弱磁信号的测频方法研究  

Research of Weak Magnetic Signal Frequency Measurement Method

作　　者：葛自强[1] 董浩斌[1] 谭超[2] 

机构地区：[1]中国地质大学(武汉)机械与电子信息学院,武汉430074 [2]中国地质大学(武汉)地球物理与空间信息学院,武汉430074

出　　处：《电测与仪表》2010年第1期9-11,34,共4页Electrical Measurement & Instrumentation

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA12Z129)

摘　　要：为了提高弱磁信号的频率测量精度和稳定性,采用多周期同步和倍频两种方法,结合模拟电路、CPLD和单片机技术,设计了检测弱磁信号的调理电路和测频电路。得到了基于两种测频方法构成的电路的测量数据,并进行了对比。结果显示在当前条件下,多周期测频法更具优势,其测频精度达到10-5。同时证明了高信噪比的弱磁信号检测,才能保证高精度和稳定性的测频要求。For improving the measuring accuracy and stability of frequency of weak magnetic signal, signal detecting conditioning circuit and frequency measuring circuit which is based on Multi-cycle synchronization method and frequency doubling method, combined with analog circuits, CPLD and microprocessor technology are designed. Measured data of two frequency methods are got and contrasted at last. In current conditions, results showed that the multi-cycle synchronization method is superior to frequency doubling method, and its accuracy is 10^-5. It＇s also confirmed that weak magnetic signal detecting should have high SNR in order to ensure high accuracy and stability of the frequency measuring requirement.

关 键 词：弱磁信号 多周期同步方法 倍频 

分 类 号：TH763[机械工程—仪器科学与技术]