Broadband dual-frequency comb spectroscopy in a rapid compression machine
Broadband dual-frequency comb spectroscopy in a rapid compression machine
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DOI：
10.1364/oe.27.010814
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发表时间：
2019-04-15
期刊：
影响因子：
3.8
通讯作者：
Rieker, Gregory B.
中科院分区：
文献类型：
--
作者：
Draper, Anthony D.;Cole, Ryan K.;Rieker, Gregory B.
我们展示了光纤锁模双频梳状光谱，可在快速压缩机 (RCM) 中进行宽带高分辨率测量。我们应用变迹技术来提高短期信噪比（SNR），从而能够在与燃烧相关的时间尺度上进行宽带光谱分析。我们在 CH4-N-2 混合物的 12 ms 压缩过程中以 704 μs 时间分辨率测量了 5967 至 6133 cm(-1) 之间 24345 个单独波长元件（梳齿）的吸收。我们讨论了变迹技术对吸收光谱的影响，并在拟合过程中对光谱模型应用相同的效果以恢复混合物温度。将拟合温度与绝热模型进行比较，发现与预期趋势非常一致。这项工作展示了 DCS 作为原位诊断工具的潜力，可在类似发动机的环境中进行宽带、高分辨率测量。 (C) 2019 年美国光学学会根据 OSA 开放获取出版协议条款
We demonstrate fiber mode-locked dual-frequency comb spectroscopy for broadband, high-resolution measurements in a rapid compression machine (RCM). We apply an apodization technique to improve the short-term signal-to-noise-ratio (SNR), which enables broadband spectroscopy at combustion-relevant timescales. We measure the absorption on 24345 individual wavelength elements (comb teeth) between 5967 and 6133 cm(-1) at 704 mu s time resolution during a 12 ms compression of a CH4-N-2 mixture. We discuss the effect of the apodization technique on the absorption spectra, and apply an identical effect to the spectral model during fitting to recover the mixture temperature. The fitted temperature is compared against an adiabatic model, and found to be in good agreement with expected trends. This work demonstrates the potential of DCS to be used as an in situ diagnostic tool for broadband, high-resolution measurements in engine-like environments. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement