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1、附录ATransducerandsensorexcitationandmeasurementtechniquesManyoftoday'sindustrialandinstrumentationapplicationsinvolvingsensor.Thefunctionofthesensorsystemistomonitorchanges,andthenthisdatabacktothemaincontroller.Forasimplevoltageorcurrentmeasurementsensorsmay
2、beresistanceinnature.However,somesensorsystemmaybeinductiveorcapacitiveinnature,thatistosay,thefrequencyrangeofthesensorresistancechangeisnonlinear.Impedancesensorssuchtypicalexampleistheproximitysensor-acampaignforthedetectionoftherelativedistanceofobjects;
3、Inaddition,capacitivesensorsorsensorsensibility-inthemedicaldevicesusedtomeasurebloodfloworbloodpressureorbloodqualitativeanalysis.Inordertousethese"compleximpedancesensors,"therealizationofmeasurement,toprovideanexchangeof(AC)excitationsourcefrequencyinthef
4、requencyrangeofthesensorforscanning.Thisarticleattemptstoexplainhowtheuseofsingle-chipdigitalwaveformgeneratortoeasilyachievethisupto10MHzfrequencyscanning.Alsointroducedakindofintegratedincentive,responseanddigitalsignalprocessor(DSP)featuresacompletesingle
5、-chipsensorsolutionthatsuitedtherequirementsofuptonearly50kHzfrequencyapplications.Sensors:workingprinciple.InspiredbythefrequencyofsensorsignalsbasedonsensorvaluesofLorCtoshowthecorrespondinginstantaneousmagnitude,frequencyorphasechanges.Forexample,theultra
6、soundwillshowaflowofphaseoffset,whiletheproximitysensorwillcausetheratetochange.Trackingchangesinimpedancethatisthemostcommonlyusedtomonitortheresonantfrequencycircuit.Capacitancevalueoftheresonantfrequencyisequaltothefrequencywheretheinductancevaluepoint.Th
7、isisalsothelargestfrequencycurvefrequencyimpedancevalueofthecorrespondingpoint.Undernormalcircumstances,forexample,instaticconditions,thesensorL,RandChasauniquevalue,intheresonantfrequencyimpedancetoDepartmentwiththegreatestvalue.Whenamovingobjectnearthesens
8、or,thensensorLandCvalueswillbechangedandanewresonantfrequency.Bymonitoringthechangesinresonantfrequency(andthusleadtochangesinimpedance),itispossibletospeculatethattherelativemovementofobjectsmo