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Uncertainty in velocity measurement based on diode-laser absorption in nonuniform flows

机译：基于非均匀流中二极管激光吸收的速度测量不确定度

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摘要

This work investigates the error caused by nonuniformities along the line-of-sight in velocity measurement using tunable diode-laser absorption spectroscopy (TDLAS). Past work has demonstrated TDLAS as an attractive diagnostic technique for measuring velocity, which is inferred from the Doppler shift of two absorption features using two crossing laser beams. However, because TDLAS is line-of-sight in nature, the obtained velocity is a spatially averaged value along the probing laser beams. As a result, nonuniformities in the flow can cause uncertainty in the velocity measurement. Therefore, it is the goal of this work to quantify the uncertainty caused by various nonuniformities typically encountered in practice, including boundary layer effects, the divergence/convergence of the flow, and the methods used to fit the Doppler shift. Systematic analyses are performed to quantify the uncertainty under various conditions, and case studies are reported to illustrate the usefulness of such analysis in interpreting experimental data obtained from a scramjet facility. We expect this work to be valuable for the design and optimization of TDLAS-based velocimetry, and also for the quantitative interpretation of the measurements.
机译：这项工作研究了使用可调谐二极管-激光吸收光谱法（TDLAS）进行速度测量时视线不均匀引起的误差。过去的工作已经证明TDLAS是一种有吸引力的测量速度的诊断技术，这可以从使用两个交叉激光束的两个吸收特征的多普勒频移推论得出。但是，由于TDLAS本质上是视线，因此所获得的速度是沿着探测激光束的空间平均值。结果，流动不均匀会导致速度测量的不确定性。因此，这项工作的目标是量化由实践中通常遇到的各种不均匀性引起的不确定性，包括边界层效应，流的发散/会聚以及用于拟合多普勒频移的方法。进行了系统分析以量化各种条件下的不确定性，并报告了案例研究以说明这种分析在解释从超燃冲压设备获得的实验数据方面的有用性。我们希望这项工作对于基于TDLAS的测速仪的设计和优化，以及对测量值的定量解释都是有价值的。

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