scholarly journals Unveiling Dolomite Surface Rate Variability Using Vertical Scanning Interferometry

2020 ◽  
Author(s):  
Irshad Bibi ◽  
Andreas Luttge ◽  
Nabeel Khan Niazi
Keyword(s):  
Vertical Scanning Interferometry

scholarly journals Performance Analysis of Surface Reconstruction Algorithms in Vertical Scanning Interferometry Based on Coherence Envelope Detection

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 164
Author(s):  
Dongxu Wu ◽  
Fusheng Liang ◽  
Chengwei Kang ◽  
Fengzhou Fang
Keyword(s):  
Surface Reconstruction ◽  
Measurement Accuracy ◽  
Experimental Studies ◽  
Reconstruction Algorithm ◽  
Low Noise ◽  
Surface Measurement ◽  
Reconstruction Algorithms ◽  
Centroid Method ◽  
Envelope Detection ◽  
Vertical Scanning Interferometry

Optical interferometry plays an important role in the topographical surface measurement and characterization in precision/ultra-precision manufacturing. An appropriate surface reconstruction algorithm is essential in obtaining accurate topography information from the digitized interferograms. However, the performance of a surface reconstruction algorithm in interferometric measurements is influenced by environmental disturbances and system noise. This paper presents a comparative analysis of three algorithms commonly used for coherence envelope detection in vertical scanning interferometry, including the centroid method, fast Fourier transform (FFT), and Hilbert transform (HT). Numerical analysis and experimental studies were carried out to evaluate the performance of different envelope detection algorithms in terms of measurement accuracy, speed, and noise resistance. Step height standards were measured using a developed interferometer and the step profiles were reconstructed by different algorithms. The results show that the centroid method has a higher measurement speed than the FFT and HT methods, but it can only provide acceptable measurement accuracy at a low noise level. The FFT and HT methods outperform the centroid method in terms of noise immunity and measurement accuracy. Even if the FFT and HT methods provide similar measurement accuracy, the HT method has a superior measurement speed compared to the FFT method.

Characterization of fibroblast morphology on bioactive surfaces using vertical scanning interferometry

2006 ◽  
Vol 25 (8) ◽  
pp. 523-533 ◽  
Author(s):  
Christopher M. Revell ◽  
Jeffrey A. Dietrich ◽  
C. Corey Scott ◽  
Andreas Luttge ◽  
L. Scott Baggett ◽  
...  
Keyword(s):  
Bioactive Surfaces ◽  
Vertical Scanning Interferometry

scholarly journals Vertical scanning interferometry: A new method to quantify re-/de-mineralization dynamics of dental enamel

2016 ◽  
Vol 32 (10) ◽  
pp. e251-e261 ◽  
Author(s):  
Isabella Pignatelli ◽  
Aditya Kumar ◽  
Kumar Shah ◽  
Magdalena Balonis ◽  
Mathieu Bauchy ◽  
...  
Keyword(s):  
Dental Enamel ◽  
New Method ◽  
Vertical Scanning Interferometry

scholarly journals Weathering by tree-root-associating fungi diminishes under simulated Cenozoic atmospheric CO<sub>2</sub> decline

2014 ◽  
Vol 11 (2) ◽  
pp. 321-331 ◽  
Author(s):  
J. Quirk ◽  
J. R. Leake ◽  
S. A. Banwart ◽  
L. L. Taylor ◽  
D. J. Beerling
Keyword(s):  
Mycorrhizal Fungi ◽  
Biological Activities ◽  
Arbuscular Mycorrhizal ◽  
Tree Roots ◽  
Carbonate Formation ◽  
Low Co2 ◽  
Surface Alteration ◽  
Calcium And Magnesium ◽  
Atmospheric Co2 Concentrations ◽  
Vertical Scanning Interferometry

Abstract. Trees dominate terrestrial biotic weathering of silicate minerals by converting solar energy into chemical energy that fuels roots and their ubiquitous nutrient-mobilising fungal symbionts. These biological activities regulate atmospheric CO2 concentrations ([CO2]a) over geologic timescales by driving calcium and magnesium fluvial ion export and marine carbonate formation. However, the important stabilising feedbacks between [CO2]a and biotic weathering anticipated by geochemical carbon cycle models remain untested. We report experimental evidence for a negative feedback across a declining Cenozoic [CO2]a range from 1500 to 200 ppm, whereby low [CO2]a curtails mineral surface alteration via trenching and etch pitting by arbuscular mycorrhizal (AM) and ectomycorrhizal (EM) fungal partners of tree roots. Optical profile imaging using vertical scanning interferometry reveals changes in nanoscale surface topography consistent with a dual mode of attack involving delamination and trenching by AM and EM fungal hyphae on phyllosilicate mineral flakes. This is consistent with field observations of micropores in feldspar, hornblende and basalt, purportedly caused by EM fungi, but with little confirmatory evidence. Integrating these findings into a process-based biotic weathering model revealed that low [CO2]a effectively acts as a "carbon starvation" brake, causing a three-fold drop in tree-driven fungal weathering fluxes of calcium and magnesium from silicate rock grains as [CO2]a falls from 1500 to 200 ppm. The feedback is regulated through the action of low [CO2]a on host tree productivity and provides empirical evidence for the role of [CO2]a starvation in diminishing the contribution of trees and mycorrhizal fungi to rates of biological weathering. More broadly, diminished tree-driven weathering under declining [CO2]a may provide an important contributory mechanism stabilising Earth's [CO2]a minimum over the past 24 million years.

Lateral Resolution Enhancement of Vertical Scanning Interferometry by Sub-Pixel Sampling

2014 ◽  
Vol 20 (1) ◽  
pp. 90-98 ◽  
Author(s):  
Rolf S. Arvidson ◽  
Cornelius Fischer ◽  
Dale S. Sawyer ◽  
Gavin D. Scott ◽  
Douglas Natelson ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Resolution Enhancement ◽  
Field Of View ◽  
Lateral Resolution ◽  
Large Field ◽  
Vertical Resolution ◽  
Atomic Force ◽  
Scanning Interferometer ◽  
High Vertical Resolution ◽  
Vertical Scanning Interferometry

AbstractWe apply common image enhancement principles and sub-pixel sample positioning to achieve a significant enhancement in the spatial resolution of a vertical scanning interferometer. We illustrate the potential of this new method using a standard atomic force microscope calibration grid and other materials having motifs of known lateral and vertical dimensions. This approach combines the high vertical resolution of vertical scanning interferometry and its native advantages (large field of view, rapid and nondestructive data acquisition) with important increases in lateral resolution. This combination offers the means to address a common challenge in microscopy: the integration of properties and processes that depend on, and vary as a function of observational length.

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