator assembly, and having at least one resonator; and partitions connected between the first resonator assembly and the second resonator assembly, and supporting the first and second resonator assembly.