Wyniki wyszukiwania - BazTech

1

Accentuate of moiré in an interference pattern by defocusing

Ismanov Yusupzhan Kh., Tynyshova Tolgonay D.

Optica Applicata

|

2024

|

Vol. 54, nr 1

105--114

EN

The article considers a mathematical model of an incoherent optical system, into which defocusing is introduced as an aberration. When modeling, it is assumed that if non-coherent lighting is used to illuminate an object, then the transforming optical system should be considered as linear with respect to the intensity of the light. An analysis of the optical system of a general form was carried out, and relations were obtained for a system with a circular pupil, who allowed obtaining defocused images at the output of the optical system, and the defocusing value was rather simply adjustable. The proposed model can be used either as a low-pass filter for preprocessing of interferograms, or as a method for extracting informative image fragments, using which it is possible to synthesize the original image.

2

Metody rekonstrukcji powierzchni z interferogramu światła białego bazujące na transformacie Hilberta

Khoma A., Manske E.

Zeszyty Naukowe Politechniki Rzeszowskiej. Elektrotechnika

|

2015

|

z. 34 [292], nr 4

71--75

PL

W pracy zaprezentowano oparte na transformacie Hilberta metody rekonstrukcji profilu powierzchni nieliniowej na podstawie interferogramu światła białego. Zbadano dokładność tych metod na przykładzie rekonstrukcji powierzchni kulistej. Badania obejmowały rekonstrukcję powierzchni na podstawie modelu matematycznego interferogramu oraz oszacowanie błędu rekonstrukcji profilu. Największą dokładność uzyskano dla metody estymacji chwilowej fazy interferogramu.

EN

The paper presents methods for nonlinear surface profile reconstruction from the white light interferogram based on Hilbert transform. The accuracy of these methods was analyzed on the example of a spherical surface reconstruction. The method investigation included surface and interferogram synthesis based on the mathematical model and estimation the profile reconstruction error. The method of estimating the instantaneous phase of the interferogram showed the greatest accuracy.

3

DInSAR technique for three-dimensional coastal spit simulation from Radarsat-1 fine mode data

Marghany M.

Acta Geophysica

|

2013

|

Vol. 61, no. 2

478--493

EN

This work presents a new approach to 3D spit simulation using differential synthetic aperture interferometry (DInSAR). In doing so, conventional DInSAR procedures are implemented to three repeat passes of RADARSAT-1 SAR fine mode data (F1). Further, a new application of using fuzzy B-spline algorithm is implemented with phase unwrapping technique. The study shows that the performance of DInSAR method using fuzzy B-spline is better than the DInSAR technique, which is vali- dated by the coefficient of determination r² of 0.96, probability p of 0.002, and accuracy (RMSE) of ± 0.034 m, with 90 per cent confidence intervals. In conclusion, integration of fuzzy B-spline with phase unwrapping produces an accurate 3D coastal geomorphology reconstruction.

4

Conversion of photographically recorded interference pattern into equidenses

Pichal J.

Journal of Technical Physics

|

2004

|

Vol. 45, no 3

253-258

EN

The paper presents a method simplifying the photographically registered interference fringe contours or profiles. The classical, commonly used, laboured and time-consuming method of fringe profile photometrical evaluation is replaced by a method of processing, based on the Sabattier effect reducing the interference fringes to equidenses - locuses of points of maximal density (of "blackening"). The described method substantially speeds up the interference fringe evaluation and might be useful also in cases when due to poor quality of the recorded interferogram, other methods of evaluation are in practice inapplicable.

5

Badanie niejednorodności współczynnika załamania kryształów laserowych

Pawlata A., Chabros W.

Biuletyn Wojskowej Akademii Technicznej

|

2003

|

Vol. 52, nr 4

41-53

PL

W celu przeprowadzenia badań niejednorodności współczynnika załamania kryształów laserowych zbudowano układ optyczny, będący połączeniem interferometru Macha-Zendera i polaryskopu. Dla testowanego kryształu rejestrowana jest para obrazów: interferogram oraz obraz polaryskopowy. Na podstawie interferogramu oceniana jest niejednorodność rozciągła współczynnika załamania, natomiast z obrazu polaryskopowego otrzymujemy informację o obszarach kryształu zawierających dwójłomność wymuszoną.

EN

In order to study of laser crystal refraction coefficient an optical system was constructed which was combination of the Mach-Zender interferometer and a polariscope. For the tested crystal a pair of images is recorded: the interferogram and the polariscope image. On the basis of the interferogram is assessed the extent nonhomegenuity of refraction coefficient, however from the polariscope image it was obtained information about crystal regions containing the stimulated birefringence.