Transducers

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Transducers

  1. 1. CONTENTS WHAT IS TRANSDUCER ELECTRICAL TRANSDUCER CLASSIFICATION OF TRANSDUCERS SELECTION CRITERIA OF THE TRANSDUCERS BASIC CONSTRUCTION OF TRANSDUCERS RESISTANCE TEMPERATURE DETECTOR THERMISTORS LVDT RVDT STRAIN GUAGE BOURDON TUBE APPLICATIONS,ADVATAGES AND DISADVANTAGES
  2. 2. WHAT IS TRANSDUCER The transducer is defined as the device which convert the one form of energy into another form of the energyExample: Temperature transducers Thermocouples Resistance-Temperature Detectors (RTD) Thermistors Resistive position transducers Displacement transducers Strain gauge
  3. 3. ELECTRICAL TRANSDUCERS The electrical transducers is one which converts the non- electrical quantity into the equivalent electrical quantity. Non-electrical quantity such as force, displacement, stress, temperature. Electrical quantity such as current , voltage
  4. 4. CLASSIFICATION OFTRANSDUCERSOn the basis of transduction form used.As primary and secondary transducers.As passive and active transducers.As analog and digital transducers.As transducers and inverse transducers
  5. 5. On the basis of transduction form usedResistive Transducers.Capacitive Transducers.Inductive Transducers.Voltage and current Generating Transducers.
  6. 6. Primary and secondary transducersExampleLVDT and bourdon tube
  7. 7. Passive and Active TransducersIf transducers derive the power require for transduction from an power source, then this kind of transducer are known as passive transducerExampleLVDTRVDT
  8. 8. CONT… When there is no need for any source then these type of transducers are Active transducersExample are : Thermocouple Piezoelectric crystal
  9. 9. THERMOCOUPLE
  10. 10. TYPES OF THERMOCOUPLE
  11. 11. Piezoelectric crystal Quartz ,Rochelle salt, Lithium sulphate or barium titanate.
  12. 12. Inverse Transducers These type of transducers convert a electrical quantity into non-electrical quantityExample Piezoelectric crystal Analog ammeter voltmeter
  13. 13. SELECTION CRITERIA OF THETRANSDUCERSOperating principleSensitivityOperating rangeAccuracyErrorsEnvironmental capabilityInsensitive to unwanted SignalStability
  14. 14. BASIC CONSTRUCTION OFTRANSDUCERSIt consist of two important parts Sensing element. Transduction element.
  15. 15. RESISTANCE TEMPERATUREDETECTOR
  16. 16. THERMISTORS Thermistors are used for the measurement of precision temperature
  17. 17. Cont…
  18. 18. LVDT
  19. 19. Cont…
  20. 20. RVDT
  21. 21. STRAIN GAUGE It works on Piezoresistive effect. These are used for measurement of stress and strain If an elastic material is subjected to tension then its resistance changes.
  22. 22. BOURDEN TUBECurved metallic tubes withElliptical cross section Sealed at one end Tends to straighten when pressure applied. Angular sensitivity proportional to pressure applied
  23. 23. BOURDEN TUBE
  24. 24. APPLICATIONAudio/video equipmentPressure indicationMeasurement of displacementAlarms
  25. 25. ADVANTAGESPower requirement is very low for controlling the electrical or electronic system.Output can be indicated and recorded remotely from the sensing element.Electrical amplification and attenuation can be easily done.An amplifier may be used to amplify the electrical signal according to requirement.
  26. 26. DISADVANTAGESRTD produce mechanical vibrationsTheir cost is highThermistors are unsuitable for wide temperatureRelative large displacement is required for appreciable output for LVDTBourdon tubes do not provide the precise measurement.
  27. 27. CONCLUSIONTransducers are used to convert one form energy to another.All the transducers are very useful in all the application such as microphone , speaker etc.
  28. 28. REFERENCEShttp:/123seminarsonly.com/Latest-Seminar- Topics/Latest-Seminar-Topics-021.htmlFrom A.k .Sawhney/3rd sem/chapter5/Pageno.5.1- 5.187http://en.wikipedia.org/wiki/Transducer

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