Thermal Boundary Layer Effects on Line-of-Sight Tunable Diode Laser Absorption Spectroscopy (TDLAS) Gas Concentration Measurements
Thermal Boundary Layer Effects on Line-of-Sight Tunable Diode Laser Absorption Spectroscopy (TDLAS) Gas Concentration Measurements
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DOI：
10.1177/0003702817752112
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发表时间：
2018-06-01
影响因子：
3.5
通讯作者：
Ebert, Volker
中科院分区：
文献类型：
--
作者：
Qu, Zhechao;Werhahn, Olav;Ebert, Volker
在具有空间温度梯度的条件下使用视线（LOS）TDLAS时，必须量化热边界层对可调谐二极管激光吸收光谱（TDLAS）测量结果的影响。本文提出了一种新的方法，光谱模拟的基础上量化的LOS TDLAS测量偏差的条件下，热边界层。不同的温度梯度和热边界层厚度的光谱碰撞宽度和气体浓度测量的影响进行了量化。采用双气室产生空间温度梯度的CO2 TDLAS光谱仪对模拟结果进行了验证。在不同温度梯度条件下，测量的偏差和LOS平均碰撞宽度与模拟结果非常一致。我们证明了量化的热边界层的厚度与所提出的方法，通过开发的LOS平均的碰撞宽度的路径集成的频谱。
The effects of thermal boundary layers on tunable diode laser absorption spectroscopy (TDLAS) measurement results must be quantified when using the line-of-sight (LOS) TDLAS under conditions with spatial temperature gradient. In this paper, a new methodology based on spectral simulation is presented quantifying the LOS TDLAS measurement deviation under conditions with thermal boundary layers. The effects of different temperature gradients and thermal boundary layer thickness on spectral collisional widths and gas concentration measurements are quantified. A CO2 TDLAS spectrometer, which has two gas cells to generate the spatial temperature gradients, was employed to validate the simulation results. The measured deviations and LOS averaged collisional widths are in very good agreement with the simulated results for conditions with different temperature gradients. We demonstrate quantification of thermal boundary layers' thickness with proposed method by exploitation of the LOS averaged the collisional width of the path-integrated spectrum.