Piezoelectric Resonators and Their Applications by Jiri Zelenka

Abstract

Analysis is made of nonlinear underwater apparatus with account being taken of the real properties of the medium. A comparison is given of the experimental and theoretical data over the spatial distributions, frequencies, amplitudes, and phase characteristics of parametric transmitters and receivers. For convenience of engineering calculations, nomograms are presented that allow choice of parameters for nonlinear arrays. Features of construction are given, and the basic characteristics of both Soviet and foreign parametric arrays are described.For scientific investigations, parametric arrays have been designed for tank and test stations, precision sonar, fish detection, underwater sonar for shelf zones, transfer of broadband information in underwater sound channels, parametric Doppler sonar and acoustic recorders, geolocation, cartography through a water layer, etc. The book not only gives the theory underlying these developments, but it also gives design criteria that can be used in the design of other types of underwater parametric arrays as well as data taken from such systems. It is a thorough discussion of the subject. Although individual authors wrote specific chapters

Electrical Frequency Tuning of Film Bulk Acoustic Resonator

“…Ignoring the effects of (that represents the dielectric loss in the piezoelectric film), series resistance , and parasitic capacitance , we get the intrinsic quality factor of an FBAR without any series capacitor connected and the quality factors (10) ( and ) of an FBAR connected with a capacitor in series as follows [20]:…”

Piezoelectric and Elastic Properties of γ-Irradiated Gadolinium Calcium Oxoborate, GdCa4O(BO3)3, Single Crystal

“…The frequency f r related to the minimum of absolute value of impedance is named the resonance frequency and the frequency f a associated to the maximum of absolute impedance value is known as the antiresonance frequency [7,13,14]. One can notice the shift of both resonance and antiresonance frequencies for the irradiated samples but the direction of the changes in the investigated crystal cuts is opposite.…”

Pulse Driving of Piezoceramic Actuators and Their Present Technical Limitations

“…The choice of the driver depends on the design of the piezoelectric motor and on the requirements how to control the motor as well. To achieve the maximal efficiency the driving signal for the vibrating element (a piezoelectric resonator) should be a harmonic wave with minimal harmonic distortion (minimal content of harmonic components in its frequency spectrum) [3]. The motor drivers can be divided to two main groups according to the signal source on their output.…”