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Statistical processing of Newton’s rings using discrete Fourier analysis

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Nascov V, Apostol D, Garoi F

Editorial: OPTICAL ENGINEERING , 46 (2), p.028201, 2007.


We present a practical numerical method for processing the
fringes obtained when two waves, with a quadratic phase difference
function, interfere. This kind of fringe includes straight equispaced
fringes and Newton’s rings as particular cases. The numerical method
we present is based on the discrete Fresnel Fourier transform of the
data and has the same precision as least square fitting LSF. Compared
to the LSF method, this new method is better, as it is more efficient and
does not require initial approximations for the fringe parameters to be

Cuvinte cheie: interferometry; interference fringes; least square fitting; discrete Fourier transform