Speckles and DIC or Checkerboards and LSA?

Michel Grediac (1) , Benoît Blaysat (1) , Frédéric Sur (2)

1 IP - Institut Pascal
2 MAGRIT - Visual Augmentation of Complex Environments

Two measurement techniques, namely DIC and LSA, are compared in this study. Both techniques consist in minimizing the optical residual. DIC performs the minimization in the real domain on speckles. LSA performs this minimization in the Fourier domain on periodic patterns such as checkerboards. It is shown here that for the same systematic error and the same spatial resolution, the noise level in displacement and strain maps is lower with LSA than with DIC.

Mots clés: Speckle optimization; Random error; LSA; DIC; Checkerboard; Bia

Domaines: Mécanique des matériaux [physics.class-ph]; Traitement du signal et de l'image [eess.SP]

Michel Grediac, Benoît Blaysat, Frédéric Sur. Speckles and DIC or Checkerboards and LSA?. SEM Annual Conference & Exposition on Experimental and Applied Mechanics, Jun 2018, Greenville, United States. pp.79-80, ⟨10.1007/978-3-319-97481-1_9⟩. ⟨hal-01896817⟩