Phase-Shifting Method with Unknown Intervals in Phase-Shifting Digital Holography
Phase-Shifting Method with Unknown Intervals in Phase-Shifting Digital Holography
复制标题
相移数字全息中未知间隔的相移方法
DOI：
10.4028/www.scientific.net/amm.3-4.211
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
T. Matui
中科院分区：
文献类型：
--
作者：
T. Kita;Y. Morimoto;M. Fujigaki;T. Matui
采用移相法可以进行高精度的位移测量。在移相法中，通常采用四步移相一个周期。在传统的干涉法中，用干涉仪测量物体的位移，在四步相移中，参考光的相位每移π/2。本文提出了一种区间未知的相移方法。这种方法不需要每π/2移动一个相位。即使相移量未知，它也可以从具有相等间隔的五个条纹图像检测强度分布和相位分布。利用这种方法，我们提出了一种以球面波为参考波的相移数字全息干涉位移测量方法。
Displacement measurement can be performed with high accuracy using phase-shifting method. In phase-shifting method, it is often used four steps of phase-shifting for one cycle. In conventional method, to measure the displacement of an object by an interferometer, the phase of a reference beam should be shifted by every π/2 in the four-step phase-shifting. In this paper, a phase-shifting method with unknown intervals is proposed. This method does not need to shift a phase by every π/2. It can detect an intensity distribution and a phase distribution from five fringe images with equal intervals even if the phase-shift amount is unknown. Using this method, we propose a displacement measurement of phase-shifting digital holographic interferometry using spherical wave as reference wave.