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1、TransducerDevicewhenactivatedfromoneformenergyconvertedtoanotherquantityorDevicewhichconvertsonephysicalquantityorconditiontoanotherPhysicalquantity–heat,intensityoflight,flowrate,liquidlevel,humidityetcSensor:sensephysicalquantityClassificationoftransducersBasedonprincip

2、leoftransductionActive&passiveAnalog&digitalInversetransducerBasedonprincipleusedThermoelectricMagnetoresistiveElectrokineticOpticalPassivetransducerDevicewhichderivepowerreqd.fortransductionfromauxiliarypowersource-externallypoweredEg:resistive,inductive,capacitiveWithou

3、tpowertheywillnotworkActivetransducerNoextrapowerreqd.toproduceI/pSelfgeneratingDrawpowerfrominputappliedEg.Piezoelectricx’talusedforaccelartionmeasurementAnalogtransducerconvertI/pquantityintoananalogo/pAnalogo/p-acontinuousfn.OftimeEg.Straingauge,LVDT,thermocoupleDigita

4、ltransducerConvertsI/pintoanelectricalo/pintheformofpulsesInversetransducerWhichconvertselectricalsignaltophysicalquantityTransducerforpressuremeasurementWhatispressure?force/unitareaUnit–(N/sq.m)PaPressuremeasuredcanbeabsolute,gaugeordifferentialdependingontypeofreferenc

5、eTypesofpressuretransducersGravitationaleg:manometerElastic–forceconvertedtostraineg.Diaphragm,capsule,bellows,bourdontubesDiaphragmCommonpressuresensingelasticelementThincircularplatestretched&fastenedatitsperipheryMadeofelasticalloysofbronze,phosphorbronze,stainlessstee

6、loralloyslikeMonel,Nickelspan-CStructure–flatorcorrugatedTopviewofflattypeTopviewofcorrugatedtypeFlattype–highnaturalfrequencyCorrugated–forlargedeflectionsCapsuleCapsuleTwocorrugatedmetaldiaphragmssealedtogetheratperipheryFormsashelllikestructureOnediaphragmhasaportatcen

7、tretoadmitpressuretobemeasuredOtherdiaphragmlinkedtoamoveablemechanicalpart.CapsuleDisplacementproportionaltodifferenceb/wouter&innerpressure.BourdontubescurvedortwistedmetallictubeswithellipticalcrosssectionSealedatoneendTendstostraightenwhenpressureapplied.Angularsensit

8、ivityproportionaltopressureappliedSpirialbourdontubesBourdontubes–CtypeHelicaltypeTubeintheformo