核电子学与探测技术
覈電子學與探測技術
핵전자학여탐측기술
NUCLEAR ELECTRONICS & DETECTION TECHNOLOGY
2014年
11期
1343-1346
,共4页
DDS%核磁共振录井仪%FPGA%信号发生器
DDS%覈磁共振錄井儀%FPGA%信號髮生器
DDS%핵자공진록정의%FPGA%신호발생기
direct digital frequency synthesis%NMR logging%FPGA%signal generator
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。
為改變覈磁共振錄井儀中信號髮生器置頻速率低、輸齣頻率和波形單一和信號參數需要儀器測量等現狀，研製瞭一種基于FPGA和DDS技術的多信號髮生器。該儀器繫統採用存儲器數據壓縮技術，併運用流水線結構和液晶實時顯示技術，實現瞭多波形輸齣、波形及其相關參數實時動態顯示的功能；同時具有體積小、功耗低的特點，為覈磁共振錄井儀的進一步改進創造瞭條件。
위개변핵자공진록정의중신호발생기치빈속솔저、수출빈솔화파형단일화신호삼수수요의기측량등현상，연제료일충기우FPGA화DDS기술적다신호발생기。해의기계통채용존저기수거압축기술，병운용류수선결구화액정실시현시기술，실현료다파형수출、파형급기상관삼수실시동태현시적공능；동시구유체적소、공모저적특점，위핵자공진록정의적진일보개진창조료조건。
The current signal generator,which is used in nuclear magnetic resonance ( NMR) logging instru-ment,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 devel-oped 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 characteris-tics of small volume and low power consumption.These provide a good chance for the further improvement of NMR logging instrument.
