摘要
根据大功率核磁共振找水仪发射机工作要求,设计了控制系统,由DDS芯片产生频率为当地拉莫尔频率的信号,应用微处理器STC89C54、计数器和相关逻辑电路实现了对发射时间、发射相位及死区时间的巧妙控制,并为发射机H桥主电路提供了准确的控制信号。
According to the working requirement of the big power nuclear magnetic resonance seeking water instrument, we designed the control system. Be puUcd the signal of the Lamor frequency for the region frequency created by the DDS chip. Applied microprocessor STC89C54, counted machine and related logic electric circuits to control the shoot time, shoot phrase and the died area time skillful, provide the accurate control signal for the main electric circuit of the H bridge.
出处
《自动化与仪器仪表》
2009年第3期58-60,共3页
Automation & Instrumentation
关键词
核磁共振
DDS
同相位发射
死区时间
Nuclear magnetic resonance
（NMR）
DDS
Same phase shoot
Die area
