LIU Mi, LIU Qiang, XU Yirui, et al. Quantification and improvement of degree of coherence of hologram fringe based on digital microscope[J]. 2020, (5): 37-40.
LIU Mi, LIU Qiang, XU Yirui, et al. Quantification and improvement of degree of coherence of hologram fringe based on digital microscope[J]. 2020, (5): 37-40. DOI: 10.13873/J.1000-9787(2020)05-0037-04.
An improved reflective off-axis image plane digital holographic micro-measurement optical structure is studied. In the configuration
the optical path difference between reference and object beams is compensated
it has advantages like compactness of structure and low-cost. Then a more reliable quantitative methods for calculating fringe visibility and degree of coherence of hologram are presented
which are more suitable for evaluating hologram quality than standard deviation. The influence of the fringe visibility of holograms on reconstructing 3 D structure surface topography is studied. Experimental results prove the effectiveness of the improved configuration on enhancing the degree of coherence.