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Design of a digital filter for optically pumped helium magnetometers

GUO Qi, DENG Xiao-Dan, LI Xue-Yan, LUAN Xiao-Dong, LI Meng, LI Bing, XIE Min-Ying, FAN Zheng-Yi

图14 用于二次谐波信号提取的锁相放大器

Fig.14 Lock-in amplifier for second harmonic signal extraction