用于流体表面轮廓测量的复用数字全息术
Multiplexed digital holography for fluid surface profilometry
AI总结：
本研究针对数字全息术在流体轮廓测量中应用不足的问题，提出基于DH反射测量法的复用方案，通过分离空间频域干涉图重建流体表面，可追踪波浪演化、表层蒸发等动态变化，拓展了数字全息术的应用场景。
摘要：
数字全息术（Digital Holography, DH）已被广泛应用于材料科学与生物学领域的微纳结构成像与表征，同时也具备对流体表面开展高分辨率、非破坏性测量的潜力。数字全息装置可捕获经物体散射或从表面反射的光的复杂波前，从而对其形状和形变进行定量测量。然而，该技术在流体轮廓测量中的应用较少，也尚未得到深入探究。我们提出了一种DH装置的替代用法，可用于测量和监测流体样本的表面。基于DH反射测量法，我们的建模表明，来自样本和参考面的多次反射会发生干涉，并生成样本的多幅全息图，最终形成波前的复用图像。各幅干涉图可在空间频域中被分离出来，进而可从中对流体表面进行数字重建。我们进一步证明，该装置可用于追踪流体表面随时间的变化，例如在波浪形成与传播或表层蒸发过程中的表面变化。
英文摘要：
Digital holography (DH) has been widely used for imaging and characterization of micro and nanostructures in materials science and biology and has the potential to provide high-resolution, non-destructive measurements of fluid surfaces as well. Digital holographic setups capture the complex wavefronts of light scattered by an object or reflected from a surface, allowing for quantitative measurements of their shape and deformation. However, their use in fluid profilometry is scarce and has not been explored in much depth. We present an alternative usage for a DH setup that can measure and monitor the surface of fluid samples. Based on DH reflectometry, our modelling shows that multiple reflections from the sample and the reference interfere and generate multiple holograms of the sample, resulting in a multiplexed image of the wavefront. The individual interferograms can be isolated in the spatial-frequency domain, and the fluid surface can be digitally reconstructed from them. We further show that this setup can be used to track changes in the surface of a fluid over time, such as during the formation and propagation of waves or evaporation of surface layers.
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