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1、附录ATransducerandsensorexcitationandmeasurementtechniquesManyoftoday'sindustrialandinstrumentationapplicationsinvolvingsensor.Thefunctionofthesensorsystemistomonitorchanges,andthenthisdatabacktothemaincontroller.Forasimplevoltageorcurrentmeasurementsensorsma
2、yberesistanceinnature.However,somesensorsystemmaybeinductiveorcapacitiveinnature,thatistosay,thefrequencyrangeofthesensorresistancechangeisnonlinear.Impedancesensorssuchtypicalexampleistheproximitysensor-acampaignforthedetectionoftherelativedistanceofobject
3、s;Inaddition,capacitivesensorsorsensorsensibility-inthemedicaldevicesusedtomeasurebloodfloworbloodpressureorbloodqualitativeanalysis.Inordertousethese"compleximpedancesensors,"therealizationofmeasurement,toprovideanexchangeof(AC)excitationsourcefrequencyint
4、hefrequencyrangeofthesensorforscanning.Thisarticleattemptstoexplainhowtheuseofsingle-chipdigitalwaveformgeneratortoeasilyachievethisupto10MHzfrequencyscanning.Alsointroducedakindofintegratedincentive,responseanddigitalsignalprocessor(DSP)featuresacompletesi
5、ngle-chipsensorsolutionthatsuitedtherequirementsofuptonearly50kHzfrequencyapplications.Sensors:workingprinciple.InspiredbythefrequencyofsensorsignalsbasedonsensorvaluesofLorCtoshowthecorrespondinginstantaneousmagnitude,frequencyorphasechanges.Forexample,the
6、ultrasoundwillshowaflowofphaseoffset,whiletheproximitysensorwillcausetheratetochange.Trackingchangesinimpedancethatisthemostcommonlyusedtomonitortheresonantfrequencycircuit.Capacitancevalueoftheresonantfrequencyisequaltothefrequencywheretheinductancevaluepo
7、int.Thisisalsothelargestfrequencycurvefrequencyimpedancevalueofthecorrespondingpoint.Undernormalcircumstances,forexample,instaticconditions,thesensorL,RandChasauniquevalue,intheresonantfrequencyimpedancetoDepartmentwiththegreatestvalue.Whenamovingobjectnear
8、thesensor,thensensorLandCvalueswillbechangedandanewresonantfrequency.Bymonitoringthechangesinresonantfrequency(andthusleadtochangesinimpedance),itispossibletospeculatethattherelativemovementofobjectsmo
