Abstract
Digital holography is an active research topic. It is a novel holography technique which is based on conventional holography and synthesizes electronics technique, computer technique and image processing techniques. In digital holography, charge coupled device CCD substitutes common recording material to record hologram and computer simulation replaces optical diffraction to optical diffraction digitally reconstruct recorded object field. The digital holography can be conveniently treated in mathematics. It has short exposure time, no chemical developing and fixing processing, and therefore it can perform real-time acquirement and processing of images. Digital holography has been widely applied in many fields such as appearance measurement、distortion measurement、vibration measurement、component defect measurement、optical fiber、micro-electronics and biologic cell, and it has more important meaning.
In this thesis, the recording and reconstruction of digital holograms have been studied both theoretically and experimentally. Firstly, it introduces the principles of digital holography, three kinds of reconstruction algorithms (Fresnel integral, convolution and Phase Shift Method) of digital hologram are deduced. Numerical algorithms have been programmed according to the representations of the discrete mathematics. By using numerical reconstruction method the object images are obtained successfully, It is testified that there is huge potential the metrological applications using digital holography in microstructure measurement.
