Interferogram Simulation Zernike polynomials are the quantized wave-front aberrations. Computationally producing zernike polynomials and using them to simulate an interferogram has been achieved. FFT methods and Phase shifting techniques were used to analyze the fringe pattern to obtain phase information. The phase so obtained is indeterminate to a factor of 2π. In most cases, a computer-generated function subroutine gives a principal value ranging from −π to π. An offset of phase has to be added to the discontinuous phase distribution to obtain the continuous phase map. This refers to the PHASE UNWRAPPING PROBLEM. FFT Analysis Phase Shifting Interferometry Wrapped Wavefront Phase Unwrapped Phase Map Phase Unwrapping of an Interferogram B.Santosh Kumar Department of Physics Sri Sathya Sai Institute Of Higher Learning Zernike polynomials simulation (ρ,θ)= || () cos m; for m > 0 • - || () sin m; for m < 0 (ρ)= (−1 )(n − s)! s!*0.5(n + |m|) − s+!*0.5(n − |m|) − s+! (−||)/2 =0 = 2(+1) 1+ δ is the Kronecker delta (= 1 for m = 0, 0 for m≠0). g(x, y) = a(x, y) + b(x, y) cos[2 x + φ(x, y)] φ(x, y) = − − −