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]
(electronics)
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 ?
Output voltage of the piezoelectric transducer excited by the momentum of the electrical motor.
To determine optimal parameters related to geometry and stiffness of individual components of piezoelectric transducer under analysis, a method of multi-object optimization--GRA (Grey Relational Analysis) was selected.
[32.] Filoux, E., Calle, S., Certon, D., Lethiecq, M., and Levassort, F., "Modeling of piezoelectric transducers with combined pseudospectral and finite-difference methods," J.
After having comparative analysis of pressure results through copper crusher and piezoelectric transducer at 25 mm (NATO specified for chamber pressure vide drawing 6 in NATO MANUAL MOPI as shown in Figure 7), having observed that piezo pressure is more accurate, the case mouth pressure (at 54 mm from chamber end vide drawing b-35 in NATO MANUAL MOPI as shown in Figure 3) as specified in NATO EPVAT system (MOPI NATO 7.62 mm ammunition) is even more accurate and closer to true pressure.
These input characteristic parameters from Table 1 were incorporated in the MATLAB script that incorporates (1), (2), and (5) to estimate the power generation from one piezoelectric transducer device.
After measuring the stapes displacement under acoustic stimulation, the piezoelectric transducer was attached to the incus body as shown in Figure 4 with epoxy resin.
A piezoelectric transducer circuit is shown to demonstrate the process better.
This switching technique stores the electric charge in the piezoelectric transducer rather than allowing it to be dissipated, increasing the magnitude of [V.sub.p] and thus increasing the force generated by the piezoelectric transducer to suppress the vibration.
When the buoyancy and velocity capture principles both work on these particles, perceptible kinetic impact occurs on the piezoelectric transducer (400ET180) placed close to one of the two exhaust inlets of the range hood.
Contained within the tag are two miniature 0.2 Farad ultra-high-capacity, energy-storage capacitors, which provide power to the tag, a circular inductive coil used to recharge the tag, and a piezoelectric transducer for transmitting data acoustically and high and low pass filters.
It uses a piezoelectric transducer that turns a threaded shaft for fine adjustments.
To make the device more sensitive, a piezoelectric transducer is connected to the fiber coil.