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.

中文翻译：

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基于相干照明的液晶可变延迟器基于强度方程修正传输的相位成像

在本文中，我们演示了一种非干涉相成像技术，该技术基于通过液晶可变延迟器（LCVR）和部分相干照明的强度方程（TIE）的修正输运。LCVR已用于纯移相器配置中，以产生折射率变化。修改后的TIE不需要照相机或物体的机械位移，因为它只需要记录两个具有不同折射率的强度图像。发光二极管（LED）已经用作光源以避免在相干成像中常见的斑点问题。尽管LCVR是一种多功能设备，但其在相恢复方面的应用还很少研究。该方法的适用性已通过对USAF分辨率表，紫外线胶滴，微透镜和洋葱皮的成像进行了演示。