Author Affiliations
Abstract
1 State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China
2 Engineering and Surface Metrology Laboratory, National Institute of Standards, Tersa St., El haram, El Giza, Egypt
3 Division of Mechanical System Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea
We present a Fizeau interferometer using a microscopic objective as a tool for surface contouring without the need for a numerical lens for reconstruction. The interferometer is associated with a telescope system to feature the object with collimated light. The experiment is conducted on two objects possessing different step heights. The phase maps from the captured off-axis holograms are calculated numerically, which allows us to deduce the contours of the objects. The great advantages of the presented technique are that it can be done in real time and there is no need for numerical lenses for micro-objects reconstruction.
070.6110 Spatial filtering 100.5090 Phase-only filters 170.0180 Microscopy 180.0180 Microscopy Chinese Optics Letters
2015, 13(10): 100701
军械工程学院光学与电子工程系, 河北石家庄050003
为了使在空间光调制器上易于实现的三元相位振幅滤波器在畸变容限、噪声抑制能力和相关峰尖锐度这3个指标上均能取得较好的性能，在最优折衷最大相关高度滤波器的基础上提出了最优折衷三元相位振幅滤波器，并研究了其设计方法。它只需最大化单个准则就能确定最优的临界线角度和支撑区域，简化了优化设计过程。实验结果表明：与二元纯相位滤波器相比，这种滤波器对于在30°的旋转畸变范围内并存在复杂背景的目标能给出更尖锐的相关峰。这将提高相关峰探测的准确性。
信息光学 光学相关识别 空间光调制器 二元纯相位滤波器 三元相位振幅滤波器 information optics optical correlation recognition spatial light modulators binary phase-only filters ternary phase-amplitude filters
1 天津大学精仪学院, 天津 300072
2 Depattment of Electrical Engineering, University of Lousville, Louisville, Kentucky 40292, USA
阐述了纯相位型空间光滤波器的设计中伪随机编码理论、技术与方法。文中亦展示了利用控制待编码的复数值函数的振幅能够十分有效地改善远场衍射的质量。
纯相位型滤波器 伪随机编码 远场衍射
