| 低频微弱信号高精度检测研究 |
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| 引用本文： | 郎平,韩磊,李岩.低频微弱信号高精度检测研究[J].北京理工大学学报,2020,40(2):150-156. |
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| 作者姓名： | 郎平 韩磊 李岩 |
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| 作者单位： | 1. 北京理工大学 信息与电子学院, 北京 100081; |
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| 基金项目： | 国家部委基础科研资助项目（JCKY2017602C017） |
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| 摘 要： | 复杂环境下高精度检测低频微弱信号非常重要，本文针对目前低频微弱信号检测系统精度低、检测方法繁琐、仪器价格昂贵等问题，设计了一种用于500 Hz以下、幅值为0.01 nA或者mV级低频微弱信号高精度检测系统.对实际环境中低频微弱信号测量的噪声源及抗干扰措施进行了理论分析；其根据低频微弱信号特点和抗干扰措施设计了一种低频微弱信号高精度检测系统；最后，通过调试实验和人体脉搏信号测试验证了检测系统的性能.测试结果表明，该检测系统能够实现500 Hz以下、幅值为0.01 nA或者mV级的低频微弱信号检测，检测误差低于0.5%；人体脉搏信号检测输出信噪比为（60±2） dB，均方根误差小于5×10-4，信号细节特征信息完整.由此得出，该检测系统具有精度高、抗干扰性强、稳定性好、实用性强、操作简单、价格低廉等特点.
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| 关 键 词： | 低频微弱信号 检测系统 信号处理 脉搏信号 |
Research on High Accurate Measurement for Low Frequency and Weak Signal |
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| LANG Ping,HAN Lei and LI Yan.Research on High Accurate Measurement for Low Frequency and Weak Signal[J].Journal of Beijing Institute of Technology(Natural Science Edition),2020,40(2):150-156. |
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| Authors: | LANG Ping HAN Lei and LI Yan |
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| Affiliation: | 1. School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China;2. School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China;3. School of Materials Science&Engineering, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | The measurement of low frequency weak signal (MLFWS), especially in complex circumstances, has universal application in contemporary research. In this paper, a high accurate detection system (HADS), used in MLFWS with an amplitude of 0.01 nA or mV below 500 Hz, has been designed, based on the shortcomings of MLFWS including low accuracy, complex procedures, expensive equipment and so on at present. First of all, the noise sources and anti-interference actions of MLFWS in real environments were analyzed theoretically; secondly, HADS, used in MLFWS, was designed, based on the characteristics of MLFWS and anti-interference measures; finally, the performances of HADS were tested by debugging and human-based pulse signal detection experiments. The results demonstrate that HADS could achieve the detection error of less 0.5%, in the MLFWS with amplitude of 0.01 nA or mV below 500 Hz.The signal and noise ratio (SNR)was(60±2 )dB, and root mean square error(RMSE) was less than 5×10-4, in the measurement of human-based pulse signal. In conclusion, HADS has excellent characteristics, including high accuracy, good anti-interference, stability, practicality, easy operation, low price and so on. |
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| Keywords: | low frequency weak signal detection system signal processing pulse signal |
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