Phase imaging based on modified transport of intensity equation using liquid crystal variable retarder with partial coherent illumination
Phase imaging based on modified transport of intensity equation using liquid crystal variable retarder with partial coherent illumination
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DOI：
10.1007/s10043-020-00576-x
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发表时间：
2020-01
期刊：
影响因子：
1.2
通讯作者：
A. Gupta;A. Fatima;N. Nishchal;T. Nomura
中科院分区：
文献类型：
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作者：
A. Gupta;A. Fatima;N. Nishchal;T. Nomura
在本文中，我们展示了一种基于改进的强度输运方程（TIE）的非干涉相位成像技术，该技术通过液晶可变缓速器（LCVR）和部分相干照明。LCVR已用于纯移相器配置，以产生折射率变化。改进后的TIE无需相机或物体的机械位移，只需要记录两张不同折射率的强度图像。采用发光二极管（LED）作为光源，避免了相干成像中常见的散斑问题。虽然LCVR是一种多功能装置，但其在相回收方面的应用研究较少。通过对USAF分辨率图、紫外滴胶、微透镜和洋葱皮的成像，证明了该方法的适用性。洋葱皮的结果也与商用的明场显微镜进行了比较。
In this paper, we demonstrate a non-interferometric phase imaging technique based on modified transport of intensity equation (TIE) through a liquid crystal variable retarder (LCVR) and partial coherent illumination. The LCVR has been used in pure phase shifter configuration for creating refractive index variation. The modified TIE eliminates the need of mechanical displacement of camera or object, since it needs recording of only two intensity images with different refractive indices. A light-emitting diode (LED) has been used as a light source to avoid the usual speckle problems in coherent imaging. Although LCVR is a versatile device, its application towards phase recovery is less studied. The applicability of the method has been demonstrated through imaging a USAF resolution chart, ultra-violet glue drop, micro-lens, and onion’s peel. The result of onion’s peel has also been compared with a commercial bright-field microscope.