LC谐振参量的直观测量方法
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摘要
LC回路是磁共振实验的关键信号检测单元,理解LC电路的幅频和相频特性是掌握核磁共振实验技术原理的重要环节.借助数字存储示波器实时测量信号参量功能,实验方案1提供了简易直观的谐振参量测量方法;利用双通道锁相放大器及其参考同步功能,实验方案2进一步展示了直观测量的教学可操作性.采用不同的幅值表示方法和相位差测量方法,既突出不同技术手段的原理共性,又体现近代物理实验课程承上启下的桥梁作用.
LCcircuit is the key electric unit for signal detection in magnetic resonance experiment,and it is important to accurately understand its amplitude-frequency and phase-frequency characteristics for the comprehension of the principle of NMR technology.Using digital oscilloscope for real-time measurement of waveform parameters,experiment scheme 1 provided a simple and intuitive technique for measuring LCcircuit resonant characteristics,and experiment scheme 2 further demonstrated the operability of intuitive measurement method in teaching experiment by using dual-channel lock-in amplifier.The representation methods of waveform amplitude and phase difference in two schemes not only emphasized the commonness in experimental principle,but also reflected the bridge role of modern physics experiment in undergraduate course.
LCcircuit is the key electric unit for signal detection in magnetic resonance experiment,and it is important to accurately understand its amplitude-frequency and phase-frequency characteristics for the comprehension of the principle of NMR technology.Using digital oscilloscope for real-time measurement of waveform parameters,experiment scheme 1 provided a simple and intuitive technique for measuring LCcircuit resonant characteristics,and experiment scheme 2 further demonstrated the operability of intuitive measurement method in teaching experiment by using dual-channel lock-in amplifier.The representation methods of waveform amplitude and phase difference in two schemes not only emphasized the commonness in experimental principle,but also reflected the bridge role of modern physics experiment in undergraduate course.
引文
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[16]李潮锐.连续波核磁共振吸收的频域测量[J].物理实验,2017,37(10):26-29.
[2]程亚洲,徐建强,咸夫正,等.RLC串联谐振电路实验的相关问题探讨[J].物理实验,2017,37(6):32-33,42.
[3]李潮锐.数字示波器测量RLC谐振特性[J].物理实验,2018,38(4):24-26,29.
[4]李潮锐.数字电桥测量LC谐振特性[J].物理实验,2017,37(12):21-24.
[5]李潮锐.用锁相放大器测量材料介电参量[J].物理实验,2018,38(3):15-17,20.
[6]李潮锐.近代物理实验[M].广州:中山大学出版社,2004.
[7]杨文明,王宇兴,王瑗,等.F-H实验测量方案的改进[J].物理实验,2016,36(10):5-7.
[8]冯娟,张贺,赵飞.夫兰克-赫兹实验的改进[J].物理实验,2014,34(9):39-41.
[9]蒲贤洁,刘高斌,何光宏,等.弗兰克-赫兹实验不稳定状态的应对措施[J].物理实验,2017,37(7):1-5.
[10]王思慧,范文凯,江洪建,等.基础实验题B:线性及非线性LC振荡电路[J].物理实验,2018,38(9):38-42.
[11]王自鑫,陈泽宁,王健豪,等.基于数字锁相放大技术的强噪声背景下检测微弱信号教学实验[J].物理实验,2016,36(3):1-4.
[12]查述传,孔立新.光学实验中应用锁相放大技术的初步探索[J].物理实验,1986,6(2):49-50.
[13]李潮锐.电光调制通信的频谱测量[J].物理实验,2017,37(6):28-31.
[14]丁沅,林逢琦.锁相放大器在光谱实验中的一个应用[J].物理实验,1989,9(2):49-50.
[15]李潮锐.微波电子自旋共振的微分测量[J].物理实验,2017,37(3):21-24.
[16]李潮锐.连续波核磁共振吸收的频域测量[J].物理实验,2017,37(10):26-29.