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1、附录ATransducerandsensorexcitationandmeasurementtechniquesManyoftoday'sindustrialandinstrumentationapplicationsinvolvingsensor.Thefunctionofthesensorsystemistomonitorchanges,andthenthisdatabacktothemaincontroller.Forasimplevoltageorcurrentmeasurementsensorsmayberesistanceinnat
2、ure.However,somesensorsystemmaybeinductiveorcapacitiveinnature,thatistosay,thefrequencyrangeofthesensorresistancechangeisnonlinear.Impedancesensorssuchtypicalexampleistheproximitysensor-acampaignforthedetectionoftherelativedistanceofobjects;Inaddition,capacitivesensorsorsens
3、orsensibility-inthemedicaldevicesusedtomeasurebloodfloworbloodpressureorbloodqualitativeanalysis.Inordertousethese"compleximpedancesensors,"therealizationofmeasurement,toprovideanexchangeof(AC)excitationsourcefrequencyinthefrequencyrangeofthesensorforscanning.Thisarticleatte
4、mptstoexplainhowtheuseofsingle-chipdigitalwaveformgeneratortoeasilyachievethisupto10MHzfrequencyscanning.Alsointroducedakindofintegratedincentive,responseanddigitalsignalprocessor(DSP)featuresacompletesingle-chipsensorsolutionthatsuitedtherequirementsofuptonearly50kHzfrequen
5、cyapplications.Sensors:workingprinciple.InspiredbythefrequencyofsensorsignalsbasedonsensorvaluesofLorCtoshowthecorrespondinginstantaneousmagnitude,frequencyorphasechanges.Forexample,theultrasoundwillshowaflowofphaseoffset,whiletheproximitysensorwillcausetheratetochange.Track
6、ingchangesinimpedancethatisthemostcommonlyusedtomonitortheresonantfrequencycircuit.Capacitancevalueoftheresonantfrequencyisequaltothefrequencywheretheinductancevaluepoint.Thisisalsothelargestfrequencycurvefrequencyimpedancevalueofthecorrespondingpoint.Undernormalcircumstance
7、s,forexample,instaticconditions,thesensorL,RandChasauniquevalue,intheresonantfrequencyimpedancetoDepartmentwiththegreatestvalue.Whenamovingobjectnearthesensor,thensensorLandCvalueswillbechangedandanewresonantfrequency.Bymonitoringthechangesinresonantfrequency(andthusleadtoch
8、angesinimpedance),itispossibletospeculatethattherelativemovementofobjectsmo
