光泵磁敏传感器中FPGA调频器设计与实现.pdf

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1、第25卷第11期传感技术学报V01．25No．1lCHINESEJOURNALOFSENSORSANDACTUA'I’ORSNOV．20l22012年11月DesignandRealizationofFrequencyModulatorwithFPGAforOpticallyPumpedMagneto-DependentSensorⅣMingchang一，CHENGD，ZHOUZhijian，WANGJun，HECong，。(1．LaboratoryforGeophysicalInstrumentationofMinistryEducation，JilinUnivers

2、ity，Changchun130026，China；2．ColegeofInstrumentationandElectricalEngineering，JilinUniversity，Changchun130026，China)Abstract：Frequencymodulatorinradiofrequencyisthekey&5vencomponentoftheheliumopticalpumpedmagneto—dependentsensor．FrequencymodulatorwithanalogVCOhassomeissues，suchasfrequencyi

3、nstability，dificultyoftrou—bleshootingandtherequirementofhigh—precisionfrequencymeasurementcircuit；frequencymodulatorwiththeintegratedchiphasthedisadvantagesofthecontrolcomplexityandhigherpowerconsumption；thenfrequencymodulatorwithFPGAhasmanyadvantages，suchashighfrequencystability，withou

4、ttherequirementofhigh—precisionfrequencymeasurementcircuitandintegratedintotheFPGAcontroller．Thispaperpresentsthedigitaldetectingprinciplesofheliumopticalpumpedmagneto-dependentsensorandthetechnicalspecificationsoffrequencymodulator，describestheprincipleofthefrequencymodulatorwithFPGAand

5、realizesthedesign．TheresultsofFMsignaldemodulationexperimentandsweep—typemagneticresonancesignaldetectionexperimentshowthatthefrequencymodulatorwithFPGAmeetsthedigitaldetectingspecificationsoftheheliumopticalpumpedmagneto—dependentsensor．Keywords：magneto—dependentsensor；digitalfrequencym

6、odulator；sweep—typemagneticresonancedetection；FPGAEEACC：7230doi：10．3969／j．issn．1004—1699．2012．011．027光泵磁敏传感器中FPGA调频器设计与实现术连明昌，程德福，周志坚，王君，何聪(1．吉林大学地球信息探测仪器教育部重点实验室，长春130026；2．吉林大学仪器科学与电气T程学院，长春130026)摘要：射频场调频器是氦光泵磁敏传感器核心驱动部件。模拟压控振荡式调频器存在频率不稳、调试困难和需要高精度测频电路等问题，集成芯片调频器存在控制复杂和功耗高等不足，而FPGA调频器

7、具有频率稳定度高、不需要高精度测频电路和集成在FPGA控制器里的优点。提出氦光泵磁敏传感器数字检测原理和调频器技术指标，阐述FPGA调频器原理并完成设计。调频信号解调实验和扫频式磁共振信号检测实验的结果表明FPGA调频器满足氦光泵磁敏传感器数字化检测要求。关键词：磁敏传感器；数字调频器；扫频式磁共振检测；FPGA；中图分类号：TH867文献标识码：A文章编号：1004-1699(2012)11-1618-05氦光泵磁敏传感器¨是以氦原子在外磁场中驱动部件，其频率范围、稳定度和调制性能等指标直的塞曼效应为基础，利用光泵和磁共振作用研制而接影