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Calibrated Phase-Shifting Digital Holographic Microscope Using a Sampling Moiré Technique

Research Institute for Measurement and Analytical Instrumentation, National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Appl. Sci. 2018, 8(5), 706; https://doi.org/10.3390/app8050706
Received: 31 March 2018 / Revised: 18 April 2018 / Accepted: 27 April 2018 / Published: 3 May 2018
(This article belongs to the Special Issue Applications of Digital Holographic Microscopy)
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Abstract

A calibrated phase-shifting digital holographic microscope system capable of improving the quality of reconstructed images is proposed. Phase-shifting errors are introduced in phase-shifted holograms for numerous reasons, such as the non-linearity of piezoelectric transducers (PZTs), wavelength fluctuations in lasers, and environmental disturbances, leading to poor-quality reconstructions. In our system, in addition to the camera used to record object information, an extra camera is used to record interferograms, which are used to analyze phase-shifting errors using a sampling Moiré technique. The quality of the reconstructed object images can be improved by the phase-shifting error compensation algorithm. Both the numerical simulation and experiment demonstrate the effectiveness of the proposed system. View Full-Text
Keywords: digital holography; microscope; phase-shifting; Moiré technique digital holography; microscope; phase-shifting; Moiré technique
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Xia, P.; Wang, Q.; Ri, S.; Tsuda, H. Calibrated Phase-Shifting Digital Holographic Microscope Using a Sampling Moiré Technique. Appl. Sci. 2018, 8, 706.

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