华科机械研究生课程数字信号处理实验报告.docx
- 文档编号:17603224
- 上传时间:2023-07-27
- 格式:DOCX
- 页数:21
- 大小:1MB
华科机械研究生课程数字信号处理实验报告.docx
《华科机械研究生课程数字信号处理实验报告.docx》由会员分享,可在线阅读,更多相关《华科机械研究生课程数字信号处理实验报告.docx(21页珍藏版)》请在冰点文库上搜索。
华科机械研究生课程数字信号处理实验报告
DigitalSignalProcessing
ExperimentReport
Name:
StudentID:
Department:
MechanicalElectronicEngineering
Date:
2013-12-13
Experiment1ThePropertyofPhoto-resistor
1.Purpose
UnderstandtheprincipleandapplicationofPhoto-resistorinlightmeasurement,andlearnthemeasurementcircuit.
2.Principle
ThePhoto-resistoristhecircuitelementwhoseresistancechangeswiththelightintensity.Withcertaincircuit,wecangettheresistanceandwithwhichwecangetthelightintensity,becauseoftherelationbetweentheresistanceandthelightintensityisstationary.
3.Materials
1.Experimentcircuitboard
2.Photo-resistor
3.Resistance(2K).
4.
Lightsource.
5.Computer.
6.Wire.
4.Experimentstep
1.Buildthecircuitasfig2,thephoto-resistorhasnopolarity.
2.
Fig2theexperimentcircuit
Calibratetheprogram,andmaketheoutputoftheprogramis5whentheVout=5V,and-5whentheVout=-5V.
3.Fixthelightsource,andmeasurethelightintensitywiththecomputerandsavethedata.
4.Changethelightintensityanddostep3inthreedifferentlightintensity.
5.Analyzeandshowthedata.
5.Result
Figure3theresultdataofthisexperiment
Therearethreesortsoflightintensityintheexperiment.Thegreenoneisatthelightofaflashlight,andtheblueoneisthecommonlight,andtheredoneisintheconditionthatwecoveredthephoto-resistor.Fromthefigurewecanfindthattheoutputdatacanreflectthelightoftheenvironment.
6.Conclusion
Fromthisexperimentwecanfindthattheoutputdataoftheexperimentcanreflectthelightintensityoftheenvironment.AndwiththehelpoftheIlluminometer,wecangettherelationbetweentheoutputandthelightintensity,andthen,wecancalculatethelightintensityfromtheoutputdata.
Fromthisexperiment,Ihavelearnttheprincipleandtheapplicationofthephoto-resistor.
Experiment2Temperaturemeasurement
7.Purpose
LearnthetemperaturecharacteristicandtheapplicationoftheK-Thermocouple.
UnderstandtheworkprincipleofAD590thermalsensorandlearnthemeasurecircuit.
8.Principles
ThepotentialdifferencetableofK-Thermocoupleisasblow:
Table1K-thermocouplethermoelectricpowermeter:
Temp(℃)
-100
0
+100
+200
+300
+400
+500
+600
Poten(mV)
+3.553
0
+4.095
+8.137
+12.207
+16.395
+20.640
+24.902
Therelationcanbedescribedas:
V0=-0.776+24.9952Vin-0.037332Vin2(mV)(2—1)
Fromthetablewecanfindwhenat0°C,thepotentialdifferenceis24.902mV.Tomaketherangeof0-600mVmoreclearly,theAmplificationfactoroperationalamplifiershouldbeset240.94,andthentheoutputofoperationalAmplifierisintherangeof0-6000mVwhichstandsforthepotentialdifferenceof0-600°C.
TheoutputelectriccurrentofAD590isproportionaltotheabsolutetemperature,itjustlikeaconstantcurrentsourcewithhighimpedance.Therelationbetweenthecurrentandtemperatureis1uA/K.Linearcircuit,precisionvoltageamplifier,resistancemeasurementcircuitandcoldjunctioncompensationisnotneededinAD590applicationintemperaturemeasurement.
9.Equipment
TheK-Thermocoupletemperaturemeasurement
1.Breadboard.
2.K-typethermocouple.
3.OperationalAmplifierOP07.
4.Resistance(1.3K,300K).
5.Adjustableresistance(33K)
6.Somejumper.
7.Computer.
TheIntegratedtemperaturesensortemperaturemeasurement
1.Breadboard.
2.IntegratedtemperaturesensorAD590.
3.Resistance(1K)
4.Capacitors(104uF)
5.Jumpers,Multi-meter(owned)
10.Methods
TheK-Thermocoupletemperaturemeasurement
1.Buildtheelectriccircuitaccordingtotheschematicdiagraminfig2-1.Whenbuildtheelectriccircuit,fig2-2canbereferred.
Fig2-1theschematicdiagram
Fig2-2anexampleelectriccircuit
2.Movethethermocoupleneartotheheatsource,andregulatethepotentiometerW1,andmaketheoutputvoltage10mV/°C.Regulatethetemperatureoftheheatsourceandthepotentiometertomaketheelectriccircuitmeetourneeds.
3.Thereisnocoldjunctioncompensationintheelectriccircuit,sotheroomtemperatureshouldbeadded.Andfilledthetablewiththedatagetfromtheexperiment.
4.Drawthetemperaturecharacteristiccurve.
TheIntegratedtemperaturesensortemperaturemeasurement
1.Buildtheelectriccircuitaccordingtheschematicdiagraminfig2-3,andexaminethecircuitcarefully.
Fig2-3themeasurementelectriccircuitschematicdiagram
2.MovetheAD590neartotheheatsource,andrecordtheoutputvoltage.
3.Regulatethetemperatureoftheheatsource,anddostep2again,andfillthetable.
4.Drawthetemperaturecharacteristiccurve.
11.Result
TheK-Thermocoupletemperaturemeasurement
Becausetherearesomeproblemwiththeexperimentequipment,nomatterhowweregulatethepotentiometerw1,wecannotsettheoperationalamplifier240.95evenweaskedtheteacherforhelp.Underthiscondition,wejustmeasureourhandandtheroomtemperature.Thisisthedatawegetfromtheequipment.
Fig2-4theK-thermocoupletemperaturemeasurement
Thosedataismeasuredintheconditionthatwedon’tknowtheoperationalamplifier,butwecanapproximatelycalculatetheoperationalamplifier.Theroomtemperatureassumedtobe20°C,andthehandtemperatureassumedtobe35°C,theoperationalamplifierisabout6.84.
Integratedtemperaturesensor:
Thefromtheworkprincipleofintegratedtemperaturesensor,weknowthattheoutputofthecircuitisthetemperatureinKelvin,tochangeintoCelsius,theformulais:
T=U–273.2
Thedatagetfromtheexperimentisshowinfig2-5.Theblue(upper)isthemeasuredundertheHotHair,andthered(lower)ismeasuredtheroomtemperature.
Fig2-5theIntegratedtemperaturesensormeasurement
Fromtheformula,wecancalculatethetemperatureoftheroomis
andthetemperatureoftheheatair
Theroomtemperatureisalittlehigherthantheactual,wesupposethat’sbecausewemeasurethehotairfirst,andthenmeasuretheroomtemperature,andwhenwemeasuretheroomtemperature,thesensorisnotcolddown.Besidesthat,thecircuitheatisanotherreason.
12.Conclusion
Fromthisexperiment,wehavelearntthetemperaturemeasurement.Butbecauseoftheproblemsoftheequipment,theK-thermocouplemeasurementisnotgoodenough.ButtheIntegratedtemperaturesensorisverygood,linearcircuit,precisionvoltageamplifier,resistancemeasurementcircuitandcoldjunctioncompensationisnotneededinAD590applicationintemperaturemeasurement.
Experiment3Themeasurementoftheenvironmentalnoisebynoisesensor
13.Purpose
Learntheprincipleandapplicationofnoisesensor.
14.Principle
Someplasticcanbepermanentlychargedaftersomespecialprocess,andtheycangeneratetherequiredelectricfieldandvoltageamplifier,whichcalledelectret,andtheyusuallymadeintodiaphragm.Whenthesoundpushthediaphragm,thedistancebetweenthediaphragmandthebaseischanged,whichgeneratepotentialdifferencewhichcanbemeasuredeasily.
3.Materials
1.Experimentcircuitboard
2.ElectretDB37
3.Resistance(10K,1K)
4.Adjustableresistance(100K)
5.PPOcapacitors(104uF)
6.Operationalamplifier(OP07)
7.Jumpers,Multi-meter(owned),luminancemeter(owned)
15.Method
1.Buildtheelectriccircuitbasedontheschematicdiagraminfig3-1,andcheckitcarefully,thereisanexampleinfig3-2.
2.Showtheoutputwaveformwithcomputer.
Fig3-1themeasurecircuitschematicdiagram
Fig3-2Anexampleofthecircuit
16.Result
Inthisexperiment,wemeasuredtwosignalsourceintheconditionthatthesampleFrequencyis5000Hzand9000Hz.Theoutputdataisshowinfig3-3andfig3-4.
Fig3-3Thewaveformofmusic(Fs=5000)
Thedatainfig3-3ismeasuredthemusicplayedbyatelephone,andthesamplefrequencyis5000.WhenplayitoutwithMatlab,wefindthatit’snotthesameasthesoundplayedbythetelephone,andit’sseriousdistortbecauseofthelowsamplefrequency.Besidesthat,thesoundplayedfromthetelephoneisalittlebitsharp,whichleadthattheelementofhighfrequencyisbig.
Totestisitasweanalyzebefore,wemeasuredanotherone.Inthisexperiment,wesetthesamplefrequencyas9000Hz,andthesoundsourceismanspeaking.Thewaveformisshownisfig3-4.Fromthewaveformwecanfindit’smoresimilartothewaveformwemeasurefromsoundcardwithMatlabincomputer.Whenplayitout,thedistortionislessthantheformalone.
Fig3-4thewaveformofmanspeaking(Fs=9000)
17.Conclusion
Fromthisexperiment,welearnedtheapplicationofnoisesensorandmeasuredthesoundplayedwithtelephoneandmanspeakingindifferentsamplefrequency.Becauseofbandwidthlimitofthecapturecard,evenwesetthesamplefrequencytothehighest,thereisstilldistortion.Butforthenoisemeasurement,theequipmentisenough.
Experiment4:
ThemeasurementofBridgeperformance
18.Purpose
Understandtheeffectofmetalfoilstraingage,andunderstandtheapplicationofWheatstonebridge,halfbridgeandfullbridge,andcomparethethreemethodsofmeasurement.
19.Principle
1)TheprincipleofDCBridge
Thebalancecondition
ThebasicformoftheDCBridgeisshowinfig4-1,whentheDCBridgebalanced,V0=0,thatis
Fig4-1BasicformoftheDCBridge
Theequilibrium
i.Wheatstonebridge
TheWheatstonebridgeisoneofthefourresistanceisasensor,andweassumeitsresistancechanges△R,andothersnotchanged.Atthiscondition,theoutputvoltageV0:
or
Because△R1< Therelativeerrorris Wheren= .Thesensitivityofthesystemis = Ifn=1, willbemax.ThatistosayifR1=R2,R3=R4,alltheformulaa
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 机械 研究生课程 数字信号 处理 实验 报告