A Multi-frequency WMS Method for Tunable Diode Laser Absorption Spectroscopy Tomography

2019 IEEE International Conference on Imaging Systems and Techniques (IST) Pub Date : 2019-12-01 DOI:10.1109/ist48021.2019.9010545

Ang Huang, Z. Cao, Wenshuai Zhao, Lijun Xu

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Abstract

In this paper, a multi-frequency wavelength modulation spectroscopy (WMS) method for tunable diode laser absorption spectroscopy (TDLAS) tomography was proposed. Multiple wavelengths modulated at different frequencies were used to extract the absorption spectrums in parallel along various laser paths. For a five-view fan-beam TDLAS sensor, the wavelength of incident laser was respectively modulated by the high-frequency sinusoidal signal at six different frequencies to separate absorption spectrums at different angles and different wavelengths and then distributions of temperature and water vapor's molecules concentration can be reconstructed. The framerate of the proposed multi-frequency WMS method for image reconstruction is ten times faster than single-frequency WMS method with cascade laser scanning. Numerical simulations were conducted to verify the effectiveness of the proposed method with two absorption spectra of water molecule, $\nu$ 1=7185 cm−1 and $\nu$ 2=7444 cm−1. Three different distributions of temperature and water vapor's molecules concentration were fabricated and reconstructed.

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可调谐二极管激光吸收光谱层析成像的多频WMS方法

提出了一种可调谐二极管激光吸收光谱(TDLAS)层析成像的多频波长调制光谱(WMS)方法。利用不同频率调制的多波长沿不同激光路径平行提取吸收光谱。对于五视点扇形光束TDLAS传感器，采用高频正弦信号在6个不同频率分别调制入射激光的波长，分离不同角度和不同波长的吸收光谱，重建温度和水汽分子浓度的分布。所提出的多频WMS图像重建方法的帧率比单频WMS方法在级联激光扫描下的帧率快10倍。用$\nu$ 1=7185 cm−1和$\nu$ 2=7444 cm−1两个水分子吸收光谱进行了数值模拟，验证了所提出方法的有效性。制备并重建了三种不同的温度和水汽分子浓度分布。

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2019 IEEE International Conference on Imaging Systems and Techniques (IST)

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