scholarly journals Surface Topography Measurement of Mirror-Finished Surfaces Using Fringe-Patterned Illumination

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 69 ◽  
Author(s):  
Shaowei Fu ◽  
Fang Cheng ◽  
Tegoeh Tjahjowidodo
Keyword(s):  
Surface Topography ◽  
Intensity Distribution ◽  
Surface Texture ◽  
Large Deviation ◽  
Surface Measurement ◽  
Inspection System ◽  
Distribution Analysis ◽  
Wide Range ◽  
Patterned Illumination ◽  
Luminance Intensity

Mirror-finished surface products have a wide range of applications in different engineering industries, such as power generation, aerospace, semiconductors and optics. The surface topography of mirror-finished products is typically measured in a metrology laboratory, which is typically time consuming and cannot be integrated into the manufacturing process. To allow for in-situ product quality assurance and automatic tool change for manufacturing processes, a more accurate and responsive surface-measurement method is needed. For highly polished surfaces, a sub-micron surface fluctuation makes it possible to use light-scattering effects and image processing for surface texture analysis. A non-contact surface inspection system using a fringe-patterned illumination method is proposed in this paper. A predesigned pattern was projected onto the target surface, and its reflected image was captured by a camera. It was found that the surface parameters Sa and Sq, which are widely used to evaluate surface quality, are significantly correlated with luminous-intensity distribution. Another parameter, Str, which quantifies the uniformity of surface-texture directions due to polishing or grinding marks, was traditionally quantified after a complete-surface topographic measurement. In this research, a new approach is proposed to determine surface isotropy through a luminance-intensity distribution analysis. By rotating the test coupon, the variation of specular reflection showed correlation with the significance of surface-texture direction. The experimental results demonstrate that mirror-finished surfaces with a large deviation in luminance intensity across the pattern possess low Str values, which indicates low uniformity in surface texture.

scholarly journals Reliability of measurements performed in the IZTW accredited laboratory in the field of surface topography and product geometry

Mechanik ◽  
2018 ◽  
Vol 91 (4) ◽  
pp. 307-310
Author(s):  
Tatiana Miller ◽  
Krzysztof Gajda ◽  
Aneta Łętocha
Keyword(s):  
Quality Control ◽  
Surface Topography ◽  
Surface Texture ◽  
Product Quality Control ◽  
Shape Accuracy ◽  
Tests And Measurements ◽  
Angle Measurements ◽  
Wide Range ◽  
Accredited Laboratory ◽  
Surface Texture Analysis

The scope and the reliability of measurements performed in the accredited laboratory in the Section of Length and Angle Measurements in Department of Geometrical Quantities Metrology of the IAMT were presented. The scope of services include the performance of tests and measurements in a very wide range related to surface texture analysis, research tests of dimensional and shape accuracy and product quality control. The capabilities of equipment and software available in the laboratory were characterized.

scholarly journals Vicarious Radiometric Calibration of Ocean Color Bands for FY-3D/MERSI-II at Lake Qinghai, China

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 139
Author(s):  
Shengli Chen ◽  
Xiaobing Zheng ◽  
Xin Li ◽  
Wei Wei ◽  
Shenda Du ◽  
...  
Keyword(s):  
Infrared Imaging ◽  
Large Deviation ◽  
Ocean Color ◽  
Calibration Method ◽  
Surface Measurement ◽  
Radiometric Calibration ◽  
Lake Qinghai ◽  
Vicarious Calibration ◽  
Calibration Methods ◽  
Spectral Imager

To calibrate the low signal response of the ocean color (OC) bands and test the stability of the Fengyun-3D (FY-3D)/Medium Resolution Spectral Imager II (MERSI-II), an absolute radiometric calibration field test of FY-3D/MERSI-II at the Lake Qinghai Radiometric Calibration Site (RCS) was carried out in August 2018. The lake surface and atmospheric parameters were mainly measured by advanced observation instruments, and the MODerate spectral resolution atmospheric TRANsmittance algorithm and computer model (MODTRAN4.0) was used to simulate the multiple scattering radiance value at the altitude of the sensor. The results showed that the relative deviations between bands 9 and 12 are within 5.0%, while the relative deviations of bands 8, and 13 are 17.1%, and 12.0%, respectively. The precision of the calibration method was verified by calibrating the Aqua/Moderate-resolution Imaging Spectroradiometer (MODIS) and National Polar-orbiting Partnership (NPP)/Visible Infrared Imaging Radiometer (VIIRS), and the deviation of the calibration results was evaluated with the results of the Dunhuang RCS calibration and lunar calibration. The results showed that the relative deviations of NPP/VIIRS were within 7.0%, and the relative deviations of Aqua/MODIS were within 4.1% from 400 nm to 600 nm. The comparisons of three on-orbit calibration methods indicated that band 8 exhibited a large attenuation after launch and the calibration results had good consistency at the other bands except for band 13. The uncertainty value of the whole calibration system was approximately 6.3%, and the uncertainty brought by the field surface measurement reached 5.4%, which might be the main reason for the relatively large deviation of band 13. This study verifies the feasibility of the vicarious calibration method at the Lake Qinghai RCS and provides the basis and reference for the subsequent on-orbit calibration of FY-3D/MERSI-II.

scholarly journals Two-Dimensional Fluorescence Intensity Distribution Analysis: Theory and Applications

2000 ◽  
Vol 78 (4) ◽  
pp. 1703-1713 ◽  
Author(s):  
Peet Kask ◽  
Kaupo Palo ◽  
Nicolas Fay ◽  
Leif Brand ◽  
Ülo Mets ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Intensity Distribution ◽  
Distribution Analysis ◽  
Two Dimensional ◽  
Analysis Theory ◽  
Fluorescence Intensity Distribution Analysis

scholarly journals Functional Importance of Surface Texture Parameters

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5326
Author(s):  
Pawel Pawlus ◽  
Rafal Reizer ◽  
Michal Wieczorowski
Keyword(s):  
Literature Review ◽  
Surface Topography ◽  
Surface Texture ◽  
3D Analysis ◽  
Functional Importance ◽  
Hybrid Functional ◽  
Functional Feature ◽  
Texture Parameters ◽  
Future Challenges ◽  
Selection Of

Areal 3D analysis of surface texture gives more opportunities than a study of 2D profiles. Surface topography evaluation, considered as 3D dimensional analysis in micro or nanoscales, plays an important role in many fields of science and life. Among many texture parameters, those connected with height are the most often used. However, there are many other parameters and functions that can provide additional important information regarding functional behaviour of surfaces in different applications. The knowledge about the functional importance of various surface properties is low. This review tries to fill this gap. Surface texture parameters are presented in various groups: height, spatial, hybrid, functional, feature, and others. Based on experiences of the present authors and literature review, the relationships among various surface parameters and functional properties are described. A proposal of a selection of parameters on the basis of their functional significations is provided. Considerations for future challenges are addressed.

scholarly journals Spatial intensity distribution analysis quantifies the extent and regulation of homodimerization of the secretin receptor

2017 ◽  
Vol 474 (11) ◽  
pp. 1879-1895 ◽  
Author(s):  
Richard J. Ward ◽  
John D. Pediani ◽  
Kaleeckal G. Harikumar ◽  
Laurence J. Miller ◽  
Graeme Milligan
Keyword(s):  
G Protein ◽  
Intensity Distribution ◽  
Transmembrane Domain ◽  
Distribution Analysis ◽  
Wild Type ◽  
Spatial Intensity Distribution ◽  
Spatial Intensity ◽  
Secretin Receptor ◽  
Dimeric Form ◽  
Type Receptor

Previous studies have indicated that the G-protein-coupled secretin receptor is present as a homodimer, organized through symmetrical contacts in transmembrane domain IV, and that receptor dimerization is critical for high-potency signalling by secretin. However, whether all of the receptor exists in the dimeric form or if this is regulated is unclear. We used measures of quantal brightness of the secretin receptor tagged with monomeric enhanced green fluorescent protein (mEGFP) and spatial intensity distribution analysis to assess this. Calibration using cells expressing plasma membrane-anchored forms of mEGFP initially allowed us to demonstrate that the epidermal growth factor receptor is predominantly monomeric in the absence of ligand and while wild-type receptor was rapidly converted into a dimeric form by ligand, a mutated form of this receptor remained monomeric. Equivalent studies showed that, at moderate expression levels, the secretin receptor exists as a mixture of monomeric and dimeric forms, with little evidence of higher-order complexity. However, sodium butyrate-induced up-regulation of the receptor resulted in a shift from monomeric towards oligomeric organization. In contrast, a form of the secretin receptor containing a pair of mutations on the lipid-facing side of transmembrane domain IV was almost entirely monomeric. Down-regulation of the secretin receptor-interacting G-protein Gαs did not alter receptor organization, indicating that dimerization is defined specifically by direct protein–protein interactions between copies of the receptor polypeptide, while short-term treatment with secretin had no effect on organization of the wild-type receptor but increased the dimeric proportion of the mutated receptor variant.

Intensity Distribution Analysis of Axicon Lens by Numerical Angular Spectrum Method

2012 ◽  
Vol 32 (12) ◽  
pp. 1207001
Author(s):  
张旭升 Zhang Xusheng ◽  
何川 He Chuan ◽  
撖芃芃 Han Pengpeng
Keyword(s):  
Intensity Distribution ◽  
Angular Spectrum ◽  
Distribution Analysis ◽  
Spectrum Method ◽  
Angular Spectrum Method

scholarly journals Effect of Laser Pulse Overlap and Scanning Line Overlap on Femtosecond Laser-Structured Ti6Al4V Surfaces

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 969 ◽  
Author(s):  
Georg Schnell ◽  
Ulrike Duenow ◽  
Hermann Seitz
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Surface Topography ◽  
Cell Attachment ◽  
Surface Structures ◽  
Laser Source ◽  
Laser Machining ◽  
Scanning Strategy ◽  
Wide Range ◽  
Scanning Line

Surface structuring is a key factor for the tailoring of proper cell attachment and the improvement of the bone-implant interface anchorage. Femtosecond laser machining is especially suited to the structuring of implants due to the possibility of creating surfaces with a wide variety of nano- and microstructures. To achieve a desired surface topography, different laser structuring parameters can be adjusted. The scanning strategy, or rather the laser pulse overlap and scanning line overlap, affect the surface topography in an essential way, which is demonstrated in this study. Ti6Al4V samples were structured using a 300 fs laser source with a wavelength of 1030 nm. Laser pulse overlap and scanning line overlap were varied between 40% and 90% over a wide range of fluences (F from 0.49 to 12.28 J/cm²), respectively. Four different main types of surface structures were obtained depending on the applied laser parameters: femtosecond laser-induced periodic surface structures (FLIPSS), micrometric ripples (MR), micro-craters, and pillared microstructures. It could also be demonstrated that the exceedance of the strong ablation threshold of Ti6Al4V strongly depends on the scanning strategy. The formation of microstructures can be achieved at lower levels of laser pulse overlap compared to the corresponding value of scanning line overlap due to higher heat accumulation in the irradiated area during laser machining.

Multi-Scale Study of Abrasion Signature by 2D Wavelet Decomposition

2005 ◽  
Author(s):  
H. Zahouani ◽  
S. Mezghani ◽  
R. Vargiolu ◽  
M. Dursapt
Keyword(s):  
Surface Topography ◽  
Wavelet Decomposition ◽  
High Performance ◽  
Industrial Applications ◽  
Point Of View ◽  
Continuous Wavelet ◽  
New Approach ◽  
Multi Scale ◽  
Abrasive Finishing ◽  
Wide Range

The high performance of industrial applications, requires increasingly technical functional surfaces, particulary from the point of view of topography and microtexture. To study the effect of abrasive finishing in a wide range of wavelengths of surface topography, we developed a multi-scale approach, based on the decomposition of surface topography by 2D continuous wavelet transform. This new approach made it possible to determine the multi-scale transfer function of machining by abrasion for each stage of finishing. The methodology can be extended to characterize abrasive wear in a wide range of scales.

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