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1、课题一传感器与检测技术的基础理论（Topic1basictheoryofsensoranddetectiontechnology）Topic1basictheoryofsensoranddetectiontechnology1-1thereisadigitalthermometer,itsmeasuringrangeis-50~+150,theaccuracyis0.5.Theabsoluteerrorandtherelativeerrorofindicationvaluewhenthevaluesare-20and+100resp
2、ectively.1-2wanttotest240Vvoltage,requiremeasurementindicationrelativeerrorisnotgreaterthan,asktochoosetherangeof250Vvoltmeter,itsaccuracyforwhatlevel?Iftherangeof300Vand500Vvoltmeterisselected,whatistheaccuracy?1-3itisknownthatthevoltagetobemeasuredisabout80V.Thereare
3、twovoltagemeters,oneis0.5,themeasuringrangeis0~300V,theotheris1,andthemeasuringrangeis0~100V.Whichvoltmeterisbetterformeasurement?Why?1-4useathreebitdigitalelectronicthermometertomeasurethetemperature.ThedigitalpanelshowsthevalueshowninFigure1-1.Theresolutionoftheinstr
4、ument,themeasuredtemperature,therelativeerroroftheindicationvalueandtherelativeerrorofsatisfactionarecalculated.(notice:theupperlimitofthethreedigittableis199.9)1-5thereisameasuringpressureinstrument,themeasuringrangeis,therelationshipbetweenthepressurePandtheinstrumen
5、toutputvoltageisIntheformula,thesolutionisgiven:1)theoutputcharacteristicequationoftheinstrument.2)drawtheoutputcharacteristiccurveschematicdiagram(xaxis,Yaxisshouldbemarkedunit).3)thesensitivityexpressionoftheinstrument.4)drawasensitivitycurvediagram.5)thelinearityoft
6、heinstrument.1-6whatarethecomponentsofthedetectionsystem?Explaintheroleofeachpart.1-7whataretheadvantagesofthenonelectricalmeasurementmethod?1-8whatkindofmeasurementmethodshouldbeadoptedwhenmeasuringtheoutputvoltageofregulatedpowersupplyvaryingwiththeload?Howtoproceed?
7、1-9alineardisplacementmeasuringinstrument,whenthemeasureddisplacementischangedfrom4.5mmto5.0mm,theoutputvoltageofthedisplacementmeasuringinstrumentisreducedfrom3.5Vto2.5V,andthesensitivityoftheinstrumentisobtained.1-10atemperaturemeasurementsystemconsistsofthefollowing
8、fourlinks,thesensitivityisasfollows:Platinumresistancetemperaturesensor:Bridge:Amplifier:100(magnification)Penrecorde
