Temat: profilometry - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: A method for improving the precision of on-line phase measurement profilometry
Autorzy:: Mao, Z
Cao, Y
Zhong, L
Cao, S
Tematy:: information optics
Stoilov's algorithm
phase measuring profilometry (PMP)
on-line phase measurement profilometry (OPMP)
phase-shifting
pixel matching; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174406.pdf Link otwiera się w nowym oknie
Opis:: An on-line phase measurement profilometry based on improved Stoilov’s algorithm is proposed to measure the 3D shape of moving object. While only one frame sinusoidal grating is projected on the moving object, the equal phase-shifting step deformed patterns modulated by profile of the measured object can be captured at every equivalent moving distance of the measured object instead of digital phase-shifting. Stoilov’s algorithm is an equal phase-shifting step algorithm at an arbitrary phase-shifting step, which is suitable for on-line phase measurement profilometry. However, the arbitrary phase-shifting step of Stoilov’s algorithm depends on the captured deformed patterns, in which the digitized errors of digital light projector or CCD camera, and the disturbance of surrounding light could be introduced, it will lead to some abnormities in wrapped phase, such as the denominator in Stoilov’s algorithm could be zero, which could cause the reconstructed 3D profile of the measured object appear burr, distortion or aberration, even could not be reconstructed. So an on-line phase measurement profilometry based on improved Stoilov’s algorithm is proposed. The arbitrary phase-shifting step is retrieved by both pixel matching and fringe cycle calibration rather than the captured deformed patterns. Experiments verify the feasibility and effectiveness of the proposed on-line phase measurement profilometry.
Dostawca treści:: Biblioteka Nauki

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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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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

Tytuł:: The three-dimensional imaging of rock wall surface with the use of computer-based image processing and analysis
Autorzy:: Oleszko, K.
Młynarczuk, M.
Tematy:: rock surfaces
image analysis
3D imaging
profilometry; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/178560.pdf Link otwiera się w nowym oknie
Opis:: The paper presents two methods of digital mapping of rock walls in three dimensional space. The methods have been developed with the use of low-cost devices, which enable image acquisition, and processing methods based on digital image processing and analysis. Both methods are based on so-called shadow profilometry. One of those methods involved mapping the shape of the rock wall on casted mapped surface with analyzed laser lines. The second method was based on the analysis of projected set of bit planes. The planes were projected by computer projector. Both measurement methods have been tested in Miękinia porphyry quarry. The study involved rock wall measurements, which were repeated several times. The part of rock material was removed from the measured wall after each measurement. In order to verify the accuracy of the proposed methods of measurement, volume results obtained and based on digital methods were compared to the volume of removed rock material during measurement. Calculated results were characterized by small deviations which prove to be correct, and are a solid basis for further work on practical application of presented methods.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

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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Skocz do pozycji: 6.

Tytuł:: Investigation of surface after erosion using optical profilometry technique
Autorzy:: Tarasiuk, Wojciech
Szymczak, Tadeusz
Borawski, Andrzej
Tematy:: optical profilometry
erosion
surface layer
roughness
3D results; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/221072.pdf Link otwiera się w nowym oknie
Opis:: The paper reports experimental results of the analysis of the 145Cr6 steel surface after erosion using the profilometrical technique by means of interferometry streaks. Erosive tests were carried out using abrasive containing quartz sand used in water jet cutting. Differences in the intensity of erosive wear were dependent on the angle of the abrasive stream (10°; 15°; 20°; 30°; 60°; 90°). In order to determine the characteristic features of the surface layer after the impact of the erosive stream, its characteristic parameters, such as roughness Ra and Sa for linear and field measurements, were analysed. Geometrical features of the regions investigated, such as shape, depth, angle of the abrasive stream, are presented. The analysis was carried out in two-dimensional (2D) and three-dimensional (3D) coordinate systems.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Fringe pattern inpainting based on dual-exposure fused fringe guiding CNN denoiser prior
Autorzy:: Peng, Guangze
Chen, Wenjing
Tematy:: fringe projection profilometry
phase calculation
convolutional neural network
denoiser prior; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2086757.pdf Link otwiera się w nowym oknie
Opis:: The intensity of some pixels of the captured fringe will be saturated when fringe projection profilometry is used to measure objects with high reflectivity, which will significantly affect the reconstruction of the measured object. In this paper, we propose a fringe pattern inpainting method based on the convolutional neural network (CNN) denoiser prior guided by additional information from a fringe captured in short exposure time. First, a binary mask obtained by Otsu algorithm from the modulation information of the short exposure fringe is used to detect the high-saturation region in the normal exposure fringe. Then, the corrected gray-scales of the region of the short exposure fringe selected by the mask are inserted in the saturated region of the normal fringe to form an initial fringe for iteration. At last, fringe pattern inpainting is achieved by using a CNN denoiser prior. The correct phase can be reconstructed from the inpainted fringes. The computer simulation and experiments verify the effectiveness of the proposed method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Analysis of the structure of archeological objects - ceramic pottery
Analiza struktury obiektów archeologicznych - naczyń ceramicznych
Autorzy:: Riegert, D.
Konopka, K.
Tematy:: glina
domieszki
naczynie ceramiczne
mikroskopia stereoskopowa
pottery
clay
admixtures
stereoscopic microscopy
optical profilometry; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/354078.pdf Link otwiera się w nowym oknie
Opis:: The aim of the present study was to check whether the research methods used in materials engineering could be useful for examining archeological ceramic pottery. The experiments were conducted with the use of stereoscopic microscopy, scanning electron microscopy, and optical profilometry. The examined material included pieces of the archeological clay vessels excavated from various sites and dated at two various historical periods. The first group includes samples from the 5th century B.C. from Biehla (Germany) and Starosiedle (Poland), the second group consists of fragments of vessels of the 10th century A.D. from Starosiedle (Poland) and Rosenhof (Germany). The structure of the matrix and the mineral admixtures distributed throughout it were analyzed on the cross-sections of the archeological material. The examinations were performed using the fractographic method and optical profilometery, which permitted determine the shapes and morphology of the admixtures, examine their embedding in the matrix material (clay), and also revealing possible layers or delaminations within the matrix.
Głównym celem pracy przedstawionej w artykule było wykorzystanie metod badawczych stosowanych w inżynierii materiałowej do badania ceramiki archeologicznej. Do badań zastosowano mikroskopię stereoskopową, skaningową mikroskopię elektronową oraz profilometrię optyczną. Materiałem do badań były fragmenty glinianych naczyń archeologicznych pochodzęcych z róznych okresów historycznych i z różnych miejsc, odpowiednio: Biehla i Starosiedle - V w. p.n.e.; Starosiedle i Rosenhof - × w. Analizie poddana była budowa osnowy oraz rozmieszczone w niej domieszki mineralne. W tym celu zastosowano badania faktograficzne i badania przy uzyciu profilometru optycznego powierzchni płaskich powstałych w wyniku cięcia materiału archeologicznego. Badania te pozwoliły na obserwację kształtu, morfologii domieszek, a także stopnia "obtoczenia" ich przez material osnowy — glinę, oraz obecności warstw i rozwarstwień w osnowie.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Abnormal phase removing method in phase measuring profilometry
Autorzy:: Xu, X.
Cao, Y.
Chen, C.
Cao, S.
Peng, K.
Tematy:: information optics
phase measuring profilometry
phase shifting algorithm
phase error
phase auto-extracting; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/173504.pdf Link otwiera się w nowym oknie
Opis:: An abnormal phase removing method in phase measuring profilometry is proposed. In the five equal shifting phase steps algorithm, the shifting phase might be extracted from the deformed patterns captured by CCD camera. But there may be some errors introduced by a digital fringe projector and CCD camera in these deformed patterns. The impurity of the deformed patterns may lead to four classes of abnormalities when extracting the shifting phase. These abnormalities may cause the wrong shifting phase extraction by which the reconstructed object might be misshapen or anamorphic, or even in failure. By this proposed method, the above abnormalities can be removed, and the shifting phase can be auto-extracted precisely from the impure deformed patterns without knowing its value. Experimental results verify the feasibility and effectiveness of the proposed method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Analiza dokładności pomiarów nanometrycznych wzorców mikrogeometrii powierzchni za pomocą mikrointerferometru i profilometru stykowego
Measurement accuracy analysis for microgeometry nanostandards with microinterferometer and stylus profilometer
Autorzy:: Ślusarski, Ł.
Tematy:: nanometrology
depth/height standards
microinterferometry
contact profilometry
nanometrologia
wzorce schodkowe
mikrointerferometr
profilometr stykowy; Pokaż więcej
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:: https://bibliotekanauki.pl/articles/209299.pdf Link otwiera się w nowym oknie
Opis:: W pracy zostały zbadane i przeanalizowane możliwości pomiarowe Samodzielnego Laboratorium Długości GUM w obszarze pomiarów wzorców wysokości nierówności powierzchni (o wysokości nierówności poniżej 1 μm) - tzw. nanowzorców, charakteryzujących powierzchnię w dwóch (2D) i trzech wymiarach (3D). Pomiary wykonano za pomocą mikrointerferometru oraz profilometru stykowego. W toku pomiarów określono możliwy dolny zakres pomiarowy i niepewność dla obu stanowisk.
The goal of the work, described in this paper, was to examine and analyse measurement capabilities of GUM Length and Angle Department in measurements of step height/depth standards with the values below 1 μm (nanostandards), with 2D, and 3D surface characteristics. Measurements were performed with microinterforometer and stylus profilometer.
Dostawca treści:: Biblioteka Nauki

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