论文标题
空气的瑞利 - 布里林光散射光谱；实验，预测模型和无量纲缩放
Rayleigh-Brillouin light scattering spectroscopy of air; experiment, predictive model and dimensionless scaling
论文作者
论文摘要
在空气中已经在空气中进行了0.25-3 bar和273-333 K范围内的温度范围内的压力。RB -Spectral曲线的功能行为是实验参数的函数，例如入射波长，散射角度，压力和温度依赖性，以及对热量的依赖性，以及相关的依赖性，以及相关的依赖性，以及依赖性的依赖性，在空气中进行了自发的雷利奶油散射（RB）实验。粘度，导热率，内部热容量和大量粘度。测量在散射几何形状以散射角度$θ= 55.7^\电路$和$λ_I= 532.22 $ nm的入射波长中进行，在该波长上，Brillouin特征在其上比在正确的角度几何形状和紫外线更为明显。对于1-3 bar的压力条件，将以高信噪比测量的Rb-spectra与提取了空气块粘度的Tenti-S6模型计算和值进行比较。发现$η_b$的值在$ 1.0-2.0 \ times 10^{ - 5} $ pa $ \ cdot $ s的范围内表现出对温度的线性依赖性。从一个实验集合中推导了温度相关的值以产生：$η_{\ rm b} =（0.86 \ times 10^{ - 5}） + 1.29 \ times 10^{ - 7} \ cdot（t-250）$。这些结果是在模型计算中实现的，这些计算已通过与地球大气相关的低压条件（$ p <1 $ bar）进行了验证。结果，我们证明，可以通过Tenti-S6模型在给定的气相和检测条件（$ p $，$ t $，$λ_i$和$θ$）中生成空气中空气的RB散射光谱曲线，以及用于加油传输系数的值。
Spontaneous Rayleigh-Brillouin scattering (RBS) experiments have been performed in air for pressures in the range 0.25 - 3 bar and temperatures in the range 273 - 333 K. The functional behaviour of the RB-spectral profile as a function of experimental parameters, such as the incident wavelength, scattering angle, pressure and temperature is analyzed, as well as the dependence on thermodynamic properties of the gas, as the shear viscosity, the thermal conductivity, the internal heat capacity and the bulk viscosity. Measurements are performed in a scattering geometry detecting at a scattering angle $θ=55.7^\circ$ and an incident wavelength of $λ_i=532.22$ nm, at which the Brillouin features become more pronounced than in a right angles geometry and for ultraviolet light. For pressure conditions of 1 - 3 bar the RB-spectra, measured at high signal-to-noise ratio, are compared to Tenti-S6 model calculations and values for the bulk viscosity of air are extracted. Values of $η_b$ are found to exhibit a linear dependence on temperature over the measurement interval in the range $1.0 - 2.0 \times 10^{-5}$ Pa$\cdot$s. A temperature dependent value is deduced from a collection of experiments to yield: $η_{\rm b} = (0.86 \times 10^{-5}) + 1.29 \times 10^{-7} \cdot (T - 250)$. These results are implemented in model calculations that were verified for the low pressure conditions ($p < 1$ bar) relevant for the Earth's atmosphere. As a result we demonstrate that the RB-scattering spectral profiles for air under sub-atmospheric conditions can be generated via the Tenti-S6 model, for given gas-phase and detection conditions ($p$, $T$, $λ_i$, and $θ$), and for values for the gas transport coefficients.
