您的位置：山东大学 -> 科技期刊社 -> 《山东大学学报（工学版）》

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

• • 上一篇    下一篇

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

PDF (PC)

390

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
[1] COVA S, LONGONI A, FREITAS I. Versatile digital lock-in detection technique: application to spectrofluorometry and other fields [J]. The Review of Scientific Instruments, 1979, 50(3):296.
[2] DÍAZ-MICHELENA M, COBOS P, AROCA C. Lock-in amplifiers for AMR sensors[J]. Sensors & Actuators a Physical, 2015, 222(222):149-159.
[3] BARRAGÁN L A, ARTIGAS J I, ALONSO R, et al. A modular, low-cost, digital signal processor-based lock-in card for measuring optical attenuation[J]. Review of Scientific Instruments, 2001, 72(1):247-251.
[4] TONG I O, LEE J W, KIM K S, et al. Digital phase-sensitive demodulator for electrical impedance tomography[J]. International Conference of the IEEE Engineering in Medicine and Biology Society, 2003, 2(2):1070-1072.
[5] 刘文亮, 朱维红, 陈涤,等. 基于雷达图像的运动目标形态检测及跟踪技术[J]. 山东大学学报(工学版), 2010, 40(3):31-36. LIU Wenliang, ZHU Weihong, CHEN Di, et al. Detection and tracking of moving targets using the morphology match in radar images[J]. Journal of Shandong University(Engineering Science), 2010, 40(3):31-36.
[6] ANDERSON M, PERSON L, SEVEVSON T, et al. Flexible lock-in detection system based pm synchronized computer plug-in boards applied in sensitive gas[J]. Review of Scientific Instruments, 2007, 78(11):113107.
[7] 李刚,张丽君,林凌.一种新型数字锁相放大器的设计及其优化算法[J].天津大学学报(自然科学与工程技术版),2008,41(4):429-432. LI Gang, ZHANG Lijun, LIN Ling. Design of a new digital lock-in amplifier and its optimization algorithm[J]. Journal of Tianjin University(Science and Technology), 2008, 41(4):429-432.
[8] LI Gang, ZHOU Mei, HE Feng, et all. A novel algorithm combining oversampling and digital lock-in amplifier of high speed and precision[J]. The Review of scientific instruments, 2011, 82(9): 095106
[9] AYAT M, KARAMI M A, MIRZAKUCHAKI S, et al. Design of multiple modulated frequency lock-in amplifier for tapping-mode atomic force microscopy systems[J]. IEEE Transactions on Instrumentation & Measurement, 2016, 65(10):2284-2292.
[10] KAR A, GOEL P, CHANDRA M, et al. A low-cost, portable alternative for a digital Lock-In amplifier using TMS320C5535 DSP[C] //TENCON 2014-2014 IEEE Region 10 Conference. Bangkok, Thailand: IEEE, 2014:1-5.
[11] SON H H, JUNG I I, HONG N P, et al. Signal detection technique utilizing ‘lock-in’ architecture using 2ωc harmonic frequency for portable sensors[J]. Electronics Letters, 2010, 46(13):891-892.
[12] GASPAR J, CHEN S F, GORDILLO A, et al. Digital lock in amplifier: study, design and development with a digital signal processor [J]. Microprocessors & Microsystems, 2004, 28(4):157-162.
[13] WANG J, WANG Z, JI X, et al. A simplified digital lock-in amplifier for the scanning grating spectrometer [J]. Review of Scientific Instruments, 2017, 88(2):023101.
[14] KUMBHARE P, SARWADE N, SHARMA A K, et al. Simulation of lock in amplifier(LIA)for very low signal measurements[C] //International Conference on Communications and Signal Processing. [S.l.] , IEEE, 2015:1291-1295.
[15] CLARKSON P, ESWARD T J, HARRIS P M, et al. Software simulation of a lock-in amplifier with application to the evaluation of uncertainties in real measuring systems[J]. Measurement Science & Technology, 2010, 21(21):045106.
[16] SCHULTZ K D. Phase-sensitive detection in the undergraduate lab using a low-cost microcontroller[J]. American Journal of Physics, 2015, 84.
[17] 宋楠,隋越,董明,等. 基于虚拟锁相放大器的中红外CO检测系统[J]. 光电子·激光, 2014(12):2343-2349. SONG Nan, SUI Yue, DONG Ming, et al. Amid-infrared carbon oxide detection system based on virtual lock-in amplifier technology [J].Journal of Optoelectronics Laser, 2014(12):2343-2349.
[18] ZHANG S, LI G, LIN L, et al. Optimization of a digital lock-in algorithm with a square-wave reference for frequency-divided multi-channel sensor signal detection[J]. Review of Scientific Instruments, 2016, 87(8):296-488.
[19] LI G, ZHANG S, ZHOU M, et al. A method to remove odd harmonic interferences in square wave reference digital lock-in amplifier[J]. Review of Scientific Instruments, 2013, 84(2):025115.
[20] JIANG G L, YANG H, LI R, et al. A new algorithm for a high-modulation frequency and high-speed digital lock-in amplifier[J]. Measurement Science & Technology, 2016, 27(1):015701.
[1] 王璐,王红,陈国平. 基于全数字移相锁相法的微弱信号检测器[J]. 山东大学学报 (工学版), 2019, 49(4): 24-28.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] 李芳佳, 高尚策, 唐政, 石井雅博, 山下和也. 基于元胞自动化模型的三维雪花晶体近似模式的产生（英文）[J]. 山东大学学报(工学版), 2009, 39(1): 102 -105 .
[2] 孔维涛,张庆范,张承慧 . 基于DSP的空间矢量脉宽调制(SVPWM)的实现[J]. 山东大学学报(工学版), 2008, 38(3): 81 -84 .
[3] 朱向彩,栾云才,徐健 . 基于VB及FTA的城市交通评价系统[J]. 山东大学学报(工学版), 2007, 37(4): 89 -92 .
[4] 李新平 代翼飞 胡静. 某岩溶隧道围岩稳定性及涌水量预测的流固耦合分析[J]. 山东大学学报(工学版), 2009, 39(4): 1 -6 .
[5] 张承慧,宁勇,姬鹏 . 一种改进的FCM聚类算法及其在赤潮预测中的应用[J]. 山东大学学报(工学版), 2007, 37(6): 1 -4 .
[6] 周晓林,曾广周 . 一种基于P2P的工作流管理系统设计[J]. 山东大学学报(工学版), 2007, 37(5): 89 -94 .
[7] 徐奴文 唐春安 周济芳 唐烈先 梁正召. 锦屏二级水电站施工排水洞岩爆数值模拟[J]. 山东大学学报(工学版), 2009, 39(4): 134 -139 .
[8] 蒋鹏飞,王震 . 制造商与不同质供应商博弈分析[J]. 山东大学学报(工学版), 2008, 38(2): 117 -119 .
[9] 高宇 杜爱玲 杨艳玲. 磷化液中ZnO对AZ61镁合金磷化膜的影响[J]. 山东大学学报(工学版), 2009, 39(3): 77 -80 .
[10] 张辉 王孟夏 韩学山. 电力系统的超前热定值及其应用探讨[J]. 山东大学学报(工学版), 2008, 38(6): 25 -29 .
版权所有 © 2018 《山东大学学报(工学版)》编辑部　
地址: 济南市山大南路27号（250100）　 电话: 0531-88366735　 E-mail: xbgxb@sdu.edu.cn
本系统由北京玛格泰克科技发展有限公司设计开发