Power amplifier for piezoelectric transducers

• Grant number: 12/07639-4
• Support Opportunities: Regular Research Grants
• Start date: August 01, 2012
• End date: July 31, 2014
• Field of knowledge: Engineering - Electrical Engineering - Electrical, Magnetic and Electronic Measurements, Instrumentation
• Principal Investigator: Francisco José Arnold
• Grantee: Francisco José Arnold
• Host Institution: Faculdade de Tecnologia (FT). Universidade Estadual de Campinas (UNICAMP). Limeira , SP, Brazil

Abstract

The piezoelectric transducers are devices widely used in various technological applications. Many equipment and scientific instruments have functional principle based on mechanical micrometric displacement promoted by piezoelectric transducers, in areas ranging from nano and micro positioners, high voltage generators, headphones, welding equipment, sonar, cell disruptors, liquid atomizers and medical echographs.Many of these applications use piezoelectric transducers to produce mechanical vibration at ultrasonic frequencies, and in most cases the efficiency of the vibrating element is strongly dependent on the resonance of the mechanical parts involved, particularly in the case of processes involving high power. In such cases it is of great value that the transducer electric excitation circuitry can detect the resonance condition and automatically adjust the excitation frequency to the mechanical resonance, so as to maintain the maximum efficiency of the transducer in its various operating conditions even when changes occur in the mechanical parts involved.This project proposes the development of a bench for the drive, the definition of resonances, the evaluation and the correction of the operating frequency of ultrasonic piezoelectric transducers under different power conditions. As expected results, this project should enable the realization of multidisciplinary studies of power ultrasound and the development of instrumentation for the characterization of piezoelectric ultrasonic transducers at high powers. (AU)

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ARNOLD, FRANCISCO JOSE; GONCALVES, MARCOS SERGIO; MASSARO JUNIOR, FLAVIO RUBENS; MARTINS, PAULO SERGIO. Complex elastic coefficient and mechanical losses for piezoelectric resonators under transversal and thickness modes. Ferroelectrics, v. 504, n. 1, p. 104-115, 2016. (11/12792-3, 12/07639-4)

NASCIMENTO, VINICIUS A.; XIMENES, RODRIGO L.; ARNOLD, FRANCISCO J.. An experimental study of the influence of the temperature rising on the performance of a piezoelectric ceramic employed in ultrasonic baths. Ferroelectrics, v. 603, n. 1, p. 12-pg., 2023-01-25. (12/07639-4)

VERRATI, THIAGO G.; ARNOLD, FRANCISCO J.. An experimental study of the effects of the acoustical load on the piezoelectric transducers performance. Ferroelectrics, v. 568, n. 1, p. 112-122, NOV 17 2020. (12/07639-4)

ARNOLD, FRANCISCO J.; MARTINS, PAULO S.. New insights into the mechanical pre-stressing of piezotransducers. Journal of Intelligent Material Systems and Structures, v. 32, n. 8, p. 867-879, MAY 2021. (12/07639-4)