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9 August 2023 Simple smartphone-based artworks diagnostics by Moiré method and a diffractive optical element
Claudia Daffara, Sara Mazzocato, Tullio de Rubeis, Dario Ambrosini
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Proceedings Volume 12620, Optics for Arts, Architecture, and Archaeology (O3A) IX; 1262008 (2023) https://doi.org/10.1117/12.2675056
Event: SPIE Optical Metrology, 2023, Munich, Germany
Abstract
The moir´e method is a well-known tool in NDT; it is based on the principle of superposition of two sets of lines or gratings, which creates a moir´e pattern that can reveal surface deformations caused by underlying defects or damage. In this paper, we propose a simple artwork diagnostic using the moir´e method and a smartphone. The technique is based on coupling the acquisition of fringe patterns by the smartphone camera to an effective fringe generator. The fringe generator consists of a diffractive optical element (DOE) illuminated by a laser diode; this optical device proved to be very effective thanks to its ability to produce in a simple way grid patterns of different spatial frequencies. The smartphone camera is used to capture the grid patterns and to store them in the cloud. We demonstrate the proposed approach by giving some preliminary experimental results.
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Claudia Daffara, Sara Mazzocato, Tullio de Rubeis, and Dario Ambrosini "Simple smartphone-based artworks diagnostics by Moiré method and a diffractive optical element", Proc. SPIE 12620, Optics for Arts, Architecture, and Archaeology (O3A) IX, 1262008 (9 August 2023); https://doi.org/10.1117/12.2675056
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KEYWORDS
Diagnostics
Diffractive optical elements
Data processing
Deformation
Fringe analysis
Nondestructive evaluation
Optical gratings
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