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Piezo-electric Transducer

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This ppt. describes about the construction & working of a piezoelectric transducer in short.

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Piezo-electric Transducer

  1. 1. PIEZOELECTRIC PRESSURE TRANSDUCER
  2. 2.  TRANSDUCERS A TRANSDUCER MAY BE DEFINED AS A DEVICE THAT CONVERTS ENERGY FROM ONE FORM TO ANOTHER FORM. ENERGY TRANSMISION CAN BE ELECTRICAL , MECHANICAL , CHEMICAL B, OPTICAL , THERMAL , NUCLEAR , ACOUSTICAL OR A COMBINATION OF ANY TWO OR MORE . IT IS OFTEN VERY CONVENIENT TO MAKE MEASUREMENTS IN TERMS OF ELECTRICAL QUANTITIES SUCH AS VOLTAGE OR CURRENT AND EASE IN
  3. 3.  PIEZOELECTRIC PRESSURE TRANSDUCERS • THESE DEVICE UTILIZE THE PIEZOELECTRIC CHARACTERISTICS OF CERTAIN CRYSTALLINE AND CERAMIC MATERIALS (SUCH AS QUARTZ) TO GENERATE AN ELECTRICAL SIGNAL.
  4. 4.  PRINCIPLE 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.
  5. 5.  CONSTRUCTION AND WORKING oCONSTRUCTION  IT CONSISTS OF A DIAPHRAGM BY WHICH PRESSURE IS TRANSMITTED TO THE PIEZOELECTRIC CRYSTAL Y1. THIS CRYSTAL GENERATES AN ELECTRICAL SIGNAL WHICH IS AMPLIFIED BY A CHARGE AMPLIFIER.  A 2ND PIEZOELECTRIC CRYSTAL Y2 IS INCLUDED TO
  6. 6.  APPLICATIONS  PRESSURE SENSOR IN THE TOUCH PADS OF MOBILE PHONES. TO MEASURE PRESSURE INSIDE THE CYLINDER OF GASOLINE ENGINE. IN VARIOUS APPLICATION SUCH AS MEDICAL ,AEROSPACE , NUCLEAR INSTRUMENTATION.
  7. 7.  ADVANTAGES I. THE TRANSDUCER NEEDS NO EXTERNAL POWER AND IS THEREFORE SELF GENERATING. II. IT HAS A VERY GOOD HIGH FREQUENCY RESPONSE. III. THOUGH PIEZOELECTRIC SENSORS ARE ELECTROMECHANICAL SYSTEMS THAT REACT TO COMPRESSION , THE SENSING ELEMENTS SHOW ALMOST ZERO DEFLECTION.
  8. 8.  DISADVANTAGES I. THIS TYPE OF TRANSDUCER CANNOT MEASURE STATIC PRESSURE. II. THE OUTPUT OF THE TRANSDUCER IS AFFECTED BY CHANGES IN TEMPERATURE. THEREFORE TEMPERATURE COMPENSATING DEVICES HAS TO BE USED.
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This ppt. describes about the construction & working of a piezoelectric transducer in short.

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