A modulo pi temporal phase unwrapping theory in photoelasticity (INVITED)

Abstract eng:
In this paper, a temporal phase unwrapping theory (TPUT) was proposed to retrieve the corresponding stress value of the modulo TE isochromatic retardation to the correct stress value interval. The proposed TPUT uses three wrapped stress values at three wavelengths to determine the correct stress value by judgement conditions and the least squares method. A specimen made of PSM-l photoelastic material under tensile test was used for verifying the feasibility and availability of the proposed modulo TE TPUT.

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