基于双窗口载波干涉的动态相位测量研究

Dynamic phase measurement using two-window carrier interferometer

研究了一种具有共光路结构的双窗口载波干涉方法用于动态相位测量。基于4 f光学成像系统,将输入面分成两个窗口,并在成像透镜之间放置郎奇光栅,通过控制光栅的离焦引入载波,进而利用傅里叶变换法实时定量恢复待测物的相位分布。构建了实验平台,并实时记录了水滴的蒸发过程和有机玻璃板的受压迫变形过程。结果表明,本文方法不仅结构简单、抗干扰性能好,而且实时性好,适合于动态相位变化的实时测量。

A common-path two-window carrier interferometer is provided for applications of dynamic quantitative phase measurements. This interferometer is built on a 4f optical system with two apertures formed in the input plane, a ronchi grating is located between two lenses, and the spatial carrier is intro- duced by the defocus of the grating. Then,a quantitative phase distribution of the specimen can be re- trieved using the Fourier transform method. By giving the phase retrieval model of the interferometer and building an experimental setup, an evaporative water drop and a PMMA board under stress are recorded using this interferometer. The experimental results show that this interferometer not only has simple setup and good anti-interference performance, but also has good real-time ability, which makes it suitable for dynamic quantitative phase measurements.