A New Optical Surface Measurement Method with Iterative Sparsity-Constrained Threshold Phase Retrieval Algorithm

作者：Niu, Yi^*; Liu, Yang; Shi, Guangming; Gao, Dahua; Li, Guo

来源：The Scientific World Journal, 2014, 2014: 548395.

DOI：10.1155/2014/548395

• SPATIAL LIGHT-MODULATOR
• IMAGE
• RECONSTRUCTION
• DOMAIN

Due to its low complexity and acceptable accuracy, phase retrieval technique has been proposed as an alternative to solve the classic optical surface measurement task. However, to capture the overall wave field, phase retrieval based optical surface measurement (PROSM) system has to moderate the CCD position during the multiple-sampling procedure. The mechanical modules of CCD movement may bring about unexpectable deviation to the final results. To overcome this drawback, we propose a new PROSM method based on spatial light modulator (SLM). The mechanical CCD movement can be replaced by an electrical moderation of SLM patterns; thus the deviation can be significantly suppressed in the new PROSM method. In addition, to further improve the performance, we propose a new iterative threshold phase retrieval algorithm with sparsity-constraint to effectively reconstruct the phase of wave field. Experimental results show that the new method provides a more simple and robust solution for the optical surface measurement than the traditional techniques and achieves higher accuracy.

• 出版日期2014
• 单位中国人民解放军空军工程大学; 西安电子科技大学