Wavefront shaping for imaging-based flow velocity measurements through distortions using a Fresnel guide star
Wavefront shaping for imaging-based flow velocity measurements through distortions using a Fresnel guide star
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DOI：
10.1364/oe.24.022074
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发表时间：
2016-09-19
期刊：
影响因子：
3.8
通讯作者：
Czarske, Juergen W.
中科院分区：
文献类型：
--
作者：
Koukourakis, Nektarios;Fregin, Bob;Czarske, Juergen W.
基于成像的流量测量技术，例如粒子图像测速 (PIV)，很容易受到时变失真的影响，例如折射率不均匀性或波动的相界。这种扭曲极大地增加了速度误差，因为示踪粒子的位置分配和图像对比度的降低表现出显着的不确定性。我们证明基于空间分布导星的波前整形有可能显着降低测量不确定性。概念验证实验表明，性能提升了一个数量级以上。波前整形 PIV 的可能应用范围从射流和薄膜流测量到生物医学应用。 (C) 2016年美国光学学会
Imaging-based flow measurement techniques, like particle image velocimetry (PIV), are vulnerable to time-varying distortions like refractive index inhomogeneities or fluctuating phase boundaries. Such distortions strongly increase the velocity error, as the position assignment of the tracer particles and the decrease of image contrast exhibit significant uncertainties. We demonstrate that wavefront shaping based on spatially distributed guide stars has the potential to significantly reduce the measurement uncertainty. Proof of concept experiments show an improvement by more than one order of magnitude. Possible applications for the wavefront shaping PIV range from measurements in jets and film flows to biomedical applications. (C) 2016 Optical Society of America