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1、2012InternationalConferenceonIndustrialControlandElectronicsEngineeringAnRFcircuitforOverhausermagnetometerexcitation*WangJiaoni,ZhouQianweiZhangShuangCollegeofElectronicScienceandEngineeringCollegeofElectronicScienceandEngineeringJilinUniversity,JilinUniversity,Changchun,ChinaChan
2、gchun,Chinae-mail:zhangshuang@jlu.edu.cnAbstract—Overhausermagnetometerisadeviceformagetostaticfieldmeasurement,RFexcitationisnecessaryfornitrogenoxygenfreeradicalsolution.Inthispaper,designmethodscoupledwithsimulationsofaRFcircuitsusedinOverhausermagnetometerarepresented.Functiona
3、lly,aRFcircuitconsistsofthreeparts,namelyRFsignalsource,RFpoweramplifierandtheload.Generationofa70MHzRFsignalwillbedescribed.Figure.1StructureofRFcircuitofOverhausermagnetometerPoweramplificationaimedtoacquirethegainof13-16dBwillbepresented.Finallywegetacontinuoussinewaveof70MHz,4-
4、5W.WehavevalidatedthatalinearpolarizationmagneticfieldissuccessfullygeneratedinsidethebirdcagecoilwhichmeetstherequirementsoftheOverhausermagnetometer.InthispaperanumberofconclusionsarebasedonRFcircuitsimulationsoftwareADS.Keywords-Overhausermagnetometer;radiofrequency(RF);birdcage
5、coil;excitationFigure.2Ellipticfilterof70MHzI.INTRODUCTIONThecircuithastwocorecomponents:AD9851andMRF136,anditcanbedividedinto3parts.ThefirstpartisOverhausermagnetometerhasbecomethestandardhigh-RFsignalsource.TheRFsignalisgeneratedbyprecisionmagnetometerobservationsystem,whichismai
6、nlyprogrammablechipsAD9851.AD9851canoutputsignalusedinexplorationofmineralresource,explorationofbasinwithfrequencyfromDCto70MHzunderthecontrolofwithoilandgas,engineeringandenvironmentalexploration,MCU.Theamplitudeoffinaloutputsignalisabout3V.detectionofobjectsandpipelinesburiedunde
7、rground,ThesecondpartispoweramplifyingcircuitwhosecoreobservationsofprecursorsofearthquakesandvolcanoandcomponentisMRF136.Afterprimaryamplificationthefinalarchaeology.NowtherearemanystudiesonOverhauseroutputpowercanachieve4-5Wthatcompletelysatisfythemagnetometer[1-4].Overhausermagn
8、etometerhasmanyrequirement
