核磁共振地下水探测系统信号源的研制  

Development of Magnetic Resonance Sounding Signal Generator for Groundwater Detector

作　　者：赵义平[1] 王春民[2] 吴海燕 聂彩霞 董磊[2] 

机构地区：[1]水利部牧区水利科学研究所,呼和浩特010105 [2]长春理工大学光电信息学院电子工程分院,长春130061 [3]九江精密测试技术研究所,江西九江332000 [4]长春科技创业服务中心,长春130012

出　　处：《吉林大学学报（信息科学版）》2011年第4期290-296,共7页Journal of Jilin University（Information Science Edition）

基　　金："十一五"国家科技支撑计划重大基金资助项目(2006BAK03A23);吉林省科技支撑计划基金资助项目(20080338)

摘　　要：为模拟产生MRS(Magnetic Resonance Sounding)信号研制JLMRS地下水探测系统,设计了核磁共振信号源,模拟MRS信号,方便JLMRS地下水探测系统室内测试。针对实际MRS信号幅度小,频率分辨率高等特点,信号源硬件采用DDS(Direct Digital Synthesizer)技术,CPLD(Complex Programble Logic Device)编程实现相位累加器,Matlab计算产生模拟MRS波形数据,存入非易失性RAM(Random Access Memory)中,掉电后能保存数据,不用重复下载。信号源可任意改变模拟MRS信号参数,叠加不同信噪比的多种噪声。信号源已获得国家实用新型专利(200820072674.2),并应用于JLMRS地下水探测系统的研制过程。测试结果表明,幅度误差小于0.02 V,频率分辨率可达1 Hz,输出稳定,重复性好,满足系统测试要求。Generator that can generate the MRS（Magnetic Resonance Sounding） signal is design to develop JLMRS groundwater detection system.It is convenient to indoor testing of JLMRS groundwater detection system using simulate MRS（Magnetic Resonance Sounding） signal.Due to the low amplitude and high-resolution frequency of MRS signal,the hardware of generator is based on the principle of DDS（Direct Digital Synthesizer）.The phase accumulator is programmed by CPLD（Complex Programble Logic Device）,the MRS signal data is calculated by Matlab,and then stored in the non-volatile RAM（Random Access Memory）,which can save data after power down,so it is not necessary to repeat downloading.This generator can adjust the amplitude,frequency,delay time constant,and phase of the MRS signal,and it can be added in various noises of different SNR（Singnal to Noise Ratio）.It has been authorized the national utility model patent（200820072674.2）,and was already used in the development of the JLMRS groundwater detection system.It is testified that the amplitude error is lower than 0.02 V,the frequency resolution is 1 Hz,the output is stabilization,can be used repeatedly,and meets the demands of the JLMRS water investigation instrument.

关 键 词：地面核磁共振 地下水 信号源 直接数字频率合成器 

分 类 号：TN393[电子电信—物理电子学]