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Etalon fringe removal of tunable diode laser multi-pass spectroscopy by wavelet transforms

机译：小波变换去除可调谐二极管激光多遍光谱的Etalon条纹

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摘要

Tunable diode laser absorption spectroscopy (TDLAS) is an important technique for trace gas detection. The sensitivity of TDLAS system, especially for multi-pass absorption, is usually limited by optical fringes. It is an effective approach to suppressing optical fringes of spectral lines using digital filtering. The parameters derived from filtering simulations are key factors and they are related to the noise characteristic. In the paper, the precise Airy functions were used to simulate optical interference and the interference signal was effectively minimized by the wavelet transforms. The root-mean-square error and the residual standard deviation are introduced to quantify the suppression ratio of etalon fringes. It is demonstrated that the optimum wavelet function in denoising the observed CO2 lines is fk18, in comparison with haar, db02, coif1 etc. In addition, the absorption signals recorded by direct absorption spectroscopy and wavelength modulation spectroscopy at second-harmonic (WMS-2f) with a 10 m White-type cell were subjected to low-pass, averaging and fk18 wavelet filtering, respectively. The results show that only wavelet transform is capable of suppressing optical interference noise. The detection limit of WMS-2f can reach 7 ppm and the perfect calibration curves between signal intensity and gas concentration are obtained after wavelet filtering. To further demonstrate the feasibility of the approach, spectral signals at different pressures and temperatures were acquired and the etalon interference is substantially eliminated by fk18 wavelet at 13th level of decomposition.
机译：可调二极管激光吸收光谱法（TDLAS）是检测痕量气体的重要技术。 TDLAS系统的灵敏度，特别是对于多次通过吸收，通常受到光学条纹的限制。这是一种使用数字滤波抑制谱线光学条纹的有效方法。滤波仿真得出的参数是关键因素，它们与噪声特性有关。在本文中，精确的艾里函数被用来模拟光学干涉，并且通过小波变换有效地最小化了干涉信号。引入均方根误差和残留标准偏差以量化标准具条纹的抑制率。结果表明，与haar，db02，coif1等相比，用于去除观测到的CO2线的最佳小波函数是fk18。此外，在二次谐波（WMS-2f）下通过直接吸收光谱和波长调制光谱记录的吸收信号）分别对10 m的White型单元进行低通，平均和fk18小波滤波。结果表明，只有小波变换才能抑制光学干扰噪声。小波滤波后，WMS-2f的检出限可达到7 ppm，并在信号强度和气体浓度之间获得了理想的校准曲线。为了进一步证明该方法的可行性，获得了在不同压力和温度下的光谱信号，并通过在第13级分解的fk18小波基本上消除了标准具干扰。

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  • 来源
    《Optical and quantum electronics》 |2018年第7期|275.1-275.11|共11页
  • 作者

    Li Chuanliang; Guo Xinqian; Ji Wenhai; Wei Jilin; Qiu Xuanbing; Ma Weiguang;

  • 作者单位

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China;

    China Univ Petr, Coll Control Engn, Qingdao 266580, Peoples R China;

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China;

    Shanxi Univ, State Key Lab Quantum Opt & Quantum Opt Devices, Inst Laser Spect, Taiyuan 030006, Shanxi, Peoples R 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

    TDLAS; Multi-pass cell; Wavelet denoising; Optical fringes;

    机译：TDLAS;多次通过单元;小波去噪;光学条纹;

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