Miniaturization of Digital Holographic Optical System for Displacement and Strain Measurement Using Multiple Imaging Device

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Efficient strain measurement technique is required to inspect defects in the infrastructure. Phase-shifting digital holography is a convenient method to measure displacement and strain distributions. To simplify the optical setup is required for producing more compact equipment for practical use. Authors proposed a method to measure displacement and strain using multiple imaging devices. An optical setup using five imaging devices was developed. A simple phase-shifting optical setup to provide reference wave to each imaging device using a spherical wave was proposed. The effectiveness of this proposed method was confirmed.