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首页> 外文期刊>Optical and quantum electronics >Comparison of digital lock-in amplifier and fast fourier transform algorithms for quartz-tuning-fork enhanced spectroscopy
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Comparison of digital lock-in amplifier and fast fourier transform algorithms for quartz-tuning-fork enhanced spectroscopy

机译：石英调谐叉增强光谱法的数字锁定放大器和快速傅里叶变换算法的比较

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摘要

A near-infrared methane (CH_4) gas sensor system was implemented using a quartz crystal tuning fork (QCTF) based photoelectric detector and a fiber-coupled distributed feedback diode laser emitting at 1.653 μm. Wavelength-modulation with second-harmonic (2f) detection method was investigated. For signal processing, two different demodulation algorithms, i.e. Fast Fourier Transformation (FFT) and digital lock-in amplifier (DLIA), were developed and completely compared for harmonic signal extraction. Experimental results show that the SNR of WMS-2f signals using the proposed FFT algorithm can be improved by 2.5 times on average than the common DLIA method, which agrees well with the theoretical value of 2.7 times achieved with the simulated spectra data. In comparison, the proposed FFT algorithm shows better performance on signal processing efficiency and simplification, when a QCTF was used as a photoelectric detector or an acoustic transducer.
机译：使用基于石英晶晶叉（QCTF）的光电检测器和光纤耦合的分布式反馈二极管激光器在1.653μm下发射的近红外甲烷（CH_4）气体传感器系统。研究了利用二次谐波（2F）检测方法的波长调制。对于信号处理，开发了两个不同的解调算法，即快速傅里叶变换（FFT）和数字锁定放大器（DLIA），以与谐波信号提取相比。实验结果表明，使用所提出的FFT算法的WMS-2F信号的SNR可以平均提高2.5倍，与普通DLIA方法相当，在模拟光谱数据中实现的理论值为2.7次。相比之下，当用作光电检测器或声学换能器时，所提出的FFT算法在信号处理效率和简化方面表现出更好的性能。

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  • 来源
    《Optical and quantum electronics》 |2020年第9期|417.1-417.12|共12页
  • 作者

    Daojun Liu; Ningwu Liu; Sheng Zhou; Jingsong Li;

  • 作者单位

    Department of General Education Anhui Xinhua University Hefei 230088 China;

    Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education Anhui University Hefei 230601 China;

    Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education Anhui University Hefei 230601 China;

    Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education Anhui University Hefei 230601 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Quartz enhance spectroscopy; FFT; DLIA; WMS-2f;

    机译：石英增强光谱;FFT;Dlia;WMS-2F.;

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