Temat: Fourier transform profilometry

Skocz do pozycji: 1.

Tytuł:: A method for probing the refractive index change in photorefractive crystals
Autorzy:: Fu, M.
Gao, C.
Wang, X.
Cui, Y.
Dai, S
Tematy:: Fourier transform profilometry
refractive index change
photorefractive effect; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174913.pdf Link otwiera się w nowym oknie
Opis:: A method for probing refractive index changes in photorefractive crystals using an interferometric technique and digital image processing was proposed. Based on equal thickness interference in LiNbO3 crystal and Fourier transform profilometry, we obtained phase value changes in interferograms induced by a photorefractive effect, and further calculated refractive index changes. The maximal values for extraordinary light (e-light) and ordinary light (o-light) are 6.6×10–4 and 1.2×10–4, respectively.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Examining the surface of the polyamide nanocomposite using optical profilometry
Autorzy:: Majka, M.
Majka, T. M.
Tematy:: polyamide nanocomposite
montmorillonite
optical profilometry
Fourier transform image; Pokaż więcej
Wydawca:: Tomasz Mariusz Majka
Powiązania:: https://bibliotekanauki.pl/articles/134899.pdf Link otwiera się w nowym oknie
Opis:: In this paper the results of neat polyamide 6 (PA6), processed matrix and polyamide 6 reinforced with montmorillonite 3 wt% (PA6/MMT), surface examination are presented. Examination of surface of the samples was performed using optical profilometry, which allows to measure their physical properties in non-invasive method. Based on the analysis of the radiation intensity of the reflected light from the surface the Fourier Transform was performed, to allow the analysis of images obtained in the frequency domain.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 3.

Tytuł:: Improved method for phase wraps reduction in profilometry
Autorzy:: Du, G.
Wang, M.
Zhou, C.
Si, S.
Li, H.
Lei, Z.
Li, Y.
Tematy:: phase unwrapping
zero-padding
Fourier transform
carrier-frequency
profilometry; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/173793.pdf Link otwiera się w nowym oknie
Opis:: In order to completely eliminate, or greatly reduce the number of phase wraps in 2D wrapped phase map, Gdeisat and co-workers proposed an algorithm, which uses shifting the spectrum towards the origin. But the spectrum can be shifted only by an integer number, meaning that the phase wraps reduction is often not optimal. In addition, Gdeisat’s method will take much time to make the Fourier transform, inverse Fourier transform, select and shift the spectral components. In view of the above problems, we proposed an improved method for phase wraps elimination or reduction. First, the wrapped phase map is padded with zeros, the carrier frequency of the projected fringe is determined by high resolution, which can be used as the moving distance of the spectrum. And then realize frequency shift in spatial domain. So it not only can enable the spectrum to be shifted by a rational number when the carrier frequency is not an integer number, but also reduce the execution time. Finally, the experimental results demonstrated that the proposed method is feasible.
Dostawca treści:: Biblioteka Nauki

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