Real - Time Spatial Light Modulated Digital Holographic Interferometry Applied in Art Structural Diagnosis (original) (raw)

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 2018

Abstract

In this paper we apply digital holographic interferometry as a structural diagnosis tool to investigate some surface defects in a XIXth century wooden icon. We use a fully digital experimental set-up for real time acquisition and digital optical reconstruction of holographic sequences. The light source is a He-Ne laser, the digital recording component consists of a CCD camera and a spatial light modulator (SLM) works as a digital holographic projector for the optical reconstruction of the interferograms. Both the acquisition set-up and the reconstruction one are functioning simultaneously therefore the changes in the surface structure are visualized in real-time like a digital holographic interferometry “fringe motion picture” with a 20 fps display. Detachment defects of the paint layer are identified using this non-destructive method and the real-time feature has proven to be useful because it gave a very useful dynamicity to the entire investigation process.

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