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首页> 外文会议>AIAA aerospace sciences meeting;AIAA SciTech forum >Femtosecond laser tagging in 1,1,1,2-Tetrafluoroethane with trace quantities of air
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Femtosecond laser tagging in 1,1,1,2-Tetrafluoroethane with trace quantities of air

机译：飞秒激光标记1,1,1,2-四氟乙烷中的痕量空气

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Femtosecond laser tagging is demonstrated for the first time in R134a gas, and in mixtures of R134a with small quantities of air. A systematic study of this tagging method is explored through the adjustment of gas pressure, mixture ratio and laser properties. It is found that the signal strength and lifetime are greatest at low pressures for excitation at both the 400 nm and 800 nm laser wavelengths. The relative intensities of two spectral peaks in the near-UV emission change as a function of gas pressure and can potentially be used for local pressure measurements. Single shot precision in pure R134a and R134a with 5% air is demonstrated at the exit of a subsonic pipe flow. The parameter space of these results are chosen to mimic conditions used in the NASA Langley Research Center's Transonic Dynamics Tunnel. The precision and signal lifetime demonstrate the feasibility of using this technique for measuring flowfields that induce airfoil flutter.
机译：飞秒激光标记首次在R134a气体中以及在R134a与少量空气的混合物中得到证明。通过调整气压，混合比和激光特性，探索了对这种标记方法的系统研究。可以发现，在低压下，在400 nm和800 nm激光波长下激发时，信号强度和寿命最大。近紫外线发射中两个光谱峰的相对强度随气压的变化而变化，可潜在地用于局部压力测量。在亚音速管道流的出口处，证明了纯R134a和R134a中含5％空气的单次喷射精度。选择这些结果的参数空间以模拟NASA兰利研究中心的跨音速动力学隧道中使用的条件。精度和信号寿命证明了使用此技术测量引起翼型颤动的流场的可行性。

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