PIEZOELECTRICPIEZOELECTRIC PRESSUREPRESSURE TRANSDUCERTRANSDUCER

TRANSDUCERSTRANSDUCERSA TRANSDUCER MAY BE DEFINED AS A DEVICE THAT CONVERTS ENERGY FROM A TRANSDUCER MAY BE DEFINED AS A DEVICE THAT CONVERTS ENERGY FROM

ONE FORM TO ANOTHER FORM.ONE FORM TO ANOTHER FORM.

ENERGY TRANSMISION CAN BE ELECTRICAL , MECHANICAL , CHEMICAL B, ENERGY TRANSMISION CAN BE ELECTRICAL , MECHANICAL , CHEMICAL B,

OPTICAL , THERMAL , NUCLEAR , ACOUSTICAL OR A COMBINATION OF ANY OPTICAL , THERMAL , NUCLEAR , ACOUSTICAL OR A COMBINATION OF ANY

TWO OR MORE .TWO OR MORE .

IT IS OFTEN VERY CONVENIENT TO MAKE MEASUREMENTS IN TERMS OF IT IS OFTEN VERY CONVENIENT TO MAKE MEASUREMENTS IN TERMS OF

ELECTRICAL QUANTITIES SUCH AS VOLTAGE OR CURRENT AND EASE IN ELECTRICAL QUANTITIES SUCH AS VOLTAGE OR CURRENT AND EASE IN

RECORDING,STORING ,AND TRANSMISSION OF THESE ELECTRICAL RECORDING,STORING ,AND TRANSMISSION OF THESE ELECTRICAL

QUANTITIES.QUANTITIES.

PIEZOELECTRIC PRESSURE PIEZOELECTRIC PRESSURE TRANSDUCERSTRANSDUCERS

• THESE DEVICE UTILIZE THE PIEZOELECTRIC THESE DEVICE UTILIZE THE PIEZOELECTRIC

CHARACTERISTICS OF CERTAIN CRYSTALLINE CHARACTERISTICS OF CERTAIN CRYSTALLINE

AND CERAMIC MATERIALS (SUCH AS QUARTZ) AND CERAMIC MATERIALS (SUCH AS QUARTZ)

TO GENERATE AN ELECTRICAL SIGNAL.TO GENERATE AN ELECTRICAL SIGNAL.

PRINCIPLEPRINCIPLE

WHEN PRESSURE IS APPLIED ON CRYSTAL , AN ELECTRICAL CHARGE IS GENERATED.

SOME OF THE PIEZOELECTRIC MATERIALS ARE BARRIUM TITANATE SINTERED POWDER , CRYSTAL OF QUARTZ , TOURMALINE, AND ROCHELLE SALTS.

CONSTRUCTION AND WORKINGCONSTRUCTION AND WORKING

oCONSTRUCTION CONSTRUCTION IT CONSISTS OF A DIAPHRAGM BY WHICH PRESSURE IS IT CONSISTS OF A DIAPHRAGM BY WHICH PRESSURE IS

TRANSMITTED TO THE PIEZOELECTRIC CRYSTAL Y1. THIS TRANSMITTED TO THE PIEZOELECTRIC CRYSTAL Y1. THIS

CRYSTAL GENERATES AN ELECTRICAL SIGNAL WHICH IS CRYSTAL GENERATES AN ELECTRICAL SIGNAL WHICH IS

AMPLIFIED BY A CHARGE AMPLIFIER.AMPLIFIED BY A CHARGE AMPLIFIER.

A 2A 2NDND PIEZOELECTRIC CRYSTAL Y2 IS INCLUDED TO COMPENSATE PIEZOELECTRIC CRYSTAL Y2 IS INCLUDED TO COMPENSATE

FOR ANY ACCELERATION OF THE DEVICE DURING USEFOR ANY ACCELERATION OF THE DEVICE DURING USE..

APPLICATIONSAPPLICATIONS

  PRESSURE SENSOR IN THE TOUCH PADS OF MOBILE PRESSURE SENSOR IN THE TOUCH PADS OF MOBILE

PHONES.PHONES.

TO MEASURE PRESSURE INSIDE THE CYLINDER OF TO MEASURE PRESSURE INSIDE THE CYLINDER OF

GASOLINE ENGINE.GASOLINE ENGINE.

IN VARIOUS APPLICATION SUCH AS IN VARIOUS APPLICATION SUCH AS

MEDICAL ,AEROSPACE , NUCLEAR INSTRUMENTATION.MEDICAL ,AEROSPACE , NUCLEAR INSTRUMENTATION.

ADVANTAGESADVANTAGES

I.I. THE TRANSDUCER NEEDS NO EXTERNAL POWER AND IS THE TRANSDUCER NEEDS NO EXTERNAL POWER AND IS THEREFORE SELF GENERATING.THEREFORE SELF GENERATING.

II.II. IT HAS A VERY GOOD HIGH FREQUENCY RESPONSE.IT HAS A VERY GOOD HIGH FREQUENCY RESPONSE.

III.III. THOUGH PIEZOELECTRIC SENSORS ARE THOUGH PIEZOELECTRIC SENSORS ARE ELECTROMECHANICAL SYSTEMS THAT REACT ELECTROMECHANICAL SYSTEMS THAT REACT TO COMPRESSION , THE SENSING ELEMENTS SHOW TO COMPRESSION , THE SENSING ELEMENTS SHOW ALMOST ZERO DEFLECTION.ALMOST ZERO DEFLECTION.

DISADVANTAGESDISADVANTAGES

I.I. THIS TYPE OF TRANSDUCER CANNOT MEASURE STATIC THIS TYPE OF TRANSDUCER CANNOT MEASURE STATIC

PRESSURE.PRESSURE.

II.II. THE OUTPUT OF THE TRANSDUCER IS AFFECTED BY THE OUTPUT OF THE TRANSDUCER IS AFFECTED BY

CHANGES IN TEMPERATURE. THEREFORE TEMPERATURE CHANGES IN TEMPERATURE. THEREFORE TEMPERATURE

COMPENSATING DEVICES HAS TO BE USED.COMPENSATING DEVICES HAS TO BE USED.