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山东大学学报 (工学版) ›› 2019, Vol. 49 ›› Issue (4): 24-28.doi: 10.6040/j.issn.1672-3961.0.2018.526

• 机器学习与数据挖掘 • 上一篇    下一篇

基于全数字移相锁相法的微弱信号检测器

王璐(),王红*(),陈国平   

  1. 重庆邮电大学光电工程学院, 重庆 400065
  • 收稿日期:2017-09-04 出版日期:2019-08-20 发布日期:2019-08-06
  • 通讯作者: 王红 E-mail:luwang@cqupt.edu.cn;892086798@qq.com
  • 作者简介:王璐(1984—)，男，四川达州人，讲师，博士,主要研究方向为光伏太阳能电池相关技术.E-mail:luwang@cqupt.edu.cn
  • 基金资助:
    重庆市教委科学技术研究资助项目(KJ1600432);重庆市教委自然科学基金资助项目(KJ130507)

Weak signal detector based on all-digital phase-shifting lock-in method

Lu WANG(),Hong WANG*(),Guoping CHEN   

  1. School of Optoelectronic Engineering, Chongqing University of Post and Telecommunications, Chonqging 400065, China
  • Received:2017-09-04 Online:2019-08-20 Published:2019-08-06
  • Contact: Hong WANG E-mail:luwang@cqupt.edu.cn;892086798@qq.com
  • Supported by:
    重庆市教委科学技术研究资助项目(KJ1600432);重庆市教委自然科学基金资助项目(KJ130507)

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摘要：

为改善现有相关锁相检测的相位差不可控性,克服模拟移相电路易受干扰、功耗大等缺点,提出一种基于全数字移相锁相的微弱信号检测方法,将一路模拟相关信号改进为具有频率遍历和同频移相的全数字参考信号,结合锁相相关检测对低信噪比(signal noise ratio, SNR)的微弱信号进行提取。利用直接内存存取(direct memory access, DMA)技术传输参考信号和待测微弱信号,并通过模数转换器(analog to digital converter, ADC)和数模转换器(digital to analog converter, DAC)实现高速率、低功耗的同频数据转换。测试表明,在90 dB的强噪声环境下,该方法可检测有效稳定的最低SNR为-46 dB的微弱信号,可对高噪声环境的工业厂房的无源扬声器进行高精度质量检测。

关键词: 微弱信号检测, 质量检查, 全数字移相, 锁相放大器, 低信噪比

Abstract:

In order to solve the problem of the uncontrollable phase difference in existing lock-in detection and the vulnerable to interference or high power consumption in analog phase-shifting circuit. The lock-in detection equipment based on all-digital phase-shifting method was designed, which the analog correlation signal was replaced by an all-digital reference signal with frequency traversal and co-frequency shift, then combined with the lock-in correlation detection to extract weak signals in low SNR. The reference signal and the weak signal to be tested were transmitted by direct memory access(DMA), the analog to digital converter(ADC) and digital to analog converter(DAC) were used to realize the transmission of synchronous frequency data with low power and faster transfer speed. The results showed that the lowest SNR detectable by this method was -46 dB with good stability and efficiency in a strong noise environment of 90 dB. It had great practical value for high-precision quality testing in high noise environment passive speaker equipment of the industrial plant.

Key words: weak signal detection, quality inspection, digital phase-shifting, lock-in amplifier, low SNR

中图分类号: 

  • TP206

图1

系统框图"

图2

产生1 kHz正弦激励信号流程图"

图3

系统代码流程图"

图4

同频移相正弦参考信号"

图5

1 kHz正弦波激励信号"

图6

检测器实物图"

图7

90 dB环境噪声模拟场景下的检测结果"

图8

无噪声时的检测结果"

表1

纯噪声测试结果"

NOISE/V MAX PAPR
4.2 62 1.41
3.5 44 1.83
3.2 35 1.81
3.0 30 2.41
2.0 13 3.25

表2

90 dB噪声和1 kHz输入信号混合测试结果"

INPUT/V SNR/dB DC/mV MAX PAPR
4.20 0 0~600 74 1.68
2.00 -6 0~450 64 1.70
1.00 -13 0~340 61 1.69
0.50 -19 0~200 53 1.67
0.20 -26 0~100 52 1.62
0.10 -33 0~56 48 1.75
0.05 -40 0~30 40 1.68
0.03 -43 0~15 35 1.65
0.02 -46 0~6 16 1.64
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doi: 10.3390/s17112615
[1] 张晓莉,全伟,刘刚. 基于高调制频率的双通道数字锁相算法[J]. 山东大学学报(工学版), 2017, 47(5): 173-178.
[2] 穆峰, 常发亮, 蒋沁宇. 基于改进EMD算法的信号滤波[J]. 山东大学学报(工学版), 2015, 45(3): 35-42.
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