外文翻译--- - 传感器和传感器激励和测量技术

附录ATransdu__r and sensor excitation and measurement techniquesMany of today's industrial and instrum

附录A Transdu__randsensorexcitationand measurementtechniques Manyoftoday'sindustrialandinstrumentationapplicationsinvolving sensor.Thefunctionofthesensorsystemistomonitorchanges,andthenthis databacktothe__incontroller.Fora______voltageorcurrentmeasurement sensors__yberesistan__innature.However,somesensorsystem__ybe inductiveorcapacitiveinnature,thatistosay,thefrequencyrangeofthe sensorresistan__changeisnonlinear.Impedan__sensorssuchtypicalexample istheproximitysensor-acampaignforthedetectionoftherelativedistan__ ofobjects;Inaddition,capacitivesensorsorsensorsensibility-inthemedical devi__susedtomeasurebloodfloworbloodpressureorbloodqualitative ____ysis.Inordertousethese"compleximpedan__sensors,"therealizationof measurement,toprovideanexchangeof(AC)excitationsour__frequencyin thefrequencyrangeofthesensorforscanning.Thisarticleattemptstoexplain howtheuseofsingle-chipdigitalwaveformgeneratortoeasilyachievethisup to10MHzfrequencyscanning.Alsointrodu__dakindofintegratedin__ntive, responseanddigitalsignalpro__ssor(DSP)featuresacompletesingle-chip sensorsolutionthatsuitedtherequirementsofuptonearly50kHzfrequency applications.Sensors:workingprinciple. InspiredbythefrequencyofsensorsignalsbasedonsensorvaluesofL orCtoshowthecorrespondinginstantaneous__gnitude,frequencyorphase changes.Forexample,theultrasoundwillshowaflowofphaseoffset,while theproximitysensorwillcausetheratetochange.Trackingchangesin impedan__thatisthemostcommonlyusedtomonitortheresonantfrequency circuit.Capacitan__valueoftheresonantfrequencyisequaltothefrequency wheretheinductan__valuepoint.Thisisalsothelargestfrequencycurve frequencyimpedan__valueofthecorrespondingpoint.Undernor__l circumstan__s,forexample,instaticconditions,thesensorL,RandChasa uniquevalue,intheresonantfrequencyimpedan__toDepartmentwiththe greatestvalue.Whenamovingobjectnearthesensor,thensensorLandC valueswillbechangedandanewresonantfrequency.Bymonitoringthe changesinresonantfrequency(andthusleadtochangesinimpedan__),itis possibletospeculatethattherelativemovementofobjectsmovingawayfrom thesensor. Calculatedresonantfrequency:calculationcircuitmeasuringtheresonant frequencyoftheneedfortherelationshipbetweenfrequencyandimpedan__, inparticular,needa__rtainfrequencyrangewiththeabilitytoscanthe waveformgenerator.A______,low-costmethodisbasedontheAD5930