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1、电阻应变式称重传感器（Resistancestraintypeweighingsensor）Resistancestraintypeweighingsensor1.resistancestraintypeweighingsensorandsoon2.weighingsensorscommonlyusedtechnicalparameters3.generalrulesforselectionofweighingsensors4.useweighingsensorprecautions1.resistancestraintypeweighingsensorandsoon,Resistancest
2、rainweighingsensorissuchaprinciple:Basedontheelasticbody(elasticelement,sensitivebeam)produceelasticdeformationundertheactionofexternalforce,theresistancestrainchippastedonthesurface(conversionelement)healsoaccompaniedthedeformation,straindeformation,itsresistancevaluewillchange(increaseordecrease),
3、followedbythecorrespondingmeasuringcircuittoconverttheresistancechangeintoelectricalsignals(voltageorcurrent),thuscompletingthetransformationprocessforexternalsignal.Thus,theresistancestraingauge,elasticbodyanddetectioncircuitareindispensablepartsoftheresistancestraintypeweighingtransducer.Thefollow
4、ingthreeaspectsarebrieflydiscussed.Resistancestraingauges!Aresistancestrainsheetisamechanicalpiecethatisdistributedoverabaseoforganicmaterialthatbecomesastraingauge.Oneofhisimportantparametersisthesensitivitycoefficient,K.Let'sintroduceitsmeaning.Thereisametalresistancewire,itslengthisL,thecrosssect
5、ioniscircularradiusofR,itsareaisdenotedasS,theresistivityrecordedasP,thePoissonratioofthematerialis.Whentheresistancewireisnotsubjectedtoexternalforce,ithasaresistancevalueofR:RL/S(omega)=PWhenhisendsaresubjectedtoFforce,theywillelongate,thatistosay,todeform.IfitselongationisL,itscrosssectionalareai
6、sreduced,thatis,theradiusofitscrosssectionisreducedbyR.Inaddition,alsoavailableexperimentsshowthatthemetalresistancewireafterthedeformation,theresistivitywillalsochange,denotedasdeltaP.Thetype(2--1)fordifferentialresistancewirethatiscalculatedafterelongation,hisresistancevaluechangedmuch.Wehave:$Z9V
7、*W)L3sJ7J_)!R=L/S+deltaPDeltaLDeltaSP/S-PL/S2(2-2)Theuseof(2--1)removal(2--2)toobtain,DeltaR/R=deltaRho/Rho+L/L-S/S(2-3)5Inaddition,weknowthatthecrosssectionalareaofthewireisS=PiR2,thendeltaS=2,PIr*,d
