华科数字信号处理实验课作业报告Word下载.docx
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华科数字信号处理实验课作业报告Word下载.docx
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Learnmetalfoilstraingaugestraineffectworksandperformance,comparingarm,half-bridge,fullbridgesensitivityandnon-linearityofoutputanddrawtheappropriateconclusions
II.Materials
1)Opensensortestbox
2)StrainSensor
3)Weights
4)Cables
5)Multimeter
III.Methods
1.AccordingtoFigure1,thewiringcolorsofresistanceonthesensorstraingaugesonR1,R2,R3andR4areyellow,white,red,blue.Useavailablemultimetertomeasurethetwoendsofthesamecolordiscrimination,R1=R2=R3=R4=350.
Figure1
2.AccordingtoFigure2andFigure3,accessresistor300
intoR24,R26,R27,thenconnectR1intoR25ontheboard.Ifthewiringiscorrect,powerit.UseamultimetertomeasurethevoltagebetweenIN0andIN1,adjustpotentiometerR28(100Rpotentiometer),makethevoltagedifferencebetweenIN0andIN1tozero.wecallthisstepthebridgezero.
Figure2
Figure3
3.Theinstrumentationamplifiercircuitoutputterminaltotheinvertinginputofscalingcircuit,measuredwithamultimeterinvertingoutputterminalofthevoltagescalingcircuit.Fromthethreeformerstageopampamplifier,sinceR30hasbeenfixed,theamplificationfactoroftheamplifierisdeterminedbytheR29(1Kpotentiometer)whenR29tendsto0,themaximumamplificationfactor.Thentheamplifieroutputvoltageisaboutsupplyvoltage(potentialdifferencedependsonthepolarityofthepolarityIN0andIN1'
s).Todeterminethespecificamplificationfactorandavoidsaturationoftheamplifieroutput,wherewecanadjusttothetopofthefirstR29anti-clockwise,theresistanceofabout1Kohms.Sopreamplifieritsamplificationfactorofabout201.AfterscalingcircuitlevelinvertingitsmagnificationbyR40(100Kpotentiometer)decidedthatinordertodeterminetheproportionoftheinvertingamplifierspecificamplificationfactorandavoidinvertingamplifierproportionofsaturatedoutput,thenwewilladjustR40counterclockwisecuttothetop.Itsresistanceisabout0inEurope,afterthelevelofmagnificationofapproximately1.Sinceweintroducethetwo-stageamplifier,whenadjusting,increasinguncertainty.Consequently,inadjustingthebeginning,wefirstpre-adjustedtothemaximumofthepotentiometer,thepotentiometertoadjustthesubsequentstagetoaminimum,fixedmagnificationlevels.
4.NotethatR24andR26shouldforcestatetheopposite,thattheforcesensorintwoopposite(atension,apressure)asaresistancestraingaugebridgeadjacentedges.Useamultimetertomeasuretheproportionofdirectlyinvertingamplifiercircuitoftheoutputvoltage.AdjustR42(10Kpotentiometer),theoutputvoltageiszero,whichwecallthezerooutput.
5.Wheatstonebridgeperformancetest.
100gweightisplacedonthearmtray,seechangesintheamountofvoltage.Ifthevoltagechangeamountisverysmall,thenthefirstclockwiseadjustmentpotentiometerR40,post-stageamplifiercircuittochangethegain(magnification).Ifyoucanchangetheamountofabout200mV.Notethat,whenchangingtheresistanceR40,R42oftheresistancetobeadjustedagain,inordertomeettheoutputoftheinvertingamplifiercircuitiszeroproportionalrequirements.IfyouadjusttheresistanceR40,theoutputvoltagevariationstillcannotmeettherequirements,theR40clockwisetoadjusttothetop,andthenadjustR29,theoutputvoltagetothevoltagechangeClaim.Notethat,whenchangingtheresistanceR29,R42oftheresistancetobeadjustedagain,inordertomeettheoutputoftheinvertingamplifiercircuitiszeroproportionalrequirements.AfteradjustmentR29,R40remainsunchanged,withtheexperimentaldatatofacilitatelatercomparison.
3.Half-bridgeperformancetest
Accordinginstrumentationamplifiercircuitdiagram(Figure1-2),theboardwillbeR25,R27access350Ωresistor,theredstrainsensor(orwhite)wirestraingaugesconnectedintothecircuitboardR24,thestraingaugeyellow(orblue)lineR26connectedtotheaccesscircuitboard,thenthestrainR25sheetR1,R3andthecircuitboard,R27connectedasadifferentialDCbridge(halfbridge).Aftercheckingthewiringiscorrect,power.UseamultimetertomeasurethevoltagebetweenIN0andIN1,adjustpotentiometerR28(100Rpotentiometer),thevoltagedifferencebetweentheIN0andIN1iszero.
TherestfollowastheaboveExperiment.Notethatifyouhavetoadjustthegainoftheexperimentagoodtune,R29,R40mustremainunchanged.
4.Full-bridgeperformancetest
Accordinginstrumentationamplifiercircuitdiagram(Figure1-2),thestraingagesensorsred,whitecableaccessboardR24,R27,thestraingaugeyellow,bluecableaccessR25board,R26,formafullbridgecircuit.Aftercheckingthewiringiscorrect,power.UseamultimetertomeasurethevoltagebetweenIN0andIN1,adjustpotentiometerR28(100Rpotentiometer),thevoltagedifferencebetweentheIN0andIN1iszero.
IV.Data
Weightisplacedonthetray,invertingthereadscalingcircuitoutputvoltage,increasetheweightandsuccessivelyreadthecorrespondingvoltagevalue.WritedowntheresultstofillinTable1to3,turnoffthepower.
Table1
mass(g)
100
200
500
Theoutputvoltage(V)
5.914
9.935
15.114
26.427
Table2
50
150
300
400
-7.794
-5.428
2.409
12.065
13.476
30.107
39.867
56.884
Table3
20.837
35.549
41.169
66.796
157.023
V.Results&
Discussion
1.AccordingtotheTable1to3,drawchanginggraphofvoltageandweight.
2.CalculatesensitivityS=ΔV/ΔM(ratiobetweenoutputvoltagevariationandtheamountofqualitychange).
Thethreefittingequationsisasfollow:
y=0.041x+6.131
y=0.130x-9.948
y=0.273x+17.868
Therefore,S1=0.041,S2=0.130,S3=0.273
Calculatethefittingerror:
error1=0.0052499,error2=0.01657,error3=0.34409
Theerrorisacceptedsinceissmall.
VI.Conclusion
Calculatetheexperimentalsensitivityandcompareexperimentalresults.
Fromthesensitivitywecanfindthatsensitivityofwheatstonebridgeisthesmallest,andFullBridgehasthebiggestsensitivity.So,theproperityofFullBridgeisthebest.
Experimentteo-PhotoelectricSensors
Understandtheprinciplesandapplicationsofphotosensitiveresistanceandtransmissiontypephotoelectricswitch
Opensensortestbox
Sensorbreadboard
DCComponents
Severalcable
Multimeter
Logger
Photoresistor
1.Connectthelightsourcecircuitaccordingtofigure1.AdjustthepotentiometerandobservethebrightnessoftheLED,andthencutoffthepower.
Figure1:
Lightsourcecircuit
2.BuildthecircuitonthesensortestboxasshowninFigure2.Checkthewiringcarefullytoensureitiscorrect.Thenturnonthepower.
Figure2:
Photoresistormeasurementcircuit
3.AdjustthepotentiometerlightcircuittochangetheLEDbrightness.Measureandrecordtheoutputvoltagevalue.
Photoelectricswitch
1.BuildthecircuitonthesensortestboxasshowninFigure3.Checkthewiringcarefullytoensureitiscorrect.
Figure3:
Photoelectricswitchmeasurementcircuit
2.Turnonthemotorswitchandthemotordrivesthesmallflywheel.Adjustthespeedknobtochangethemotorrotationspeed.
3.Collectandrecordtheoutputsignal.
1.Photoresistor
Figure4:
thewaveformoftheoutputwithdifferentlightness
Figure5:
thewaveformafterfiltering
2.Optoelectronicswitch
Figure6:
waveformofoptoelectronicswitch
Figure7:
waveformofoptoelectronicswitchafterfiltering
Discussion
Accordingtotheresultofphotoresistorexperiment,wecanfindthatthestrongerthelightis,thehighertheoutputvoltageis.
Weknowthatfs=5000,andthenumberofholesontheturntableis12.Accordingtotheresultofoptoelectronicswitchexperiment,wecancalculatethemotorspeedis79.36r/min.
VI.Conclusion
Throughthisexperimentweknowthecharacteristicsandapplicationofphotosensitiveresistance.Ourabilityandanalyticalskillsareexercised.It’sapitythatwelostthedataofresistanceintheexperimentofpholtresistor,sothatwedon’tgetthecurveofthephotosensitiveresistance’svoltagechangewithresistance.Thistoldusthatitisimportanttopreservethedatawhichwegetfromtheexperiment.
Experimentthree-K-typethermocoupleCharacteristicsandTemperatureMeasurement
Understandthetemperaturecharacteristicsandapplicationofthermocouple.
1.Breadboard;
2.K-typethermocouple;
3.OperationalamplifierOP07;
4.1.3KΩ,300KΩresistance;
5.33KΩadjustableresistance;
6.Severaljumpers;
7.Thermometer(bringyourown)andheat.
1.Buildthecircuitshowninthefigure2-1,carefullycheckthewiring,connectthethermocouple.
Figure2-1.ThermocoupleCircuit
2.Makethethermocoupleclosetotheheatsource,andadjustthepotentiometerW1,tomaketheamplifieroutputvoltagemeet10mV/℃.Adjusttheheattemperature,repeatedadjustingpotentiometertomeettherequirements.
3.UseMatlabtomeasurethevoltageVoutandsavethedata.
UseMatlabtoprocessthesaveddata,Igettheresultshowninfigure2-3,2-4,2-5.Theirlightintensityareenhancedonebyone.
Figure2-3.NormalAtmosphericTemperatureFigure2-4.Hand
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