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Evaluation of thermal lens fringes using hilbert and fourier transform methods

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4 Author(s)
Saraç, Z. ; Dept. of Electr. & Electron. Eng., Zonguldak Karaelmas Univ., Zonguldak, Turkey ; Birkök, H.G. ; Taşķn, H. ; Öztürk, E.

This study presents the analysis of thermal lens fringes obtained by heating the Nile-blue/ethanol solution with a He-Cd laser in a Michelson interferometer by utilising the Hilbert transform method (HTM) and the Fourier transform method (FTM) with a Gaussian filter. HTM and FTM are used for obtaining local phase and refractive index change maps of the interferograms. The results reveal that HTM creates harmonics in the frequency spectrum; hence, the signal cannot be filtered very accurately, whereas FTM with a Gaussian filter can create a smooth filtering effect.

Published in:

Science, Measurement & Technology, IET  (Volume:5 ,  Issue: 3 )