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Sensing three-dimensional index-of-refraction variations by means of optical wavefront sensor measurements and tomographic reconstruction

机译：通过光学波前传感器测量和断层成像重建来感测三维折射率变化

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摘要

Light waves propagating through a region of inhomogeneous index of refraction are aberrated. Turbulent air flows cause such inhom-ogeneities to arise from density fluctuations within the flow, which affect the index of refraction of air. Here we describe a technique for measuring the 3-D structure of the index-of-refraction'distribution in a turbulent air flow using optical wavefront sensor measurements and tomographic signal reconstruction. Use of wavefront sensor measurements offers higher-speed measurement than previously used holographic methods, while providing high-fidelity reconstructions. We discuss Hartmann sensor measurements and wavefront reconstruction. Sampling requirements are also addressed, including the effects of a limited number of projections and wavefront subaperture size. Theory, simulation, and experimental results are presented.
机译：穿过不均匀折射率区域传播的光波被畸变。湍流气流导致这种不均匀性是由气流中的密度波动引起的，从而影响了空气的折射率。在这里，我们描述了一种使用光学波前传感器测量和层析成像信号重建技术来测量湍流气流中折射率分布的3-D结构的技术。波前传感器测量的使用提供了比以前使用的全息方法更高的速度，同时提供了高保真度重建。我们讨论了Hartmann传感器的测量和波前重建。还解决了采样要求，包括有限数量的投影和波前子孔径的影响。介绍了理论，仿真和实验结果。

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