摘要
目前为了高精度地测量材料表面形变、应变场,正致力于完善在试件表面刻蚀1,000-10,000线/mm的正交网络技术,这是件难度很大的具有一定限度的新技术,当刻线比线距宽时,由于使用效果不佳而失去意义。本文避免了在试件表面制作这种高密集刻线的困难,用了在试件表面制作10-100线/mm表面光栅的新方法,把栅距d及其变化量Δd的测量、转换、放大成为衍射光斑间距L及其变化量ΔL的测量,再经光信息采集,与数据处理的硬件、软件系统,把mm量级形变的测量提高到μm量级的测量精度,发展了高精度(微米量级)、快速(微秒量级)、自动地获得与处理表面形变、应变场等表面特征量的新途径。
Taking circular symmetric Gaussian beam changing into cross beam as an example,the designing theory and method of Hologram Optics Element(HOE) are put forward in the paper.The diffraction equation of Computer Generated Holograms(CGH) is deduced.The method of imitating the designing result with computer is given.The problems of beam energy converting efficieny and the energy redistribution can be solved by use of HOE.The advantages of nimbleness and convenience are fully used by the method.The blindness in designing is utmostly reduced and the designing efficiency has been raised.
出处
《光电工程》
CAS
CSCD
1997年第3期33-36,共4页
Opto-Electronic Engineering
基金
国家自然科学基金
航空科学基金
关键词
变形测量
应变测量
材料缺陷
表面缺陷
光电测量
Holographic optical elements,Computer generated holograms,Transverse modes,light diffraction,Phase gratings.