地面核磁共振找水仪放大器匹配方法研究
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摘要
为提高核磁共振找水仪的接收信号质量,结合核磁共振信号微弱、噪声干扰严重的特点,根据微弱信号检测技术、电路低噪声设计和传输线基本原理,着重分析了地面核磁共振找水仪传输线与前置放大器的匹配问题;给出了相应的噪声匹配方案,从噪声和干扰角度对放大器内各模块的级联顺序进行了设计。通过实验验证了该核磁共振找水仪的有效性,监测到的最小信号在470 nV左右。经过波形数据多次叠加,进一步提高了信噪比,整体仪器能检测核磁共振的最小信号为50 nV。
In order to improve the quality of receiving signal for surface nuclear magnetic resonance instrument for groundwater,considering the fact that nuclear magnetic resonance signal is very faint,and often heavily affected by noises and interferences,according to faint signals detection technology,design of low noise circuit and transmission line principle,this thesis focuses on the analysis of matching transmission lines and the preamplifier of the surface nuclear magnetic resonance instrument for groundwater and points out the corresponding solution for noise matching.It gives a design for the cascade order of all blocks of the amplifier from the angle of noise and interference.The performance of NMR(Nuclear Magnetic Resonance) instrument was proved by outdoor experiments,and successfully detect minimum NMR signal at about 470 nV steadily.By adding up more wave signal,we can further reduce noise within signal.The minimum signal we can detect using our nuclear magnetic resonance instrument is 50 nV.
In order to improve the quality of receiving signal for surface nuclear magnetic resonance instrument for groundwater,considering the fact that nuclear magnetic resonance signal is very faint,and often heavily affected by noises and interferences,according to faint signals detection technology,design of low noise circuit and transmission line principle,this thesis focuses on the analysis of matching transmission lines and the preamplifier of the surface nuclear magnetic resonance instrument for groundwater and points out the corresponding solution for noise matching.It gives a design for the cascade order of all blocks of the amplifier from the angle of noise and interference.The performance of NMR(Nuclear Magnetic Resonance) instrument was proved by outdoor experiments,and successfully detect minimum NMR signal at about 470 nV steadily.By adding up more wave signal,we can further reduce noise within signal.The minimum signal we can detect using our nuclear magnetic resonance instrument is 50 nV.
引文
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[13]程德福,林君.智能仪器[M].北京:机械工业出版社,2005:23.CHENG De-fu,LIN Jun.Intelligent Instrum entation[M].Be ijing:M echan ical Industry Press,2005:23.
[14]吴猛.开关电容滤波器的设计与应用[J].集成电路通讯,2005,23(4):30-34.WU M eng.The Design and App lication of the Sw itch Capac itor F ilter[J].Integrated C ircu it Commun ication,2005,23(4):30-34.
[15]宁华申.开关电容滤波器的设计与应用[J].邵阳学院学报:自然科学版,2004,1(1):26-28.NING Hua-shen.The Design and App lication of the Sw itch Capac itor F ilter[J].Journal of Shaoyang Un iversity:Natural Sc i-ences Ed ition,2004,1(1):26-28.
[2]张凯,孔力,周凯波,等.一种核磁共振测井仪前置放大器的研制[J].武汉理工大学学报:信息与管理工程版,2007,29(4):60-71.ZHANG Kai,KONG L i,ZHOU Kai-bo,et al.TheM anufacture ofOne Amp lifier for the Nuc learM agnetic Resonance Instru-m ent forW ell Investigation[J].Journal ofW uhan Un iversity of Technology:Inorm ation and M anagem ent Engineering Ed i-tion,2007,29(4):60-71.
[3]ZEMANIANG A H.Hyper RealW aves on Transfin ite,Term inated,D istortion Less and Lossless,Transm ission L ines:Re-search Artic les[J].International Journal of C ircu it Theory and App lications,2005,33(3):183-193.
[4]黄乘顺,李星亮,蔡益宇.传输线阻抗匹配模型及精确计算[J].通信技术,2007,11(40):119-120,408.HUANG Cheng-shun,LI X ing-liang,CAI Y i-yu.Impedance M atch ingModel and Its Prec ise Computing of Transm ission L ine[J].Commun ications Technology,2007,11(40):119-120,408.
[5]吴广德,傅光.传输线在宽带匹配中的应用[J].电子科技,2007(2):12-14.WU Guang-de,FU Guang.App lications ofTransm ission L ine in B roadband M atch ing[J].E lectron Sc ience and Technology,2007(2):12-14.
[6]黄乘顺,李星亮.传输线阻抗匹配的分析与设计[J].科学技术与工程,2007,7(4)607-609.HUANG Cheng-shun,LI X ing-liang.The Analyses and Design of the Transm ission L ines Impedance[J].Sc ience Technolo-gy and Engineering,2007,7(4):607-609.
[7]叶志琼,郑春华.工控系统串行通信传输线的阻抗匹配技术[J].工业控制计算机,2006,19(10):16-17.YE Zh i-q iong,ZHENG Chun-hua.ImpedanceM atch ing Techn iques of Serial Commun ication in Industry Control System[J].Industry Control Computer,2006,19(10):16-17.
[8]郭玉,赵顺.低噪声前置放大器有源器件的选择[J].电测与仪表,2007,44(6):62-64.GUO Yu,ZHAO Shun.The Choice of Active Device about Lower-Noise Preamp lifier[J].E lectricalM easurem ent&Instru-m entation,2007,44(6):62-64.
[9]方伟,吴毅强.低噪声放大器的设计及仿真[J].科技广场,2007(1):198-199.FANG W e i,WU Y i-q iang.Design and S imu late a Low Noise Amp lifier C ircu it[J].Sc ience and Technology Square,2007(1):198-199.
[10]葛维维,刘佑宝.低噪声运算放大器噪声分析[J].微电子学与计算机,2007,24(2):124-127,131.GE W e i-we i,LIU You-bao.Noise Analysis in Low-Noise Operational Amp lifier Design[J].M icroelectron ic and Computer,2007,24(2):124-127,131.
[11]沈伟慈.通信电路[M].西安:西安电子科技大学出版社,2004:22.SHEN W e i-c i.Commun ication C ircu it[M].X i an:X id ian E lectron Un iversity Pub lish ing House,2004:22.
[12]李威,陈祖斌.宽频地震仪数据采集通道的噪声分析[J].吉林大学学报:信息科学版,2006,24(5):462-465.LIW e i,CHEN Zu-b in.Noise Analysis in Data Acqu isition Channel of B road Band Se ism ic Recorder[J].Journal of Jilin U-n iversity:Inform ation Sc ience Ed ition,2006,24(5):462-465.
[13]程德福,林君.智能仪器[M].北京:机械工业出版社,2005:23.CHENG De-fu,LIN Jun.Intelligent Instrum entation[M].Be ijing:M echan ical Industry Press,2005:23.
[14]吴猛.开关电容滤波器的设计与应用[J].集成电路通讯,2005,23(4):30-34.WU M eng.The Design and App lication of the Sw itch Capac itor F ilter[J].Integrated C ircu it Commun ication,2005,23(4):30-34.
[15]宁华申.开关电容滤波器的设计与应用[J].邵阳学院学报:自然科学版,2004,1(1):26-28.NING Hua-shen.The Design and App lication of the Sw itch Capac itor F ilter[J].Journal of Shaoyang Un iversity:Natural Sc i-ences Ed ition,2004,1(1):26-28.
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