A system, method, and apparatus for reducing ringing effects associated with a transducer comprises a transducer body, a transducer cap, a piezoelectric element formed in the cap, and a damping material formed around the piezoelectric element wherein the damping material suppresses a ringing effect associated with the transducer, while an O-ring is used together with damping material to support high pressure applications up to 230 bars.

Disclosed is an ultrasonic transducer and a manufacturing method thereof. The transducer comprises a piezoelectric composite array having an array of rigid posts made of a piezoelectric material, with kerf spaces between the posts filled with a low density aerogel material.

Example acoustic emission sensors with integral acoustic generators are disclosed. Example apparatus disclosed herein include an acoustic receiver, an acoustic generator, and a wear plate. The acoustic generator is disposed adjacent to the acoustic receiver. The wear plate is acoustically coupled to the acoustic receiver and to the acoustic generator. The wear plate is to convey acoustic energy from the acoustic generator to the acoustic receiver through a structure under test to which the apparatus is coupled. The wear plate includes first acoustic isolation to impede transmission of acoustic energy from the acoustic generator to the acoustic receiver through the wear plate.

An ultrasonic device according to one aspect includes a case, a piezoelectric element, a sound absorbing material, and a vibration-proof material. The case defines a housing space. The piezoelectric element is disposed in the housing space. The sound absorbing material is disposed on a main face of the piezoelectric element and is made of a foaming material. The vibration-proof material is disposed around the sound absorbing material. The sound absorbing material includes a first opposing face opposed to the main face. The first opposing face has an uneven shape in which a plurality of protruding portions and a plurality of depression portions are alternately continued, and is rougher than the main face.

A transducer assembly operable to transmit ultrasonic energy in a desired direction towards a zone adapted to be acoustically coupled to an object or area of interest, the assembly comprising: a transducer layer; a backing material disposed behind said transduction material with respect to the desired direction; a back-matching layer disposed between the transducer layer and the backing material to reflect towards said transducer layer part of the ultrasonic energy directed from the transducer layer to the backing material.

The backing layer has an acoustic impedance higher than the acoustic impedance of the back-matching layer, the back-matching material has an impedance less that the impedance of the transducer layer and the transducer layer has a thickness greater than a of the wavelength of the ultrasound waves the assembly is configured to generate.

A process for manufacturing a transducer assembly is also disclosed.

An ultrasonic device includes a case, a piezoelectric element, a sound absorbing material, and a vibration-proof material. The case defines a housing space. The piezoelectric element is disposed in the housing space. The sound absorbing material is disposed on the piezoelectric element and is made of a foaming material. The vibration-proof material is disposed around the sound absorbing material and is in contact with an inner face of the case. Between the piezoelectric element and the sound absorbing material, a first space is formed.

A piezoelectric actuator which is capable of reduction of noise resulting from vibration of a piezoelectric element, a piezoelectric vibration device, and a portable terminal are provided. A piezoelectric actuator includes a piezoelectric element including a stacked body composed of internal electrodes and piezoelectric layers which are laminated, and a surface electrode disposed on one of main surfaces of the stacked body so as to be electrically connected to the internal electrodes; a flexible substrate electrically connected to the surface electrode; and a shock-absorbing material disposed on the flexible substrate. The shock-absorbing material, at least partly, is disposed on a first region of the flexible substrate which overlaps with the piezoelectric element.

Example acoustic emission sensors with integral acoustic generators are disclosed. Example apparatus disclosed herein include an acoustic receiver, an acoustic generator, and a wear plate. The acoustic generator is disposed adjacent to the acoustic receiver. The wear plate is acoustically coupled to the acoustic receiver and to the acoustic generator. The wear plate is to convey acoustic energy from the acoustic generator to the acoustic receiver through a structure under test to which the apparatus is coupled. The wear plate includes first acoustic isolation to impede transmission of acoustic energy from the acoustic generator to the acoustic receiver through the wear plate.

Disclosed is a piezoelectric transducer which is mounted to a target in use, comprising: a piezoelectric element having a front face which faces the target, and an opposing rear face which faces away from the target, wherein the piezoelectric element has a first acoustic impedance; an compression element located on the rear surface side of the piezoelectric element, the compression element having a second acoustic impedance which is less than the first acoustic impedance; and, a compression mechanism which urges the compression element towards the piezoelectric element such that the compression element is compressed between the compression mechanism and piezoelectric element.

A piezoelectric transducer comprises a piezoelectric element operable to transduce mechanical movement of the piezoelectric element to an electrical signal and to transduce an electrical signal in the piezoelectric element to a mechanical movement thereof, wherein the piezoelectric transducer is operable to transduce above a temperature of 200 C.