第1題x1,x2...xnarethemeasuredvalues,indicatewhichofthefollowingequationsrepresentstheresidual().Avi=xi-TruevalueBvi=xi-arithmeticmeanCvi=xi-indicationvalueDvi=xi-nominalvalue第2題Foralinearinstrument,itslinearityis().AlinearrelationshipwithoutputquantityBlinearrelationshipwithinputquantityCaconstantthatisnotequaltozeroDequaltozero第3題Thetemperatureofthetestedobjectisaround300℃.Thereareseveralspecificationsofthermometersavailableinthelaboratory,choosingoneofthemreasonablyfromtheperspectiveofimprovingmeasurementaccuracy.Arange800℃,accuracylevel1Brange400℃,accuracylevel1.5Crange600℃,accuracylevel1.5Drange500℃,accuracylevel2.5第4題Whichisthedynamiccharacteristicindexofsensors()?ArepeatabilityBlinearityCsensitivityDnaturalfrequency第5題Nonlineardegreereferstothedegreeofcalibrationcurve().AneartotruevalueBerrorfromfittingstraightlineCrouteofforwardandreversedirectionisnoncoincidenceDrepeatability第6題()referstothepartofthesensorthatcandirectlysensethebeingmeasured.AsensingcomponentBsensitivecomponentCmeasurementconversioncircuitDsensor第7題Arduinocanperceivetheenvironmentthroughvarioussensorsandgivefeedbackandimpactonenvironmentbycontrollinglights,motorsandotherdevices.ThemicrocontrollerontheboardcanprogrammebyusingArduinoprogramminglanguage,compileinto(),anddownloadintothemicrocontroller.AtxtfileBbinaryfileCJSscriptDhtmlWebpage第8題CH340isaUSBbustransferchipthatimplements()function.Thechipisintegratedonthedevelopmentboardmotherboard,thatistheUSBDebuginterface.BeforeusingtheUSBDebuginterface,itsdriverprogramneedstobeinstalledonthecomputer.AserialporttoUSBconversionBparallelporttoUSBconversionCUSBtoserialportconversionDUSBtoparallelportconversion第9題Thesmartcameraworks24hoursadayandgeneratesalargenumberofrecordedimagesthatneedtobestoredforeasyviewingbyusers.Thestoragemethodthatthesmartcamerascanadoptis().ASDcardlocalstorageBcloudstorageChybridstorageDalloftheabovearepossible第10題()referstotheratioofthesensoroutputincrement△ytothemeasuredincrement△xwhenthesensorisinsteady-stateoperation.ASensitivityBresolutionClinearityDhysteresis第11題Intheparametersofnaturalgasalarm,thesensorlifeusuallyreferstothe()ofthesensor.AServicelifeBbatterylifeCcalibrationcycleDmanufacturingtime第12題Automaticcontroltechnology,communicationtechnology,alongwithcomputertechnologyand(),constitutethecompleteinformationchainofinformationtechnology.AAutomotivemanufacturingtechnologyBbuildingtechnologyCsensingtechnologyDmonitoringtechnology第13題Sensorscanbedividedintothreecategoriesbasedonthesensitiveworkingprinciples:physical,chemical,and().AbiotypeBelectronictypeCthinfilmtypeDmaterialtype第14題Withthecontinuousimprovementofpeople'srequirementsforthetechnologicalcontentofvariousproducts,sensorsarealsodevelopingtowardsintelligence.Amongthem,thetypicalintelligentstructuralmodeofsensorsis().AsensorpluscommunicationstechnologyBsensorplusmicroprocessorCsensorplusmultimediatechnologyDsensorpluscomputer第15題Inrecentyears,researchonbiomimeticsensorshasbecomeincreasinglypopular,thiskindofsensormainlyimitatesthe()ofhumanbeing.AvisualorgansBauditoryorgansColfactoryorgansDsensoryorgans第16題Ifthecomputeriscomparedtoanadult’sbrain,thenthesensorcanbecomparedtobe().AeyesBsensoryorgansChandDskin第17題Thesensormainlyimplementstworespects’functions:detectionand().AmeasurementBperceptionCsignaladjustmentDconversion第18題Closelylinkedtoinformationdiscipline,sensingtechnologyisageneraltermfor()andautomaticconversiontechnology.AautomaticadjustmentBautomaticmeasurementCautomaticdetectionDinformationacquisition第19題Amongthefollowingsensors,whichisnamedbyworkingprinciple?()AstraingaugesensorBchemicalsensorCvelocitysensorDenergycontrolsensor第20題Whattherepresentingwayscanbeusedformeasurementerror?ArelativeerrorBabsoluteerrorCfull-scaleerrorDdecibelerror正確答案：AB第21題Whattherepresentingwayscanbeusedforrelativeerror?AactualrelativeerrorBindicationrelativeerrorCfull-scalerelativeerrorDabsoluteerror正確答案：ABC第22題Duringoperation,sensormustabidebysomebasicphysicallaws,including().ALawofConservationofEnergyBLawofInductioninElectromagneticFieldsCOhm'sLawDHooke'sLaw正確答案：ABCD第23題Sofar,sensorandsensortechnology,automaticmeasurementtechnologyhavegainedextensiveapplications,amongthefollowingfields,whichfielddoapplythesensingtechnology?()AindustrialfieldBmarinedevelopmentfieldCaerospacetechnologyfieldDmedicaldiagnostictechnologyfield正確答案：ABCD第24題Amongthefollowing,whicharethesensorclassification?()AclassifiedbyinputquantityBclassifiedbyworkingprincipleCclassifiedbyoutputquantityDclassifiedbyenergyconversionrelationship正確答案：ABCD第25題Themainfunctionofsensingtechnologyare().AThesensingtechnologyisanimportantmeansofproductinspectionandqualitycontrolBThesensingtechnologyiswidelyusedinmonitoringthesafeandeconomicoperationofsystemsCThesensingtechnologyanddevicesareindispensablecomponentsofautomationsystemsDTheimprovementanddevelopmentofsensingtechnologyaredrivingtheprogressofmodernscienceandtechnology正確答案：ABCD第26題Theresearchcontentsofsensingtechnologymainlyinclude().AinformationacquisitionBinformationconversionCinformationprocessingDinformationtransmission正確答案：ABC第27題Thedevelopmenttrendofsensingtechnologyismainlyshowninthefollowingaspectsof().AimproveandenhancethetechnicalperformanceofsensorsBintegrationofsensorsCconductfundamentaltheoreticalresearchDintelligenceofsensor正確答案：ABCD第28題Sensingtechnologyisaninterdisciplinaryfieldthatintegratesphysics,chemistry,materials,devices,electronics,bioengineering,andothersubjects,involvingcomprehensivetechnologiessuchas().AsensordetectionprincipleBdevelopmentandapplicationofsensorsCsaleandafter-salesserviceofsensorsDsalesandafter-salesserviceofsensors正確答案：ABC第29題Whatarethethreetypesoferror?AabsoluteerrorBsystematicerrorCrandomerrorDgrosserror正確答案：BCD第30題Whatarethethreeevaluationmethodsformeasurementresults?AaccuracyBprecisionCprecisenessDcompleteness正確答案：ABC第31題Absolutehumiditymeansabsolutecontentorconcentrationordensityofwatervaporinaunitspace,whichisnormallyrepresentedbyAH.第32題Byusingabsoluteerrortoindicatemeasurementerror,measurementlevelcanbewellshownbyabsoluteerror.第33題Thesmallertheresolutionis,theweakerthesensor'sabilitytodetectnonelectricquantities..第34題Relativehumidityreferstothepercentageofvaporpressureinthemeasuredgasandthesaturatedwatervaporpressureofthegasatthesametemperature,generallyrepresentedbythesymbolRH.第35題Intelligentdoorlockcangenerateatemporarypasswordthatisvalidforashortperiodoftimetoopenthedoor,savingthetroubleofforgettingtobringthekey.Itcanalsodisplayincorrectenterpasswordbynon-usersandgeneratedalarmrecords,etc.第36題Intelligentcameracanremotelymonitorreal-timeupdatesathomeandautomaticallycapturethedynamicsofdoorsandwindows.ItalsocanbecontrolledthroughanAppandactivelycaptureimagesandvideos.第1題Thechargedensitygeneratedonthesurfaceofpiezoelectricquartzcrystalis（）。AproportionaltothecrystalareaBproportionaltothepressureactingonthecrystalCinverselyproportionaltothecrystalthicknessDproportionaltotheremainingpolarizationstrength第2題Therearevariousinitialresistancesforstraingauges,amongwhich()isthemostcommonlyused.A60ΩB120ΩC200ΩD240Ω第3題Thesignalprocessingofpiezoelectricsensorsincludeschargeamplifiersandvoltageamplifiers,andthemaindifferencebetweenthetwointermsofapplicationis().AimpedancetransformationcapabilityBwhethertoincludetheimpactofchangesincablelengthCoutputvoltageandinputvoltageDthreeexplanationsareallincorrect第4題Theconicaltubeoftherotorflowmetermustbe().Auppersmall,lowerbigBupperbig，lowersmallCupperandlowerisconsistentDthefirstthreearefine第5題Thedifferentialpressureflowmeterusesathrottlingdevicetogeneratepressuredrop,andtherelationshipbetweenflowandpressuredifferenceinthepipelineis().AthesquarerootofthepressuredifferenceisproportionalBthepressuredifferenceisproportionalCthepressuredifferenceisinverselyproportionalDtheaveragedifferentialpressureisproportional第6題Whenasolid-statevaristorissubjectedtostressinacertaindirection,itsresistancevaluechangessignificantly.Whatfactorshavecausedsignificantchanges.AresistivityBgeometricdimensionsCelectricchargeonthecrystalsurfaceDpolarizedcharge第7題Piezoelectricsensorsarecurrentlycommonlyusedformeasuring().AstaticforceorpressureBdynamicforceorpressureCspeedDvelocitydisplacement第8題Themainreasonsfortemperatureerrorofstraingaugesisthat().AtheresistancewirehasatemperaturecoefficientBthecoefficientoflinearexpansionofthetestpieceisthesameCresistancewirevarieswithstressdirectionDenvironmentaltemperaturechanges第9題Whenstraingaugesensorusingadjacentdoublearmbridgesfordetection，whichchoicecanachievehighsensitivityandsmallnonlineaerror？AbothbridgearmsshouldusehighresistanceworkingstraingaugesBbothbridgearmsshouldbeconnectedinserieswithtwoworkingstraingaugesCthetwobridgearmsshouldbeusedseparatelyworkingstraingaugeswithoppositestrainDthetwobridgearmsshouldbeusedseparatelyworkingstraingaugeswithsamestrain第10題Piezoelectricsensorscanbeequivalentto().AchargesourceorvoltagesourceBchargesourceorcurrentsourceCcurrentsourceorvoltagesourceDcapacitor第11題Byattachingresistancestraingaugesto(),sensorsformeasuringforce,displacement,acceleration,andotherparameterscanbemadeseparately.AqualityblockBconductorCelasticcomponentDmachinecomponents第12題Semiconductorstraingaugeshaveadvantages,suchas().AhighsensitivityBgoodtemperaturestabilityChighreliabilityDcomplexinterfacecircuit第13題ConnectresistorRandcapacitorCinseriesandthenparalleltotheRCabsorptioncircuitformedbythetwoendsoftherelayorpowerswitch，what'sthefunction?AsuppresscommonmodenoiseBsuppressdifferentialmodenoiseCovercomecrosstalkDeliminateelectricalsparkinterference第14題Theabsolutezerodegreeofpiezoelectricmaterialsisthetemperaturetransitionpointatwhichthe()disappears.ApiezoelectriceffectBinversepiezoelectriceffectCtransversepiezoelectriceffectDlongitudinalpiezoelectriceffect第15題Accordingtodifferentworkingbridgearms,electricbridgescanbedividedinto().AhalfbridgesinglearmBhalfbridgedualarmCfullbridgeinputDselectall第16題Whenanalternatingelectricfieldisappliedinthepolarizationdirectionofadielectric,itundergoesmechanicaldeformation.Whentheexternalelectricfieldisremoved,thedeformationofthedielectricdisappears,andthisphenomenoniscalled().AinversepiezoelectriceffectBpiezoelectriceffectCpositivepiezoelectriceffectDpiezoresistiveeffect第17題Whatkindofeffectistheworkingprincipleofresistancestraingaugesmainlybasedon?ApiezoelectriceffectBhalleffectCstraineffectDthermoelectriceffect第18題Thechangeinresistanceofsemiconductormaterialsismainlycausedbythechangein()ofsemiconductormaterials,whichistheworkingprincipleofpiezoresistivesensors.AlengthBresistivityCcrosssectionalareaDgeometricdimensions第19題Reduceoreliminatenonlinearerrors,()canbeused.AincreasethesupplyvoltageBincreasetheresistancevalueofthebridgearmCimprovethebridgearmratioDimprovevoltagesensitivity第20題TheconditionforbalancingaDCbridgeis().AtheratioofadjacentarmresistancesisequalBtheratiooftheresistancebetweenthetwoarmsisequaCtheratioofresistancebetweenadjacentarmsisnotequalDallresistorsareequal第21題TheconditionforbalancingaDCbridgeis().AtheproductoftheresistancevaluesofadjacentbridgearmsisequalBtherelativebridgearmresistanceratioisequalCtheproductoftheresistancevaluesoftherelativebridgearmsisequalDthesumofresistancevaluesofadjacentbridgearmsisequal第22題Whichthefollowingstatementsiscorrectforquartzcrystals?Aapplyingforcealongtheopticalaxisdirection，itdoesnotgeneratepiezoelectriceffect,nordoesitgeneratecharge.BApplyingforcealongtheopticalaxisdirection，itdoesnotproducepiezoelectriceffect,butitwillgeneratechargegeneration.CApplyingforcealongtheopticalaxisdirection,itwillgeneratepiezoelectriceffect,butnochargewillbegenerated.DApplyingforcealongtheopticalaxisdirection,itwillnotonlygeneratepiezoelectriceffectandbutalsogenerateelectriccharges.第23題Whatisthecorrectcomparisonbetweenthepiezoelectriceffectofquartzandpiezoelectricceramics.Athepiezoelectriceffectofpiezoelectricceramicsisbetterthanthatofquartzcrystals,andtheirstabilityisalsobetterthanthatofquartzcrystalsBthepiezoelectriceffectofpiezoelectricceramicsisbetterthanthatofquartzcrystals,buttheirstabilityisnotasgoodasquartzcrystals.Cthepiezoelectriceffectofquartzcrystalsisbetterthanthatofpiezoelectricceramics,buttheirstabilityisalsobetterthanthatofpiezoelectricceramics.Dthepiezoelectriceffectofquartzcrystalisbetterthanthatofpiezoelectricceramic,andtheirstabilityisnotasgoodaspiezoelectricceramic.第24題Whatisthecorrectstatementwhentwopiezoelectriccomponentsareconnectedinseriescomparedtoasinglepiezoelectriccomponent.Awhenconnectedinseries,theoutputvoltageremainsunchanged,andthechargequantityisthesameasthatconnectinginasinglepiezoelectriccomponent.Bwhenconnectedinseries,theoutputvoltageincreasesbyonetime,andthechargequantityisthesameasthatconnectedinasinglepiezoelectriccomponents.Cwhenconnectedinseries,thechargequantityincreasesbyonetime,andthecapacitanceremainsunchanged.Dwhenconnectedinseries,thechargequantityincreasesbyonetime,andthecapacitanceishalfofthatconnectinginasinglepiezoelectriccomponent.第25題Whichthefollowingsignalisapiezoelectricaccelerometersensorsuitableformeasuring?AsuitableformeasuringanyBsuitableformeasuringgradualchangesCsuitableformeasuringdirectcurrentDsuitableformeasuringdynamics第26題Theindicatedvaluesofvariousordinarypressuregaugesare(),alsoknownasgaugepressure,abbreviatedasGP.ArelativepressureBabsolutepressureCstandardairpressureDatmosphericpressure第27題Whatisthecompositionofresistancestraingauges?AsensitivegateBsubstrateCcoverlayerDleadwire正確答案：ABCD第28題Whatarethecompensationmethodsforresistancestraingauges?AcompensationblockcompensationmethodBcircuitcompensationmethodCbridgeroadselfcompensationmethodDtemperaturecompensationmethod正確答案：AC第29題Accordingtodifferentformingmethodsofsensitivegate,therearemainlythreetypesofpiezoresistivesensors:(),(),and().AbodytypeBthinfilmtypeCdiffusiontypeDtypeofobject正確答案：ABC第30題WhatarethecommonPressureUnit?AengineeringatmosphericpressureBstandardatmosphericpressureCagreedmillimetermercurycolumnDagreedmillimeterwatercolumn正確答案：ABCD第31題Piezoelectricmaterialscanbedividedintothreecategories:(),(),and().ApiezoelectriccrystalBpiezoelectricceramicsCpolymerpiezoelectricmaterialsDnewpiezoelectricmaterials正確答案：ABC第32題Piezoelectricsensorisatypical()typesensorbasedon()ofacertaindielectricmaterial.ApassiveBactiveCpiezoelectriceffectDpiezoresistiveeffect正確答案：AC第33題Thephenomenonofgeneratingchargesundertheactionofforcealongtheelectricaxisx-directioniscalled()piezoelectriceffect;Thephenomenonofgeneratingchargesundertheactionofforcealongthey-directionofthemechanicalaxisiscalledthe()piezoelectriceffect.AradialBlongitudinalCtransverseDtangential正確答案：BC第34題Whataretheconnectionformsofpiezoelectriccomponents?AseriesconnectionBparallelconnectionCinterconnectionDcoupling正確答案：AB第35題Themainfunctionofresistancestraingaugesinelectronicscalesistodetectpressureandconvertitintoresistancechanges.第36題Piezoelectricsensorisaforcesensitivesensor.第37題Accordingtothedifferentcharacteristicsofthebridgepowersupply,bridgecircuitscanbedividedintoACbridgeandDCbridgecircuits.第38題Quartzcrystalsexhibitpiezoelectriceffectsalongtheopticalaxis.第39題Therearemainlytwotypesofresistancestraingauges:metalstraingaugesandsemiconductorstraingauges.第40題Themainfunctionofresistancestraingaugesinelectronicscalesistodetectpressureandconvertitintoresistancevariation.第41題Thecommonlyusedmaterialsforthesensitivegateinresistancestraingaugesincludeconstantanandnickelchromiumalloys.第42題Resistancestraingaugesrequirestrictcalibrationbeforeusetoensuretheaccuracyofmeasurementdata.第43題Piezoelectricsensorscanbeusedforstaticmeasurementsaswellasdynamicmeasurements.第44題Duetothehighsensitivityofsemiconductormaterialstotemperature,theirtemperaturestabilityandlinearityaremuchworsethanthoseofmetalresistancestraingauges.Therefore,thetemperatureerrorofpiezoresistivesensorsisrelativelylarge,then,itisnecessaryforthetemperaturecompensation.Chaptertest第1題Therearemanystructuralformsofdifferentialtransformersensors,amongwhich()isthemostwidelyused.AvariablegaptypeBvariableareatypeCscrewtubetypeDvariablemediumtype第2題Thepowersupplyfortheexcitationcoilofthereflectiveeddycurrentsensoris().Adirect-currentBpowerfrequencyalternatingcurrentChighfrequencyalternatingcurrentDlowfrequencyalternatingcurrent第3題Inengineeringtechnology,inductivesensorsarecommonlyusedformeasuring().AvoltageBmagneticfielddegreeCdisplacementDspeed第4題Theworkingprincipleofeddycurrentsensorsisbasedon().AthermalresistanceeffectBHalleffectCphotoelectriceffectDelectromagneticeffect第5題TheoutputoftheMoirefringegratingsensoris().AdigitalpulsetypeBamplitudemodulationtypeCFMtypeDsinewave第6題Eddycurrentsensorscanbedividedinto().AhighfrequencytransmissiontypeandlowfrequencyreflectiontypeBhighfrequencyreflectiontypeandlowfrequencytransmissiontypeCHighfrequencystraintypeandhigh-frequencytransmissiontypeDlowfrequencytransmissiontpyeandhigh-frequencyreflectiontype第7題Gratingcanbedividedinto().AlonggratingBshortgratingCflatgratingDarcgrating第8題Sensorsmadebasedonthe()arecallededdycurrentsensors.AeddycurrentBeddyCeddycurrenteffectDeddyeffect第9題Inagratingsensor,whichcomponentdoesconvertsopticalsignalsintoelectricalsignals?（）ArulergratingBindicatorgratingClightsourceDoptoelectroniccomponent第10題Whichtypeofgratingsensorisusedtomeasureangleorspeed?（）AlineargratingsensorBrotatinggratingsensorCspecialpurposegratingsensorDintelligentgratingsensor第11題Howdoestheinductanceofthecoilchangewhentheairgapbetweentheironcoreandthearmaturedecreasesinaself-sensingsensor?（）AunchangedBreduceCincreaseDunabletodetermine第12題Whataretheoutputcharacteristicsofdifferentialtransformerdisplacementsensors?（）ADCvoltageBACvoltage,ithasalinearrelationshipwithdisplacementCdirectcurrentDpulsesignal第13題Whattypeofmeasurementiscommonlyusedforeddycurrentdisplacementsensors?（）AcontactdisplacementmeasurementBnon-contactdisplacementmeasurementCcontactpressuremeasurementDnon-contacttemperaturemeasurement第14題Whichtypeofsensoriscommonlyusedforstablecontrolofyarntensionintextilemachinery?（）AresistancestrainsensorBgratingsensorCself-sensingsensorDeddyCurrentTransducer第15題WhatarethecharacteristicsofMoirefringe?（）AnonperiodicBlowsensitivityCperiodicDinstability第16題Forthefollowingsensors,whichdoesnotbelongtoworkbasedontheprincipleofelectromagneticinduction?（）AselfsensingdisplacementsensorBeddycurrentdisplacementsensorCsesistancestraintypesensorDtransformertypedisplacementsensor第17題Forthefollowingsteps,whichisthemostcriticalstepwheninstallingagratingsensor?（）AchoosingtheappropriateinstallationlocationBconnectingpowersupplyCdebuggingandmeasuringcircuitDaligningandcalibratinggratingruler第18題Therearemanytypesofinductivesensors,whichcanbedividedintothreetypesbasedontheirstructures:(),(),and().Aself-sensingsensorBdifferentialtransformertypeCeddycurrenttypeDpotentiometertype正確答案：ABC第19題Whatarethethreestructuralformsofself-sensingsensors?AariableairgapinductivesensorBvariableareainductivesensorCspiraltubetypeinductivesensorDreluctancetypeinductivesensor正確答案：ABC第20題Whatarethemeasurementcircuitsofself-sensingsensors?AACbridgeBtransformertypeACbridgeCresonanttypeamplitudemodulationDresonanttypefrequencymodulation正確答案：ABCD第21題Thedifferentialtransformertypesensormostlyadopts()and()circuits.AfullbridgerectificationBdifferentialrectificationChalfbridgerectifierDphasesensitivedetection正確答案：BD第22題Inductivesensorscanmeasurephysicalquantities,suchas().AdisplacementBvibrationCpressureDflowEproportion正確答案：ABCDE第23題Thereasonforgeneratingzeroresidualvoltageis().AtheelectricalparametersofthetwosecondarywindingsofthesensoraredifferentBthegeometricdimensionsofthetwosecondarywindingsofthesensorareasymmetricCnonlinearofmagnetizationcurveofmagneticmaterialsDincreaseofambienttemperature正確答案：ABC第24題Eddycurrentsensorsaremainlydividedintotwocategories:()and().Ahigh-frequencyreflectiontypeBhighfrequencytransmissiontypeClowfrequencyreflectiontypeDlowfrequencytransmissiontype正確答案：AD第25題Besidemeasuringdisplacement,whichthenon-electricquantitycanbemeasurededdycurrentsensors?AthicknessBsurfacetemperatureCspeedDstress正確答案：ABCD第26題Comparedtootherdisplacementsensors，whatarethemainadvantagesofeddycurrenttypesensorinmeasuringdisplacement？Aitcanachievenon-contactmeasurementBsimplestructureCitisnotafraidofpollutionfromoilandothermediaDcanmeasurelargedisplacements正確答案：ABC第27題Gratingsensorsaremainlycomposedof(),(),(),andphotoelectricreceivingcomponents,etc.AlightsourceBlensCgratingpairDindicatorgrating正確答案：ABC第28題WhatarethecharacteristicsofMoirefringe?AdirectionalBsynchronicityCmagnificationDadjustable正確答案：ABCD第29題Whatarethecharacteristicsofgratingsensors?Ahighprecision,largerangeBfastresponse,suitablefordynamicmeasurementCIncrementaltypeDhighrequirementsandhighcosts正確答案：ABCD第30題ThewidthandspacingofMoirefringehasnorelationshipwithtwolinesortherelativepositionandangleoftwoobjects.第31題Gratingsensorscanonlybeusedformeasuringlineardisplacementandcannotbeusedformeasuringrotationalangles.第32題Selfsensingdisplacementsensorsmustbeindirectcontactwiththeobjectbeingmeasuredwhenmeasuringdisplacement.第33題Thesensitivityofdifferentialtransformersensorsislowerthanthatofself-sensingsensors.第34題Thephotoelectriccomponentsofgratingsensorsaremainlyresponsibleforconvertingopticalsignalsintoelectricalsignals.第35題Theworkingprincipleofeddycurrentdisplacementsensorsissimilartothatofheatingprincipleofinductioncooker,bothbasedontheeddycurrenteffect.第36題Inautomatedassemblysystems,displacementsensorsareusuallyusedtodetectthesizeofpartsratherthanassemblyaccuracy.第37題Embedtheinductiveproximityswitchintotheconveyorbelt,andtheinductiveproximityswitchcanworknormally.第38題Thetwooutputsoftheproximityswitch(normallyopenandnormallyclosed)canbeturnedonoroffsimultaneously.第39題Highspeedmovingmetalobjectscanbedetectedbyusinginductiveproximityswitcheswithslowresponsetimeandshortmovementdistance.第40題Inductiveproximityswitchescanbeusedfordetectingnon-metallicmaterials.第41題Accordingtotheworkingprincipleofinductiveproximityswitches,theproblemofmetalandnon-metalmixedmaterialscannotbedetectedbyinductiveproximityswitches.第42題Therearetwotypesofmetrologicalgratingsaccordingtotheirapplicationscope:transmissiongratingsandreflectiongratings.第43題Forthemetrologicalgrating,theyarelonggratingformeasuringlinedisplacementandcirculargratingsformeasuringangulardisplacementaccordingtotheirdifferentpurposes.第44題AsinglephotoelectriccomponentreceivingaMoirFringesignalfromafixedpointcanonlydistinguishchangesinbrightnessandcannotdistinguishthedirectionofmovementofMoirFringe.Therefore,itcannotdistinguishthedirectionofmotionofmovingparts,andcannotaccuratelymeasuredisplacement.第45題Subdivisiontechniquescanbedividedintodirectsubdivisionmethodandresistancebridgesubdivisionmethod.第46題TheintensityvariationofMoirFringeisapproximatelysinusoidal,whichadoptsfurthersubdivisionofelectricalsignalsbyusing"frequencydoublingtechniques".Thiscanimprovemeasurementaccuracyoruseofcoarsergratings.第47題Thewirelessdoorandwindowmagneticsensorconsistsoftwoparts:awirelesstransmissionmodule(mainbody)andamagnetblock(magnet).Generally,themainbodyisinstalledonafixeddoorframe,andthemagnetisinstalledonamovabledoor.（）Chaptertest第1題WhydoHallcomponentstypicallyuseN-typesemiconductormaterialsinsteadofusingconductororinsulatormaterials?Aalthoughtheμoftheconductormaterialislarge,theρisverysmallBAlthoughtheρofinsulatingmaterialsislarge,theμisverysmalCinN-typesemiconductormaterials,themobilityofelectronsishigherthanthatofholes,andμn>μpDIheHallconstantofsemiconductormaterialsislargerthanthatofmetals第2題Atpresent,forthese