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山东大学学报 (工学版) ›› 2017, Vol. 47 ›› Issue (5): 173-178.doi: 10.6040/j.issn.1672-3961.0.2017.296

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基于高调制频率的双通道数字锁相算法

张晓莉,全伟,刘刚   

  1. 北京航空航天大学仪器科学与光电工程学院, 北京 100191
  • 收稿日期:2017-02-10 出版日期:2017-10-20 发布日期:2017-02-10
  • 作者简介:张晓莉(1991— ),女,山东日照人,硕士研究生,主要研究方向为微弱信号处理.Email:zhangxiaoli@buaa.edu.cn
  • 基金资助:
    国家自然基金委重大仪器专项资助项目(61227902)

Dual-channel digital lock-in algorithm based on high-modulation frequency

ZHANG Xiaoli, QUAN Wei, LIU Gang   

  1. School of Instrument Science and Opto-Electronics Engineering, Beihang University, Beijing 100191, China
  • Received:2017-02-10 Online:2017-10-20 Published:2017-02-10

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摘要： 为提高数字锁相放大器的最大调制频率,并同时快速检测双频复合信号,提出一种基于方波参考的快速数字锁相算法。该算法设置四路参考信号,其中两路为频率为f的正交参考信号,两路为频率为2f的正交参考信号。设置两个调制频率分别为(2a-1)f和(4b-2)f,同时对平均滤波器的长度进行设置,避免通道之间产生干扰。试验表明,该算法能同时检测双频复合信号中每个分量的幅值和相位,且幅值误差小于0.7%,相位误差小于0.5%。相敏检波过程中的乘法运算被加法和减法替代,提高数字锁相算法的运算速度,有效扩大锁相放大器的检测带宽。

关键词: 数字锁相放大器, 双通道, 调制频率, 微弱信号检测, 平均滤波器

Abstract: In order to increase the maximum modulation frequency of digital lock-in amplifier and detect dual-frequency composite signal simultaneously, a fast digital lock-in algorithm based on square wave reference was proposed. There were four reference signals with frequencies of f and 2f respectively. Two modulation frequencies were set to (2a-1)f and ((4b-2)f respectively, and limited the length of the average filter to avoid interference between the channels. The results of the experiments showed that the proposed algorithm could detect the amplitude and phase of each frequency component of the input signal, and the errors of the amplitudes were less than 0.7% and the errors of the phase were less than 0.5%. It replaced the multiplication by additions and subtractions in the phase-sensitive detection improved the speed of the digital lock-in amplifier and effectively expanded the detection bandwidth of the lock-in amplifier.

Key words: digital lock-in amplifier, dual-channel, modulation frequency, weak signal detection, average filter

中图分类号: 

  • TP206
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