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PIEZOELECTRIC

PRESSURE

TRANSDUCER

Karen BastidasDiana Gaitn

Diego RaAna Ruz

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GO TO .

CONCEP

TS

INTRODUCT

ION

EFFECTMATERIA

LS

APPLICATIO

NS

PARTS

ADVANTA

GES

DISADVANTA

GES

!

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ETHIMOLOGY

Piezo is derived from theGreek word piezein, tosqueeze.

Piezoelectric materials

produce a voltage whenstrained.

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TRANSDUCER

A device that converts a signal from a signalcorresponding physical form but otherwise physicallydifferent.

Pressure

Voltage

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PRESSURE

TRANSDUCERSensor

Electrical signals

Measure

pressure

Acceleration

stress

force

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PRINCIPLE OF

OPERATION

Coil

Condenser

Resistance

Voltage source

The voltage is directlyproportional to the force,pressure.

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PIEZOELECTRIC

EFFECT

Discovered in thenineteenthcentury byJacques andPierre Curie

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PIEZOELECTRIC

EFFECT

When pressure is applied to a material it createsstrain or deformation in the material, this strain

creates an electrical potential difference.

Pressure Voltage

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PIEZOELECTRIC

EFFECT

The piezoelectric effectis found in materials with

a specific electrical

crystalline structure.

Quartz

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A piezoelectric material cannot be isotropic, or identicalin all directions.

Natural materials

PIEZOELECTRIC

MATERIALS

Quartz Tourmaline

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PIEZOELECTRIC

MATERIALSSynthetic materials

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The material isisotropic and yieldsno resultant electricpolarization when a

force is applied.

PIEZOELECTRIC

MATERIALS

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Both materials yieldparallel andperpendicularpolarizations

respectively when aforce is applied.

PIEZOELECTRIC

MATERIALS

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PARTS

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APPLICATIONS

Ultrasonic transmitters and receivers.

Accelerometers

Microphones and loudspeakers

Force sensor

ent of airbags.

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APPLICATIONS

Dynamic measurement of cylinder pressureand fuel injection pressure in the developmentof internal combustion engines.

Continuous monitoring of cylinder pressures inlarge diesel engines.

Measurement of explosion pressures in thedevelopment of air bags.

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ADVANTAGESLow cost

High sensitivity

High mechanical stiffness

Broad frequency range

Small size

High modulus of elasticity of many piezoelectric materials.

The piezoelectric technology is insensitive to electromagnetic fields andradiation, enabling measurements under adverse conditions.

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Elevated temperatures and very high pressures cause

an additional failure in the internal resistance and the

sensitivity of the measurement.

DISADVANTAGES

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THE MECHANISM FOR THE ESTERIFICATION REACTION.[enlnea]. http://www.chemguide.co.uk/physical/catalysis/esterify.html[citado en 23 de octubre de 2011]

ESTERIFICACIN. [en lnea].http://www.plantasquimicas.com/Procesunit/Ester.htm[citado en 23 de octubre de 2011]

LOS ESTERES. [en lnea]. http://www.galeon.com/cheko/fisicas.html[citado en 23 de octubre de 2011]

ESTERES. [en lnea].http://www.quimicaorganica.org/esteres/nomenclatura-de-esteres.html

[citado en 23 de octubre de 2011]

BIBLIOGRAPHY

http://www.chemguide.co.uk/physical/catalysis/esterify.htmlhttp://www.plantasquimicas.com/Procesunit/Ester.htmhttp://www.plantasquimicas.com/Procesunit/Ester.htmhttp://www.plantasquimicas.com/Procesunit/Ester.htmhttp://www.plantasquimicas.com/Procesunit/Ester.htmhttp://www.chemguide.co.uk/physical/catalysis/esterify.htmlhttp://www.chemguide.co.uk/physical/catalysis/esterify.htmlhttp://www.chemguide.co.uk/physical/catalysis/esterify.html

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