TRANSDUCER (Engineering metrology and instrumentation)

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DIGITAL TRANSDUSER,STRAIN GUAGE

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TRANSDUCER (Engineering metrology and instrumentation)

  1. 1. DEPARTMENT OF MECHANICAL ENGINEERING
  2. 2. PRESENTED BY SABEER HUSAIN
  3. 3. ENGINEERING METROLOGY AND INSTRUMENTATION
  4. 4. INTRODUCTION ‘Transducer' is 'a device that transfers power from one system to another in the same or in the different form'.
  5. 5. DEFINING A TRANSDUCER Device that converts one type of energy or signal into another Examples.. • A microphone is a transducer that converts sound waves into electric impulse. • An electric motor is a transducer that converts electricity into mechanical energy.
  6. 6. Important Points • Transducers are widely used in measuring instruments. • Sensors have an important role in transducer. • Sensor is used to detect a parameter in one form and report it in another form of energy. • Most of the transducer either convert electrical energy into mechanical or convert non electrical physical quantity to an electrical signals.
  7. 7. Types of Transducers •Electronic Transducers •Resistance Transducer •Variable Reluctance Transducer •Capacitive Transducer •Piezo-Electronic Transducer •Thermo-Electric Transducer •Photoelectric Transducer •Direct digital Transducer •Fiber optic Transducer
  8. 8. Application: •Electromagnetic- Antenna(converts propagating electromagnetic waves) •Galvanometer •Rotor meter •Accelerometer •Airflow sensors •Fluorescent lamp •Loudspeakers
  9. 9. Direct Digital Transducer
  10. 10. INTRODUCTION A transducer which measures physical quantity and transmits the information as coded digital signal is known as a ‘ Direct Digital Transducer’.
  11. 11. Most transducers used in digital systems are primarily analogue in nature They are incorporated with some form of conversion to provide the digital output.  Provides o/p signal in the form of rectangular pulses of constant duration and amplitude. Measures physical quantities and transmits the information as coded. Most of the signals are continuously varying currents.
  12. 12. Advantages •Provides ease of generating •Ease of manipulating •Strong digital signals •Great accuracy and discrimination •Gives simplified data presentation •It supports high level digital signal to external disturbances so transmitting signal over long is possible
  13. 13. Strain Gauge
  14. 14. Introduction A Strain Gauge is a device used to measure strain on an object. •It converts force, pressure, tension, weight, etc., into a change in electrical resistance which can then be measured.
  15. 15. Principle When a metal conductor is stretched or compressed, Its resistance will also get changed. •Note Works based on electrical measurement technique. Types of strain gauge •Wire wound strain gauge •Foil type strain gauge •Semiconductor strain gauge •Capacitive strain gauge
  16. 16. Working •Consist of a insulating flexible backing which supports metallic foil pattern. • The gauge is attached to suitable adhesive called cyanoacrylate. •As the object is deformed the foil is deformed, causing the electrical resistance to change. •It converts force, pressure, tension, weight etc into a into electrical resistance which can then be measured in desired quantities.
  17. 17. Applications •These gauges have a high gauge factor •Excellent hysteresis characteristics Disadvantages •Gauges are very sensitive to changes in temperature •Linearity of these gauges is poor

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