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1、PhotoelectricDetectionSystemDesignningofWeakOpticalSignalSunLifei,WangZenglin(JilinUniversityofElectronicScienceandEngineeringInstitute)Abstract:detailedanalysisofthephotoelectricdetectionsystemcomponents,expoundedAD7714chipinthephotoelectricdetectionsystem,theapplicationconverterFinallytheAD77
2、14andAT89C52interfacecircuit,flowchartandkeysubroutine.Keyword:AD7714;89C52;PhotoelectricdetectionsystemForeword:photoelectricdetectiontechnologyhasbeenwidelyusedinmilitary,industrial,agricultural,andtheuniverse,environmentalscience,healthandothercivilianareas.Theuseofmoderntechnologyasphotoele
3、ctrondetectionmeanswithnocontact,non-destructive,long-range,anti-interferencecapability.Lessaffectedbyenvironment,testingspeed,highprecisionmeasurementadvantagesofthepresentdetectiontechnologyisthemajortrend.AmericancompaniesADDAD7714chipisachargebalanceAnalogtoDigital.ConverterItuses-samplingc
4、onversiontechnologytoachievethe24non-erroranalogsignalmodulation.Ithashighconversionaccuracy,excellentstaticpropertiesandtheintegrityofthefrontandsimulationchipcorrection,particularlysuitableforthemeasurementoflow-frequencysmall-signal.ThispapersuccessfullyappliedtoAD7714photoelectricdetections
5、ystem,andhasmadegooduseofeffects.Thispaperintroducesthephotoelectricdetectionsystemthroughouttheframestructure,thenanalyzesthePINphotodiodephotoelectricdetectioncircuitandAD7714andmicrocontrollerinterfacecircuit,Finallyprocessdiagram.1AphotoelectricdetectionsystemblockdiagramPhotoelectricdetect
6、ionsystemblockdiagramshowninFigure1,theopticalsignalthroughoptical-electricalsignalconversioncircuitvoltagesignaltochange,AnalogtoDigitalConvertersthisvoltagesignalcorrespondingtothedigitalinputofthemicrocontroller.SCMdigitalsignalprocessingandtheresultwillbedisplayed.Tophotoelectricsignalconve
7、rtercircuitoutputvoltagesignalintheanalog-to-digitalconverterinputvoltagerange,WeuseSCMtoswitchfeedbackresistor,therebychangingtheopticalsignalcorrespondingtotheoutputvoltage.TheresultsfromtheopticalsignalLCDdisplay.Pic1Photoelect
