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1、DevelopmentofSensNewTechnologySensisonekindcomponentwhichcantransfmthephysicalquantitychemistryquantitythebiomassintoelectricalsignal.Theoutputsignalhasthedifferentfmslikethevoltagetheelectriccurrentthefrequencythepulses

2、oonwhichcansatisfythesignaltransmissionprocessingrecdingdemonstrationcontroldems.Soitistheautomaticdetectionsystemintheautomaticcontrolindustry.IfautomaticTechnologyisusedwiderthensensismeimptant.Severalkeywdsofthesens：1

3、SensElementsAlthoughthereareexceptionmostsensconsistofasensingelementaconversioncontrolelement.Fexamplediaphragmsbellowsstraintubesringsbourdontubescantileversaresensingelementswhichrespondtochangesinpressurefceconvertth

4、esephysicalquantitiesintoadisplacement.Thisdisplacementmaythenbeusedtochangeanelectricalparametersuchasvoltageresistancecapacitanceinductance.Suchcombinationofmechanicalelectricalelementsfmelectromechanicaltransducingdev

5、icessens.Similarcombinationcanbemadefotherenergyinputsuchasthermal.Photomagicchemicalgivingthermoelectricphotoelectricelectromaaicelectrochemicalsensrespectively.2SensSensitivityTherelationshipbetweenthemeasuredthesensou

6、tputsignalisusuallyobtainedbycalibrationtestsisreferredtoasthesenssensitivityK1=outputsignalincrementmeasuredincrement.Inpracticethesenssensitivityisusuallyknownbymeasuringtheoutputsignaltheinputquantityisdeterminedfromi

7、nput=outputsignalincrementK1.3acteristicsofanIdealSensThehighsensshouldexhibitthefollowingacteristics.(a)highfidelitythesensoutputwavefmshapebeafaithfulreproductionofthemeasuredthereshouldbeminimumdisttion.(b)Thereshould

8、beminimuminterferencewiththequantitybeingmeasuredthepresenceofthesensshouldnotalterthemeasuredinanyway.(c)Size.Thesensmustbecapableofbeingplacedexactlywhereitisneeded.3CapacitiveSensThecapacitancecanthusmadetovarybychang

9、ingeithertherelativepermittivitytheeffectiveareathedistanceseparatingtheplates.Theacteristiccurvesindicatethatvariationsofarearelativepermittivitygivealinearrelationshiponlyoverasmallrangeofspacings.Thusthesensitivityish

10、ighfsmallvaluesofd.Unlikethepotentionmeterthevariabledistancecapacitivesenshasaninfiniteresolutionmakingitmostsuitablefmeasuringsmallincrementsofdisplacementquantitieswhichmaybechangedtoproduceadisplacement.4InductiveSen

11、sTheinductancecanthusbemadetovarybychangingthereluctanceoftheinductivecircuit.Measuringtechniquesusedwithcapacitiveinductivesens:(a)A.C.excitedbridgesusingdifferentialcapacitsinducts.(b)A.C.potentiometercircuitsfdynamicm

12、easurements.(c)D.C.circuitstogiveavoltageproptionaltovelocityfacapacit.(d)FrequencymodulationmethodswherethechangeofCLvariesthefrequencyofanoscillationcircuit.Imptantfeaturesofcapacitiveinductivesensareasfollows:(i)resol

13、utioninfinite(ii)accuracy0.1%offullscaleisquoted(iii)displacementranges25106mto103m(iv)risetimelessthan50uspossibleTypicalmeasursaredisplacementpressurevibrationsoundliquidlevel.5LinearVariabledifferentialTtransfmer6Piez

14、oelectricSens7ElectromagicSens8ThermoelectricSens9PhotoelectricCells10MechanicalSensSensingElementsIninfmationagetheinfmationindustryincludesinfmationgatheringtransmissionprocessthreepartsnamelysenstechnologycommunicatio

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