A flow meter includes a pair of ultrasonic transducers. Each transducer includes a housing, a piezoelectric crystal disposed within the housing, and a mini-horn array coupled to the housing. The mini-horn array, which may be formed via a 3D printing technique, includes an opening-free enclosure, a closed cavity inside the enclosure, and a plurality of horns enclosed within the closed cavity. The horns include a horn base portion adjacent to a proximal end surface of the cavity and a horn neck portion that extends from the base portion in a direction away from the piezoelectric crystal and towards a distal end surface of the cavity. The horn neck portions are separated by spaces within the cavity, wherein the spaces between the horn necks may be filled with powder.

System for inducing sonoporation of a drug into cancer cells in a tumor and method thereof, the system comprising a generator configured to provide electrical energy at an ultrasound frequency; an ultrasound probe electrically connected to the generator and configured to convert the electrical energy into low intensity pulsed ultrasonic waves defined by operation parameters, said operation parameters comprising the frequency, the duty cycle, the operation time of the ultrasonic waves; an input device enabling an operator to enter configuration data comprising: type of tumor, type of drug, localization of secondary tumor, anthropometric measurements and grade of tumor, and a processor configured to determine the values of the operation parameters on the basis of the entered configuration data and control the generator and the ultrasound probe to operate according to said determined values, wherein the value of the frequency is determined on the basis of the type of tumor, the localization of the tumor, the grade of tumor and the anthropometric measurements, the value of the duty cycle is determined on the basis of the drug, the type of tumor and the grade of the tumor, and the value of said operation time being determined on the basis of at least the type of tumor and the type of drug.

A data link (101) for a MIMO communication system (100) comprises a first transceiver device (106A) comprising a body (109A) having a transducer mounting surface near or at which is mounted a plurality of first transducers (107A-107D) configured to, in use, receive and convert a plurality of electrical waveforms to a respective plurality of acoustic signals. A first bonding layer (120A) bonds a barrier mounting surface of the body of the first transceiver device to a barrier (103). The data link further comprises a second transceiver device (106B) comprising a body (109B) and a plurality of second transducers (107′A-107′D) configured to receive and convert the plurality of acoustic signals transmitted through the barrier to a respective plurality of electrical waveforms. A second bonding layer (120B) bonds a barrier mounting surface of the body of the second transceiver to the barrier.

Continuous processing equipment is suitable for use in the preparation of elastomeric compositions from end-of-life tire crumb or other vulcanized rubber starting materials. A reactor includes an outer barrel, a first shaft and a second shaft, and one or more piezoelectric transducer-driven acoustic horns arranged along the outer barrel and penetrating the outer barrel through a series of vibration-isolated ports which traverse a jacket of the outer barrel.

Disclosed herein are ultrasonic transducer systems comprising: an ultrasonic imager comprising a plurality of pMUT transducer elements; and one or more circuitries connected electronically to the plurality of transducer element, the one or more circuitries configured to enable: pulse transmission and reception of reflected signal for the ultrasonic transducer, where inductors are used to equalize impedance to obtain greater pressure output. Also disclosed are methods of altering a pressure of an ultrasonic wave emitted by an ultrasonic transducer.

Disclosed herein are acoustic transmission systems comprising an acoustic wave generator configured to generate an acoustic wave and propagate the acoustic wave through a tissue of a specimen, and a non-Hermitian complementary metamaterial (NHCMM) configured to add a first amount of energy amplification coherently to the acoustic wave to account for energy loss in the acoustic wave as a result of the wave propagating through the tissue of the specimen. The acoustic wave generator can be an ultrasound generator, and the tissue can be a cranium.

Ultrasonic transmitting elements in an electroacoustical transceiver transmit acoustic energy to an electroacoustical transponder, which includes ultrasonic receiving elements to convert the acoustic energy into electrical power for the purposes of powering one or more sensors that are electrically coupled to the electroacoustical transponder. The electroacoustical transponder transmits data collected by the sensor(s) back to the electroacoustical transceiver wirelessly, such as through impedance modulation or electromagnetic waves. A feedback control loop can be used to adjust system parameters so that the electroacoustical transponder operates at an impedance minimum. An implementation of the system can be used to collect data in a vehicle, such as the tire air pressure. Another implementation of the system can be used to collect data in remote locations, such as in pipes, enclosures, in wells, or in bodies of water.

An ultrasonic transducer, including a piezoelectric element with physical characteristics of radial resonant frequencies and thickness resonant frequencies, and with an upper surface and a lower surface opposite to each other through the piezoelectric element and a lateral surface connecting the upper surface and the lower surface, and an acoustic matching layer set on the upper surface of the piezoelectric element and having a first resonant matching part and a second resonant matching part, wherein a thickness of the first resonant matching part in a direction perpendicular to the upper surface is greater than a thickness of the second resonant matching part in the direction, and the thickness of the first resonant matching part matches one radial resonant frequency of the piezoelectric element and the thickness of the second resonant matching part matches another radial resonant frequency or one of the thickness resonant frequency of the piezoelectric element.

Disclosed herein are ultrasonic transducer systems comprising: an ultrasonic imager comprising a plurality of pMUT transducer elements; and one or more circuitries connected electronically to the plurality of transducer element, the one or more circuitries configured to enable: pulse transmission and reception of reflected signal for the ultrasonic transducer, where inductors are used to equalize impedance to obtain greater pressure output. Also disclosed are methods of altering a pressure of an ultrasonic wave emitted by an ultrasonic transducer.

An ultrasonic horn includes: a vertical vibration generating portion in which a first ultrasonic vibrator is mounted inside; a horn portion extending forward from the vertical vibration generating portion , amplifying an ultrasonic vibration generated by the vertical vibration generating portion , and to which a capillary is mounted at a front end portion ; and a torsional vibration generating portion extending rearward from the vertical vibration generating portion . The torsional vibration generating portion includes: a rod-shaped body ; vibration members arranged axisymmetrically around a central axis ; second ultrasonic vibrators sandwiched between the rod-shaped body and the vibration members such that a vibration direction is a circumferential direction; and bolts pressurizing the second ultrasonic vibrators.