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高精度照度计的设计(3)

发布时间:2021-06-08   来源:未知    
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大连理工大学硕士学位论文

DesignofHigh accuracyLuminometer

Abstract

Inthe=chitccture,health,filmandtelcvisionindustries,luminancemeasurementsare

verycommon,allofthesedemandmeasurementofhighprecision.Consequently,thispaper

designsalow-costdigitalluminometerwithhigh-precision

asandautomaticconversionrange.ThesystemregardsAT89C51thekeypartofthemeasurememsystem,whichincludes

signalgather,signalamplification,A/Dconversion,nquidcrystaldisplay,keyboard

RS 232andcommunicationinterfaceparts.

asInthispaper,siliconphotocellischosen

withaluminometcrphotoelectricconversionprobetime,photoelectric

aswidespectralrangeresponse,shortlargearearesponseconversionwithhighefficiency,andofPNjunctionofsiliconsolarcellsluminometerphotoelectric

v(^)filterandconversionprobe

cosineand.itcreatesaseparateopticalprobe,andintroducedaamendmenttoseparateiffTomthefuselage,itcanbebetteradaptedtothecosinelaw

andimprovethemeasurementprecisionand

(1)Thedesignofphotoelectric

accuracyscope.Next,thefollowingpointsareemphasized:conversionpreamplifiercircuit.Inordertoimprovetheandmeasurementofluminometerensurelinearrelationshipofthephotoelectric,

oneoperationalamplifiersisdesignedascurrent-voltageconverterform.on

canthehand,itisaavailabletozero-loadeffect;ontheotherhand,short-circuitcurrent

voltagevolume

abetransformedintothroughonthefeedbackresistor,itisequivalenttovoltagedropflowedthroughloadresistortheactualeffect.(2)Designofautomaticconversionrangecircuit.As

visiblelightirradiationofsiliconsolarcellsatthephotocurrentistoowidc.inorderto

guaranteetheaccuracyofA/Dconversion.The4602AnalogSwitches,whichproducedby

MAXIMcompanieswithsmall

differentchannelresistance,ischosentorealizeswitchingbetweentherange,switchingofrangeiscontrolledbymicrocomputer.0)Designofdisplay

circuit.TCl602ALCDmoduleisusedinthispaper,whileLCDilluminationdoesnotaffect

themeasurementandLEDc蛆Luminescentbyitselfthathadagreatinfluenceonthe

luminancemeasurements.(4)Choiceofscalingtransformation.Thesoftwareis

controlandovercomesomeshortcomings.whichincludethehighcostof

controlling,PCBarea

paperoccupied,signaldesigntohardwareseal锄ansformedisnotveryaccurate,resistancevaluedriftingbecauseoftemperature,humidity,andotherenvironmentalchanges.Finally,thepresentsanti-jammingspecificmethodsandmeasuresoftheimpactofilluminometerperformance.

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