基于Simulink的连续波电子顺磁共振信号处理与检测仿真研究

doi:10.11938/cjmr20243135

摘要/Abstract

摘要：

根据连续波电子顺磁共振（CW-EPR）系统信号传输与检测的过程，通过Simulink平台构建了CW-EPR系统信号传输、调制与检测的仿真模型．该仿真模型涵盖了信号源模拟、调制、肖特基二极管检波器的检波以及基于锁相放大器的解调过程．基于该模型对调制幅度和调制相位变化下的5,5-二甲基吡咯啉氮氧化物（DMPO）样品波谱信号变化过程进行了评估．仿真结果表明针对不同的调制幅度和调制相位，波谱信号的仿真结果与实际测量结果保持一致．因此，本文建立的CW-EPR信号传输与检测仿真模型为深入理解CW-EPR现象、优化实验参数以及指导CW-EPR实验提供了理论支撑，可为后续研究中EPR系统设计与优化提供参考．

关键词: 连续波电子顺磁共振（CW-EPR）, 系统仿真, 波谱信号处理与检测, Simulink平台

Abstract:

A simulation model of the CW-EPR (continuous wave electron paramagnetic resonance) system’s signal transmission, modulation, and detection is constructed using the Simulink platform. The model supports signal source simulation, modulation, detection by the Schottky diode detector, and lock-in amplifier-assisted demodulation. Using this model, we characterize how 5,5-dimethyl-1-pyrroline N-oxide (DMPO) samples’ spectra vary with modulation amplitudes and phases. Consistency is observed between the simulated and experimentally measured spectral signals over a range of modulation amplitudes and phases. The presented simulation model offers theoretical support for understanding CW-EPR phenomenon in depth, optimizing experimental parameters, and guiding CW-EPR experiments. It also provides a reference for designing and optimizing EPR systems in subsequent research.

Key words: continuous wave electron paramagnetic resonance (CW-EPR), system simulation, spectrum signal processing and detection, Simulink

中图分类号:

O482.53

陈博, 刘泉, 马蕾, 陈淑年, 贾亚琦, 朱斌, 郭俊旺. 基于Simulink的连续波电子顺磁共振信号处理与检测仿真研究[J]. 波谱学杂志, 2025, 42(2): 174-183.

CHEN Bo, LIU Quan, MA Lei, CHEN Shunian, JIA Yaqi, ZHU Bin, GUO Junwang. Simulink-based Simulation Study of Continuous Wave Electron Paramagnetic Resonance Signal Processing and Detection[J]. Chinese Journal of Magnetic Resonance, 2025, 42(2): 174-183.

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模块	参数	数值
模拟输入信号源	调制频率	100 kHz
	调制幅度	2×10^-4T
	调制相位	0˚
	微波频率	1 MHz
检波模块	二极管正向电压	0.2 V
	二极管导通电阻	0.0001 Ω
	电容	5e-5 F
	并联电阻	1 Ω
LIA模块	参考频率	100 kHz
	参考幅度	2×10^-4T
	参考相位0	0˚
	参考相位1	90˚
	低通滤波阶数	3
	低通滤波截止频率	60 rad/s