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ID:6069023
大小:1.57 MB
页数:78页
时间:2018-01-01
《基于8051单片机的双电测四探针薄膜电阻率测量系统 毕业设计说明书》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要电阻率是电子材料的重要参考性能数,薄膜电阻率的测量备受关注。采用传统四探针高电阻率测量方法测量薄膜电阻率,需要加入较多的修正才能得到精确的结果。因此,研究薄膜电阻率的测量系统原理、软硬件集成方法等具有很重要的意义和应用价值。在综合比较各种电阻率测量方法的基础上,本设计采用双电测组合法测量薄膜电阻率。首先,系统研究双电测组合法薄膜电阻率测量原理,跟据测量要求改进电阻率的计算方法,极大的简化相关修正,提高测量结果的可靠性和精确度。其次,基于单片机的Rymaszewski四探针双电测组合法设计了薄膜
2、电阻率自动化测量系统。在8051单片机的控制下,利用基于CD4052芯片的接口电路实现电流探针,电压探针的自动切换,并通过单片机控制实现两次电压测量;同时根据两次测量结果编程完成范德堡修正因子的计算,最终实现薄膜电阻率自动测量和显示,建立基于8051单片机的双电测四探针薄膜电阻率测量系统。实验结果表明,所设计的自动测量系统不仅可以满足多种薄膜电阻率测量要求,而且提高了测量精度和自动化程度,同时精简了薄膜电阻率测量过程。关键词:四探针双电测组合法;范德堡修正因子;CD4052;薄膜电阻率77Abst
3、ractAttentionismainlypaidtothemeasurementofresistivity--animportantpropertyofthinfilm.Owingtoapplytraditionalfour-probemethodonfilmsampleresistivitymeasurement,complexcorrectionsarerequiredinordertoacquireanaccurateresultandsamplewilleasilybescratched
4、duringthemeasuringprocesswhenusingmanualfour-probeequipment.Therefore,themeasurementtheory,softwareandhardwareintegrationmethodbyvirtualinstrumentationforthinfilmresistivityautomaticsystemareofimportantvalue.Incomprehensivecomparativemeasurementmethod
5、ofresistivity,onthebasisofthedesignUSESdoubleelectricalmeasurementgrouplegalmeasuringfilmresistivity.First,systemresearchdoubleelectricalmeasurementisthelegitimatefilmresistivitymeasurementsoftheprinciplewithaccordingtomeasurementrequirements,thecalcu
6、lationmethodofimprovingresistivity,greatlysimplifiedrelatedcorrection,improvethereliabilityandprecisionmeasurementresult.Secondly,BasedonSCMRymaszewskifour-pointprobedoubleelectricalmeasurementgroupthefilmresistivitylegitimatedesignautomationmeasuring
7、system.In8051underthecontrolofthesinglechipmicrocomputerbasedonCD4052chipinterfacecircuitimplementscurrentprobe,voltageprobetoswitch,andthroughthesingle-chipmicrocomputercontrolachievetwovoltagemeasurement;Andaccordingtotwomeasurementresultsprogrammed
8、Vanderbiltcorrectionfactorcalculation,andfinallyachievethefilmresistivityofautomaticmeasurementanddisplay,basedonthesinglechipmicrocomputer8051doubleelectricalmeasurementoffourprobefilmresistivitymeasuringsystem.Theexperimentalresultshowsthatt
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