核磁共振测场仪的计量显示部分

测场仪利用核磁共振（NMR）原理，使用边缘振荡器法对磁场进行测量。计量显示

部分以CPLD 芯片EPM7128SLC84-6 和单片机OM4368BN 为核心部件，使用Verilog HDL

和C 语言设计频率计，测频范围为1MHz~100MHz。通过对共振点处边缘振荡器的振荡频率进行测量，由单片机根据拉莫进动公式计算出磁感应强度，送液晶显示器输出。设计中引入了自动量程转换，减少人工干预程度。

关键词：磁感应强度；核磁共振；拉莫进动；频率测量；自动量程转换

Abstract: The device measures the magnetic field based on the theory of nuclear magnetic

resonance (NMR) and marginal oscillator. The measurement and display part of it takes

EPM7128SLC84-6 and OM4368BN as the core components. It uses Verilog HDL and C language to design a frequency meter, the range of which is from 1MHz to 100MHz. The device can measure the oscillator frequency when the resonance occurs, get the magnetic induction based on the Larmor precession formula, and display it by the Liquid Crystal Display (LCD).The device contains an automatic range changing technology, so it can reduce the degree of manual intervention.

Key words: Magnetic induction, NMR, Larmor precession, Frequency measurement,

Automatic range changing technology

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