线性加权物体振幅和相位的数字全息焦平面定位研究  

Focal Plane Determination Based on Linear Weighting of Amplitude and Phase in Digital Holography

作　　者：杨鸿[1] 陈鹤鹏 刘海[1] 李扬[1] 徐国庆[1] 杨岩[1] 

机构地区：[1]重庆理工大学机械工程学院,重庆400054 [2]韩国全南大学机械工程学院

出　　处：《激光与光电子学进展》2016年第1期84-91,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(11272368)

摘　　要：将物体波前中的振幅信息与相位信息同时作为焦平面判定准则,物体波前中含有振幅信息和相位信息,而强度是振幅的表现形式,较容易获得,因此目前主要提取物体波前的振幅信息来定位焦平面。采用相关系数(CC)法提出并验证了利用物体的振幅信息判定焦平面。分析相位信息将运用于相关系数法中,获得CC曲线峰值确定焦平面距离。分析得到同一物体的振幅CC曲线和相位CC曲线峰值所确定的焦平面距离有差距的原因是因为物体波前振幅和相位信息的区别。运用线性加权法,将物体的振幅CC曲线和相位CC曲线峰值所确定的焦平面距离加权来确定物体的焦平面。运用一系列实验验证了该焦平面方法的可行性和有效性。A new refocusing criterion taking advantage of both intensity and phase information of object wave front is applied to detect a focal plane. The wavefront of object includes amplitude and phase information and amplitude information is mainly employed to locate the focal plane on account of intensity of holograms is on behalf of amplitude and easy to obtain. The study of the correlation coefficient （CC） method on intensity has been proved. Phase information is analyzed and employed in CC method and focusing distance obtained from the peak of CC curve. The difference between the two focal distance obtained by phase information and amplitude information is due to that there is a difference on amplitude and phase of wave front. The two distance obtained from CC curve of amplitude and phase is weighted based on linear weighting and a final focal plane is positioned. Experiments validate that it works effectively.

关 键 词：全息 数字全息 焦平面 线性加权 相位 

分 类 号：O436[机械工程—光学工程]