电阻应变片的实验与应用

30420114实验室研究与探索RESEARCHANDEXPLORATIONINLABORATORYVo.l30No.4Apr.2011李巧真,李刚,韩钦泽(,300072):电阻应变片是广泛应用的传感元件之一,已成为非电量电测技术中重要的检测手段介绍了其工作原理及测量电路的设计与特性,并通过两个实例说明了电阻应变片的应用:电阻应变片;传感器;测量电路;直流电桥;交流电桥:TP212.1:A:1006-7167(2011)04-0134-05ExpermientandApplicationofResistanceStrainGaugeLIQiaozhen,LIGang,HANQinze(SchoolofAutomation,TianjinUniversity,Tianjin300072,China)Abstract:Resistancestraingaugeisoneofwidelyusedsensors,hencehasbecametheimportantmeaninnonelectricitymeasuremen.tThispaperintroduceditsoperationprinciple,andcharacteristicsofmeasuringcircuits.Twoexampleswerepresentedtoexplaintheapplicationofresistancestraingauge.Keywords:resistancestraingauge;sensors;measuringcircui;tDCbridge;ACbridge:2010-09-03:(1960-),,,,Te.l:02227404274;02281998228;Emai:[e-mail]0[1],11.1[2]L,A,(1),:R=LA(1):R();(m);L(m);A(m2),A=r2,rF(),LA:dRR=(1+2+E)(1):;;E;(1),2:,(l+2);,,E,(l+2+E),,,(1),K0=(1+2+E),dRR=K0(2):K0,(),,1.2()1(1)敏感栅-1李巧真,等:电阻应变片的实验与应用1(2)基底,;,,,0.02~0.04mm(3)引线(4)覆盖层(5)黏结剂,,[3]22.122CY10,,,[4],,,[5]2.22.2.134,1:UE;UL;RL,UL=R1R1+R2UE-R3R3+R4UE=UER1R4-R2R4(R1+R2)(R3+R4)(8),R1R4=R2R3,,UL=03(1)直流单臂电桥输出电压灵敏度R1,,R2R3R4R1,R1=R1+R1,,ULUE4RR=UE4K(4)(2)2,半桥测量,2,1,1,UL=UE2RR(5),,1(3)4,,全桥测量UL=UE4K(1-2-3+4)(6)4,2.2.2[7]4,R1R2R3,Rx=R4,,,,1X=0.5mm4135实验室研究与探索30[89],,5(a)X,U5U-X,R3R4,2,,5(b),R1R222,,,,,5(c):S(=U/X)2750103mV/mm,2.32.3.1Z1Z2=Z3Z4,Z1Z2Z3Z4,:,,[10]2.3.2(1)测量系统调零6,,R1R2R3R4;W1W2Cr,0,0.4~10kHz,,,F/V20V,X0.1~0.5ms,YCH1CH25V/div,5kHz,W1W2,F/V,F/VY2V50mV/div,W1W2,F/V,6,F/V(2)应变测量1,X=0.5mm,,U-X,7(f=35810kHzU-X(b)(c)(d))7U-X:f=35810kHzS(=U/X)1021149mV/mm,,f=5kHz,5kHz33.1,,F/V,,,F/V,6,,,F/V,,W1F/V,,F/V,U-W,88U-W1361李巧真,等:电阻应变片的实验与应用,S=U/W=(-26-0)/100=0.26mV/g3.2,,,,,,6,;UO,,,f(3~20Hz),Up-p,Up-p-f,99Up-p-f,Up-p,14Hz,,,Up-p,14Hz4,,,(References):[1].[M].:,2006:204205.[2],.[M].:,2002.[3].[M].:,1986.[4],,.[M].:,2007.[5].[M].:,2008.[6].[M].:,1988.[7].[M].:,2002.[8].[M].:,2008.[9],.VisuaiBasic[M].:,2003.[10].[J].,2005,22(2):6870.(10)AB=(AB)B2.2,222,,223,Otsu,,,,,,(References):[1],.[J].,2001,6(5):6975.[2],.[J].(),2004,21(1):7275.[3].[J].,2003,18:219220.[4],,.[J].,2003,11(6):467469.[5].[J].,2006,25(01):58.[6],,,.EM[J].,2009,26(2):2022.[7],,.[J].,2009,37(3):161163.[8],,.[J].(),2010,38(5):7274.[9].Matlab[J].:,2010.[10],,.[M].:,2009.[11].[M].:,2007.[12].[J].:,2010.137