用双图全息相移干涉法计算与时间有关的位相分布

Phase Distribution Evaluation of Time Dependent Holographic Fringe Pattern by Dual Fringe Patterns Phase Shifting Interferometry

提出一种双图全息相移干涉法．该方法可以用来计算与时间有关的位相分布，两幅全息干涉条纹图可以同时得到，并且有固定的９０°位相差．虽然两幅条纹图的位相可以随着时间变化，如环境影响，或载荷变化，但他们之间的位相差恒定．该方法利用二维傅氏变换，结合偏振相移法以及分光技术．

This peper presents how a new and simple technique refered as to Dual Fringe Patterns Phase Shifting Interferometry to be used in holography interferometry for automated phase evaluation of time dependent problem. The novel feature of the technique is that two fringe patterns with exactly desired phase shift can be obtained simultaneousely. Although, the phase distribution of the two fringe patterns could vary with respect to time due to the effect of environmental disturbance, the phase shift between them is fixed. The technique is based on the combination of spliting fringe pattern, polarization phase shifting and two dimensional digital FFT schemes.