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锁相放大电路测定电子顺磁共振一阶微分信号

Measurement of EPR first derivative signal based on lock-in amplifier circuit
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摘要 针对电子顺磁共振信号微弱、易被噪声干扰、难测量问题,分析锁相放大电路具有选频、锁定相位、抗干扰能力强等特点,可胜任测量微弱信号.提出由小磁调制技术及锁相放大电路应用于电子顺磁共振的方法,实现测定磁共振一阶微分信号,在工程上具有较强参考与应用价值. The EPR signal was weak,easy to be interfered by noise,and difficult to measure,it analyzed the lock-in amplifier circuit had the characteristics of frequency selection,locked phase,strong anti-interference ability,and can be used to measure weak signals.It proposed a method for applying EPR using a small magnetic modulation technique and lock-in amplifier circuit,and realized the measurement of EPR first derivative signal,it had strong reference and application value in engineering.
作者 白炳良 BAI Bingliang(College of Physics and Information Engineering,Minnan Normal University,Zhangzhou,Fujian 363000,China)
出处 《闽南师范大学学报(自然科学版)》 2020年第2期49-52,共4页 Journal of Minnan Normal University:Natural Science
关键词 锁相放大电路 小磁调制技术 电子顺磁共振 微弱信号检测 lock-in amplifier circuit small magnetic modulation EPR weak signal detection
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