The design and analysis of DOEs for Variable Intensity spot-array generation systems

• Main Authors: Hsiang-cheng Tseng., 曾祥城
• Other Authors: yibin Lu.
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/47001323654137547969

碩士 === 中正理工學院 === 電機工程研究所 === 86 === ABSTRACT The diffraction optical elements(DOEs) based on basic diffraction theorem have the advantages of small size, light weight, flexibility, and ease of duplication, they can reduce the space of the interconnection system and provide the possibility of mass production. The purpose of this thesis is to design the DOEs for generating variable intensity spots. In this thesis, we introduce the principle and the technology of both the Iterative Fourier Transform algorithm (IFT) and the Iterative Discrete On-axis encoding methord (IDO), also explore the difference between them. In order to improve the uniformity and the control of target spots intensity, we use the temperature relaxation method and the weighting method and design the grating with software program. In our work, efficiency, dynamic range and signal-to-noise ratio are used as the standard to judge the generated results from different design algorithms. Finally, we propose a modified design procedure based on IDO method, the simulation shows that it works well. Here, we use the MATLAB software to simulate and design the DOEs for variable intensity spot-array generation systems. After calculating, the 2-D, 3-D sports image generated from the DOEs and quantized phase pattern of the DOEs are displayed.