Strain estimation in digital holographic interferometry using piecewise polynomial phase approximation based method

Sai S. Gorthi, G. Rajshekhar, Pramod Rastogi
2010 Optics Express  
Measurement of strain is an important application of digital holographic interferometry. As strain relates to the displacement derivative, it depends on the derivative of the interference phase corresponding to the reconstructed interference field. The paper proposes an elegant method for direct measurement of unwrapped phase derivative. The proposed method relies on approximating the interference phase as a piecewise cubic polynomial and subsequently evaluating the polynomial coefficients
more » ... l coefficients using cubic phase function algorithm. The phase derivative is constructed using the evaluated polynomial coefficients. The method's performance is demonstrated using simulation and experimental results.
doi:10.1364/oe.18.000560 pmid:20173875 fatcat:n5rxbjujybg3rbmthdbh6s2wfi