Yoneda Naru, Onishi Aoi, Saita Yusuke, Komuro Koshi, Nomura Takanori
Opt Express. 2021 Feb 15;29(4):4783-4801. doi: 10.1364/OE.415598.
The imaging quality of quantitative phase imaging (QPI) based on the transport of intensity equation (TIE) can be improved using a higher-order approximation for defocused intensity distributions. However, this requires mechanically scanning an image sensor or object along the optical axis, which in turn requires a precisely aligned optical setup. To overcome this problem, a computer-generated hologram (CGH) technique is introduced to TIE-based QPI. A CGH generating defocused point spread function is inserted in the Fourier plane of an object. The CGH acts as a lens and grating with various focal lengths and orientations, allowing multiple defocused intensity distributions to be simultaneously detected on an image sensor plane. The results of a numerical simulation and optical experiment demonstrated the feasibility of the proposed method.
基于强度传输方程（TIE）的定量相位成像（QPI）的成像质量可以通过对散焦强度分布使用高阶近似来提高。然而，这需要沿光轴机械扫描图像传感器或物体，这反过来又需要精确对准的光学装置。为了克服这个问题，将计算机生成全息图（CGH）技术引入基于TIE的QPI中。在物体的傅里叶平面中插入一个生成散焦点扩散函数的CGH。该CGH充当具有各种焦距和取向的透镜和光栅，使得能够在图像传感器平面上同时检测多个散焦强度分布。数值模拟和光学实验结果证明了该方法的可行性。
