David Grégory, Thomas Benjamin, Coillet Elodie, Miffre Alain, Rairoux Patrick
Institut Lumière Matière, CNRS UMR 5306 Université Lyon 1, 10 rue Ada Byron, 69622 Villeurbanne, France.
Opt Express. 2013 Aug 12;21(16):18624-39. doi: 10.1364/OE.21.018624.
We present the first experimental observation of exact backscattering of light by an ensemble of particles in ambient air. Our experimental set-up operates in the far-field single scattering approximation, covers the exact backscattering direction with accuracy (θ = π ± ε with ε = 3.5 × 10(-3) rad) and efficiently collects the particles backscattering radiation, while minimizing any stray light. Moreover, by using scattering matrix formalism, the observation of the particles UV-backscattering signal allowed to measure the particles depolarization of water droplets and salt particles in air, for the first time, in the exact backscattering direction. We believe this result may be useful for comparison with the existing numerical models and for remote sensing field applications in radiative transfer and climatology.
我们展示了在环境空气中由一组粒子对光进行精确反向散射的首次实验观测。我们的实验装置在远场单次散射近似下运行，精确覆盖了反向散射方向（θ = π ± ε，其中ε = 3.5 × 10⁻³ 弧度），并有效地收集了粒子的反向散射辐射，同时将杂散光降至最低。此外，通过使用散射矩阵形式，对粒子紫外反向散射信号的观测首次使得能够在精确的反向散射方向上测量空气中水滴和盐颗粒的粒子去极化。我们相信这一结果可能有助于与现有的数值模型进行比较，并用于辐射传输和气候学中的遥感领域应用。
