摘要
为提高核磁共振找水仪核磁共振信号频率的测量精度,设计并研制了核磁共振信号频率测量系统。该系统采用等精度测频原理,以CPLD(Complex Programmable Logic Device)为核心处理芯片,整个系统由信号调理电路、CPLD和单片机等构成,实现了核磁信号的整形调理、信号有效段的判断及核磁信号频率测试的功能。测试结果表明,该系统可较准确地测量出核磁信号的频率,其测量精度可达10-5。
In order to improve the measuring accuracy of received signal in the instrument based on NMR （ Nuclear Magnetic Resonance） for groundwater exploration, the NMR signal frequency measurement system is designed and developed. The equal accuracy frequency measurement is used, and the CPLD （Complex Programmable Logic Device） is designed as the core processing chip for the frequency measurement system. The whole system composed of the signal adjustment circuit, the CPLD and single-chip microcomputer, can realize the NMR signal adjustment, signal valid segment＇s judgement and frequency measurement. Test results show that the system can accurately measure the NMR signal frequency, and the accuracy of can be 10^-5.
出处
《吉林大学学报（信息科学版）》
CAS
2008年第5期448-453,共6页
Journal of Jilin University（Information Science Edition）
基金
"十一五"国家科技支撑计划基金资助项目(2006BAK03A23)
关键词
核磁共振
信号调理
频率测量
可编程逻辑器件
单片机
nuclear magnetic resonance
signal adjustment
frequency measurement
complex programmable logic device （CPLD）
single-chip microcomputer
