Multiplication sampling moire method for full-field deformation measurement of composite materials

A multiplication sampling moire (MSM) method was proposed for robust deformation distribution measurement by performing phase analysis of the second harmonic (second-order frequency) of a single grating pattern. The MSM method has a very strong noise immunity because the second harmonic spectrum is...

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Veröffentlicht in:Optics letters 2022-01, Vol.47 (1), p.70-73
Hauptverfasser: Wang, Qinghua, Ri, Shien, Mohammad Fikry, M J, Ogihara, Shinji
Format: Artikel
Sprache:eng
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Zusammenfassung:A multiplication sampling moire (MSM) method was proposed for robust deformation distribution measurement by performing phase analysis of the second harmonic (second-order frequency) of a single grating pattern. The MSM method has a very strong noise immunity because the second harmonic spectrum is far from the low-frequency region of the background noise in the frequency domain. Phase analysis of an experimental grid image on a carbon fiber-reinforced plastic (CFRP) specimen indicated that the MSM method effectively solved the problem of non-negligible phase measurement errors of conventional methods that extract the fundamental frequency of the grating, in the case of severe local noise. The displacement and strain distributions of CFRP in a tensile test were successfully measured. This method is suitable for deformation measurement of various composite materials.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.445854