高精度照度计的设计(3)
时间:2025-02-22
时间:2025-02-22
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
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