This paper presents an ultrasound piezoceramic transducer, centred into an extracorporeal shock wave lithotriptor system. The electromagnetic acoustic source lithotriptor initiates the incident shock waves into the water, and the ultrasound transducer improves caviational effects of the bubbles. The piezoelectric transducer is powered by a Function/Pulse Generator type IWATSU SG-4511, and converts the electrical signal in mechanical vibrations, which

An unconventional synthesis method, implying ultrasonic field, was tested in order to improve the properties of CaCO3 precipitated via liquid-liquid route. Working parameters for calcium carbonate precipitation in the absence of ultrasonic field so that the solid material displays aragonite morphology were established. The evolution of the precipitation reaction in ultrasonic field provided a solid phase with aragonite morphology slightly impurified

The paper presents the main characteristics of two types of bimorph actuators, such as: PZT and piezoelectric PVDF. Two PZT thick plates about 0.3 mm thickness where fixed together and in between a metallic brass plate as positive electrode. An important result is that the PZT bimorph transducer starts vibrating at low alternative voltage about 5 V, developing more than 2 mm aperture displacement at the plates end. PVDF pre-polarized piezoelectric

The paper presents aspects concerning the design and achievement of an ultrasound piezoceramic transducer for medical applications. The structure of piezoceramic transducer vibrates at certain acoustic intensity andwork frequency between 800 kHz and 1 MHz and ultrasound vibrations propagate into biologic tissue. The piezoceramic disc converts the electrical energy into a vibratory mechanical one and the ultrasound energy is propagated into the biological

This paper presents a study of cavitation role in the disintegration of urinary calculi generated by a modified extracorporeal shock wave lithotripsy (ESWL) system. The ElectroMagnetic Acoustic Source of a Lithostar lithotripter initiated the incident shock waves into the water, and the ultrasound transducer fixed into the system provided an important role by enhancing the cavitation effects of the bubbles in the Calcium-silicate target fragmentation.

Lead titanate (PbTiO3) powders in tetragonal form have been successfully prepared by sol-gel method. The processing of lead titanate ceramics was followed up using techniques such as: X-ray diffraction (XRD), thermal analysis (DSC) and microscopy (SEM). Three lead titanate powders have been obtained in different conditions function of annealing temperature and ultrasound field. The sol-gel process may be improved by ultrasound gel irradiation in

Review paper: This paper reviews the basic characteristics and progress in the sol-gel method for preparation of piezoelectric ceramic powders and ferroelectric thin films. Also some techniques for characterization of the advanced ceramic powders and thin films are reported. Their multiple domains of applications present the importance of the ferroelectric thin films.

This paper presents theoretical and experimental research for the design and manufacture of an underwater flextensional piezoceramic sandwich transducer (FPST) for applications in underwater acoustics transmission at long distances. The emitting transducer can generate an ultrasonic field into the water medium. The active element of the high-power ultrasonic piezoceramic transducer is a stack realized with piezoceramic tores and metallic cylinders.