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Doppler velocimeter based on dual-comb absorption spectroscopy
Photonics Research ( IF 6.6 ) Pub Date : 2020-11-23 , DOI: 10.1364/prj.398876
Chenglin Gu , Xing Zou , Zhong Zuo , Daowang Peng , Yuanfeng Di , Yang Liu , Daping Luo , Wenxue Li

The determination of airflow parameters is essential to the research of critical information on environment monitoring, chemical kinetics, and aerodynamic and propulsion applications. During the past few decades, tunable diode laser absorption spectroscopy has become a common and efficient tool for the flow velocity measurement based on the Doppler shift of the absorption line. Dual-comb absorption spectroscopy (DCAS), as a state-of-the-art Fourier-transform broadband spectroscopic technique, not only can detect multiple trace molecules in parallel but also can extract Doppler shifts to derive the flow velocity through the analysis of dozens of molecular absorption lines simultaneously with high precision. Here, we report a proof-of-principle demonstration of the velocity measurements of acetylene at various flow velocities by means of a high-resolution and broadband DCAS. Mode-resolved Doppler-shifted rotational-vibrational lines in the P branch of acetylene molecules are obtained. A model for multiline Doppler frequency determination is investigated and experimentally verified. The flow velocity measurements with a measuring uncertainty down to the submeter per second over the range from 8.7 m/s to 44.8 m/s at an effective time resolution of 1 s and a measuring uncertainty of 1.97 m/s at 0.1 s are demonstrated. With broadband mid-infrared frequency combs covering atmospheric transmission windows, the open-path measurement for monitoring diffusion of the weak pollutant source would be realized.

中文翻译:

基于双梳吸收光谱的多普勒测速仪

气流参数的确定对于环境监测、化学动力学、空气动力学和推进应用等关键信息的研究至关重要。在过去的几十年中,可调谐二极管激光吸收光谱已成为基于吸收线的多普勒频移进行流速测量的常用且有效的工具。双梳状吸收光谱 (DCAS) 作为最先进的傅里叶变换宽带光谱技术,不仅可以并行检测多个痕量分子,还可以提取多普勒频移,通过对数十个分子的分析得出流速分子吸收谱线的同时高精度。这里,我们通过高分辨率和宽带 DCAS 报告了乙炔在各种流速下的速度测量的原理验证演示。获得了乙炔分子 P 支路中模式分辨的多普勒频移旋转振动线。对多线多普勒频率确定模型进行了研究和实验验证。在 8.7 m/s 到 44.8 m/s 的范围内,以 1 s 的有效时间分辨率和 1.97 m/s 的测量不确定度在 0.1 s 的范围内展示了流速测量的测量不确定度低至每秒亚米级。利用覆盖大气传输窗口的宽带中红外频率梳,实现监测弱污染物源扩散的开路测量。获得了乙炔分子 P 支路中模式分辨的多普勒频移旋转振动线。对多线多普勒频率确定模型进行了研究和实验验证。在 8.7 m/s 到 44.8 m/s 的范围内,在 1 s 的有效时间分辨率和 1.97 m/s 的测量不确定度在 0.1 s 的范围内,流速测量的测量不确定度低至每秒亚米级。利用覆盖大气传输窗口的宽带中红外频率梳,实现监测弱污染物源扩散的开路测量。获得了乙炔分子 P 支路中模式分辨的多普勒频移旋转振动线。对多线多普勒频率确定模型进行了研究和实验验证。在 8.7 m/s 到 44.8 m/s 的范围内,以 1 s 的有效时间分辨率和 1.97 m/s 的测量不确定度在 0.1 s 的范围内展示了流速测量的测量不确定度低至每秒亚米级。利用覆盖大气传输窗口的宽带中红外频率梳,实现监测弱污染物源扩散的开路测量。在 8.7 m/s 到 44.8 m/s 的范围内,以 1 s 的有效时间分辨率和 1.97 m/s 的测量不确定度在 0.1 s 的范围内展示了流速测量的测量不确定度低至每秒亚米级。利用覆盖大气传输窗口的宽带中红外频率梳,实现弱污染物源扩散监测的开路测量。在 8.7 m/s 到 44.8 m/s 的范围内,以 1 s 的有效时间分辨率和 1.97 m/s 的测量不确定度在 0.1 s 的范围内展示了流速测量的测量不确定度低至每秒亚米级。利用覆盖大气传输窗口的宽带中红外频率梳,实现监测弱污染物源扩散的开路测量。
更新日期:2020-11-23
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