Piezoelectric Transducer

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Related to Piezoelectric Transducer: piezoelectric effect, piezoelectric crystal

piezoelectric transducer

[pē¦ā·zō·ə′lek·trik tranz′dü·sər]
A piezoelectric crystal used as a transducer, either to convert mechanical or acoustical signals to electric signals, as in a microphone, or vice versa, as in ultrasonic metal inspection.

Piezoelectric Transducer


a measuring transducer that converts mechanical stress into an electric signal. Its operation is based on the piezoelectric effect. One of designs of a piezoelectric pressure transducer is shown in Figure 1. Under the action of the pressure being measured, electric charges appear on the external and internal sides of a pair of plates made of a piezoelectric material. The total electromotive force between the output terminal and the housing varies in proportion to the pressure.

Figure 1. Diagram of a piezoelectric pressure transducer: (p) pressure to be measured, (1) plates of piezoelectric material, (2) dielectric material, (3) electric terminal, (4) housing that serves as a second terminal, (5) insulator, (6) metallic electrode

Piezoelectric transducers are well suited for measuring rapidly varying pressures. When the pressure varies slowly, however, there is an increase in error due to leakage of electric charge from the plates to the housing. The error can be reduced by connecting an additional capacitor in parallel to the transducer, but this reduces the voltage at the output terminals. The main advantages of piezoelectric transducers are their high dynamic characteristics and their ability to sense pressure oscillations at frequencies from tens of hertz to tens of megahertz. Piezoelectric transducers are used in the measurement of strain, vibration, and deformation; they also find application in apparatus for weighing and for sorting according to weight.

References in periodicals archive ?
Outside ring is contacting with the plate of piezoelectric transducer 3 (having the polarisation vector perpendicular to the plate) through the intermediate frictional element 4.
A piezoelectric transducer circuit is shown to demonstrate the process better.
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The possibility of designing and produce the piezoelectric transducer with any shape, suitable for the application is also important as well as simplicity of this type of systems, especially in case of passive vibration damping.
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These electrical signals are then amplified and filtered by a "pacemaker-like" sound processor and transmitted to a second piezoelectric transducer that stimulates the inner ear naturally, and with significantly greater efficiency than acoustic devices.
The piezoelectric transducers are used for accurate and repeatable measurement for all pressure ranges and most temperature applications such as oil and gas services, steel production, injection molding, die casting, and chemical production.