Simulink-based Simulation Study of Continuous Wave Electron Paramagnetic Resonance Signal Processing and Detection

doi:10.11938/cjmr20243135

Abstract

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

CLC Number:

O482.53

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.

Figures/Tables 9

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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