Digital Holographic System for Three-Dimensional Microstructure Measurement

Abstract

Digital holography is a digitized holography, which is very suitable for phase imaging of microstructure object. An offaxis lensless Fourier transform digital holographic system was built and analyzed. The recording and numerical reconstruction of digital hologram was discussed. The model of phase aberration in numerical reconstruction of wavefront was presented. Experimental investigations were performed for a USAF test target. The accurate phase image was obtained by combining an automatic phase aberration compensation procedure and manual adjustment process. The lateral resolution of approaching to the theoretical limit was achieved experimentally. Also, the height profiles of the test target was obtained and given.

Research on Mining Method of Process Knowledge Based on Ontology

“…Even though these itemsets present to the transaction sets, it is certainly not good strategy support, so they can be ignored absolutely. Introducing a method of cross linker, making use of the properties of cross linker can effectively reduce the times of scanning database [4]. This greatly reduces the running time of algorithm and promote the efficiency of algorithm.…”