大位移电涡流传感器测量电路的设计

200912仪表技术与传感器InstrumentTechniqueandSensor2009No12:2008-09-05:2009-06-11高松巍,刘云鹏,杨理践(,110178):电涡流传感器由于具有对介质不敏感非接触的特点,广泛应用于对金属的位移检测中为扩大电涡流传感器的测量范围,采用恒频调幅式测量电路,引用指数运算电路作为非线性补偿环节利用Matlab计算软件辅助设计了直径为60mm电涡流传感器探头,并结合测量电路进行实验实验结果表明最大测量范围接近90mm,验证了该系统工作的稳定性,证明设计达到了预期效果:电涡流传感器;测量电路;大位移;线性化:TM934H76:A:1002-1841(2009)12-0088-03DesignofTestingCircuitforLargedistanceEddyCurrentSensorGAOSongwe,iLIUYunpeng,YANGLijian(SchoolofInformationScienceandEngineering,ShenyangUniversityofTechnology,Shenyang110178,China)Abstract:Forthecharacteristicsofbeingnosensitivetothemediaanduncontaction,eddycurrentsensoriswidelyusedformetaldetectioninthedistanceToexpandthescopeofdetecting,thetestingcircuitwasdesignedtobetheconstantfrequencycarrierAMtestingcircuit,andapplicatedforexponentialcomputingcircuitasnonlinearitycompensationUsingcalculationalsoftwareMatlab,theeddycurrentsensorprobewasdesigneddia60mmandputintoexperimentwiththetestingcircuitExperimentalresultsshowthatthelargestscopeofdetectingiscloseto900mm,anditisvalidatedbyexperimentthatthesensorworkssteadilyandreachestheexpectanteffectKeywords:electriceddycurrentsensor;testingcircuit;largedistance;linearization0,[1],,1/3~1/5,,1/2,[2],1:,,1,,,,,ZZfx,x,,ZxZ(x),Zx,x221[3]2,,,,,2,521,Matlab:60mm,57mm,3mm,80,025mm.22,12:892,1%,10%DDS(DirectDigitalSynthesis)AD9850,AD9850,125MHz,0029Hz.23,,,,,,LCOP37,1M24,3,,RW10,325x50mm,,,,42,(1),[4],(),(),2AD704,5,,A3xV2,A4A55VVref1Vref2Vref3MAX6250;D3,V30,6,A6A7Q1Q2,A8A9(Howland),:IrefVref3/R20(1)V4=IC2R16=IseVBF2UTR16=IseVBE1UTe-R14R14+R13V3UTR16=Irefe-[R14/(R14+R13)][V3/UT]R16(2)6,,,V45A3xV2Vout3,2cm,(200200)mm2,,x,90InstrumentTechniqueandSensorDec2009Vout1Vout2,Vob1Vob2(VoutVomax),12-71x/mmVob1Vob2x/mmVob1Vob200000570056600007720565100001120091700008160705200002220136800008420782300004360195900008450822400005720282100000846083250000710044511000084708384:,,1/21,:[1],..,1999(2):38-40.7-[2]DITCHBURNRJ,BURKESK,POSADAM.Eddycurrentnondestructiveinspectionwiththinspiralcoilslongcracksinstee.l.JournalofNondestructiveEvaluation,2003,22(2):63-77.[3],,..,2005(1):508-510.[4],..,1998(6):27-30.:(1956),,Emai:[e-mail](上接第84页)OSTimeDly()2,405=2ms1,2ms1pH4,ARMS3C44B0X,,(c)补碱7,,,C/OS-,,,:,:[1]..:,2002.[2].ARM.:,2002.[3]..:,1995.[4],..,2004(2):17-20.[5],.PID.,2008(3):43-46.[6],,.RBFPID.,2006(1):270-273.:(1977),,:;Emai:[e-mail]