This paper proposes the use of the Hilbert transform for analysis of fringe patterns, which are obtained in Michelson
Interferometer. The fringe patterns are evaluated by Continuous wavelet transform and Hilbert transform algorithms to
obtain phase map and refractive index. Continuous wavelet transform algorithm shows a better filtering effect. However
Hilbert transform algorithm gives a noisy result, since its frequency spectrum has harmonic noise. Results show that the
phase map is affected by Hilbert Filter.
This paper proposes the characterization of thermal lens by white light interferometry on the Methylene -blue/water
solution. Thermal lens effect is determined by local phase, which is obtained by analyzing the thermal lens fringes with
single sideband modulation method.
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