核磁共振录井仪多信号发生器的设计  

esign of Multi-Signal Generator Applied in NMR Logging Instrument

作　　者：蔡剑华[1] 王先春[1] 

机构地区：[1]湖南文理学院信息研究所,常德415000

出　　处：《核电子学与探测技术》2014年第11期1343-1346,共4页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金项目(41304098);湖南省自然科学基金项目(12JJ4034)资助

摘　　要：为改变核磁共振录井仪中信号发生器置频速率低、输出频率和波形单一和信号参数需要仪器测量等现状,研制了一种基于FPGA和DDS技术的多信号发生器。该仪器系统采用存储器数据压缩技术,并运用流水线结构和液晶实时显示技术,实现了多波形输出、波形及其相关参数实时动态显示的功能;同时具有体积小、功耗低的特点,为核磁共振录井仪的进一步改进创造了条件。The current signal generator,which is used in nuclear magnetic resonance（ NMR） logging instrument,has some deficiencies,such as the rate of setting frequency is low and the frequency,waveform of signal is single and the signal parameters are unknown. In order to solve this problem,a DDS signal generator is developed based on FPGA,in which the 4 level line structure,ROM data compression method and real- time display are applied. The test results show that the speed of the accumulator work is raised,and the functions of more waveform output and real- time dynamic display are realized. At the same time,the system has the characteristics of small volume and low power consumption. These provide a good chance for the further improvement of NMR logging instrument.

关 键 词：DDS 核磁共振录井仪 FPGA 信号发生器 

分 类 号：P631[天文地球—地质矿产勘探]