Mirror Reflectance Spectrum Modeling of Smooth Samples

2013 ◽  
Vol 33 (6) ◽  
pp. 0612008
Author(s):  
邹喜仁 Zou Xiren ◽  
白璐 Bai Lu ◽  
吴振森 Wu Zhensen
Keyword(s):  
Reflectance Spectrum ◽  
Spectrum Modeling ◽  
Mirror Reflectance

scholarly journals Identification of pigments in artworks by inverse tangent derivative of spectrum and a new filtering method

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
F. Fazlali ◽  
S. Gorji Kandi
Keyword(s):  
Reflectance Spectrum ◽  
Practical Method ◽  
Chemical Methods ◽  
Munk Function ◽  
Absorption Of Light ◽  
Spectrophotometric Data ◽  
First Time ◽  
Non Destructive ◽  
Derivatives Of

Abstract Employing an economical and non-destructive method for identifying pigments utilized in artworks is a significant aspect for preserving their antiquity value. One of the non-destructive methods for this purpose is spectrophotometry, which is based on the selected absorption of light. Mathematical descriptive methods such as derivatives of the reflectance spectrum, the Kubelka–Munk function and logarithm have been employed for the characterization of the peak features corresponding to the spectrophotometric data. In the present study, the mentioned mathematical descriptive methods were investigated with the aim to characterize the constituents of an Iranian artwork but were not efficient for the samples. Therefore, inverse tangent derivative equation was developed on spectral data for the first time, providing considerable details in the profile of reflectance curves. In the next part, to have a simpler and more practical method it was suggested to use filters made up of pure pigments. By using these filters and placing them on the samples, imaging was done. Then, images of samples with and without filter were evaluated and pure pigments were distinguished. The mentioned methods were also used to identify pigments in a modern Iranian painting specimen. The results confirmed these methods with reliable answers indicating that physical methods (alongside chemical methods) can also be effective in determining the types of pigments.

scholarly journals Optical Response Associated with the Orientation and Structure of Liquid Crystals with Respect to Phosphatidylcholine Concentration

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 678
Author(s):  
Yuqi Han ◽  
Yan Jiang ◽  
Wei Guo ◽  
Bing Li ◽  
Lu Zhang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Reflectance Spectrum ◽  
Optical Response ◽  
The Self ◽  
Cholesteric Liquid Crystals ◽  
Anchoring Effect ◽  
Self Assembling ◽  
Sensitization Effect ◽  
Structure Of Liquid

Based on the anchoring effect due to the self-assembling behavior of the phospholipid molecules at the interface between the liquid crystal and water phases on the orientation of liquid crystals, the optical response associated with the orientation and structure of liquid crystals with respect to the concentration of 1,2-didodecanoyl-sn-glycero-3-phosphocholine solution has been investigated. The optical response owing to changes in the orientation and structure of the mixed cholesteric liquid crystals with respect to the change in the concentration of phosphatidylcholine has been obtained. Moreover, the feasibility of using as-prepared mixed cholesteric liquid crystals to measure the phosphatidylcholine concentration has been verified. A methodology to measure the reflectance spectrum by using mixed cholesteric liquid crystals to sensitize the phosphatidylcholine concentration has been further realized. The sensitization effect of the mixed cholesteric liquid crystals on the measurement of phosphatidylcholine concentration was also verified.

Origin of surface reflectance spectrum during epitaxy

1997 ◽  
Vol 174 (1-4) ◽  
pp. 544-549 ◽  
Author(s):  
Naoki Kobayashi ◽  
Yasuyuki Kobayashi ◽  
Kunihiko Uwai
Keyword(s):  
Reflectance Spectrum ◽  
Surface Reflectance

Temperature dependence of the reflectance spectrum of bis-(ethylendithio)tetrathiafulvalenium perchlorate, (BEDT-TTF)3(ClO4)2

1988 ◽  
Vol 25 (4) ◽  
pp. 323-331 ◽  
Author(s):  
Hiroyuki Tajima ◽  
Hirohisa Kanbara ◽  
Kyuya Yakushi ◽  
Haruo Kuroda ◽  
Gunzi Saito ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Reflectance Spectrum

Reflectance spectrum of plasmon waveguide interband cascade lasers and observation of the Berreman effect

2011 ◽  
Vol 110 (4) ◽  
pp. 043113 ◽  
Author(s):  
Robert T. Hinkey ◽  
Zhaobing Tian ◽  
Rui Q. Yang ◽  
Tetsuya D. Mishima ◽  
Michael B. Santos
Keyword(s):  
Reflectance Spectrum ◽  
Interband Cascade Lasers ◽  
Cascade Lasers

Robust Beam Hardening Artifacts Reduction for Computed Tomography Using Spectrum Modeling

2019 ◽  
Vol 5 (2) ◽  
pp. 333-342 ◽  
Author(s):  
Wei Zhao ◽  
Dengwang Li ◽  
Kai Niu ◽  
Wenjian Qin ◽  
Hao Peng ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Beam Hardening ◽  
Artifacts Reduction ◽  
Spectrum Modeling

The Interrelation between Recurrent and Capital Costs in a Solar Thermal Process Heat System

1981 ◽  
Vol 103 (3) ◽  
pp. 241-243
Author(s):  
L. L. Lukens ◽  
W. P. Schimmel
Keyword(s):  
Energy Cost ◽  
Solar Collector ◽  
Alternative Energy ◽  
Market Penetration ◽  
Heat Temperature ◽  
Capital Costs ◽  
Heat System ◽  
Process Heat ◽  
Cleaning Cost ◽  
Mirror Reflectance

The effect of operation and maintenance (O&M) costs on energy produced by solar collector systems is crucial to the market penetration of solar process heat as an alternative energy source. In the present paper, a particular O&M operation, regular collector cleaning, is considered in order to determine its effect upon annualized life cycle energy cost. A first-order model of mirror reflectance degradation as a function of time is constructed from experimental data taken at Albuquerque, N.M. This is used as input to a systems optimization model of a line-focus solar collector process heat installation. The energy cost variation is considered as a function of cleaning cost per unit of collector aperture and cleaning interval. Results are presented for a process heat temperature of 177°C.

scholarly journals Reflectance Spectrum of a Color Blue Generated by Curved Multilayer and Iridescent of the Elytron of the Calidea Signata Bug

2016 ◽  
Vol 12 (36) ◽  
pp. 1
Author(s):  
Issaka Ouedraogo ◽  
Serge Wendsida Igo ◽  
Priscilla Simonis ◽  
Alioune Ouedraogo ◽  
Belkacem Zeghmati
Keyword(s):  
Multilayer Structure ◽  
Reflectance Spectrum ◽  
Main Peak ◽  
Blue Color ◽  
Transfer Matrices ◽  
Microscopy Characterization ◽  
Two Peaks ◽  
Second Peak ◽  
Scanning Electron Microscopy Characterization ◽  
Scanning Electron

This paper focuses on the study of the origins of blue iridescent reflections of the elytron of Calidea Signata, of the pentatomidae family which is commonly known as bug. Indeed, we use the spectrophotometry measurements, scanning electron microscopy characterization technique, and a ray tracing code program combined with the transfer matrices method, to explain the structure which is responsible for the color of the blue reflections and the iridescent effect. Thus, we noticed that the color of the bug as a result of two peaks. The first and main peak is located at 485.5 nm, corresponding to the blue color. The second peak, is less intense at 525 nm, corresponding to the green-blue color. The numerical reproduction of the reflectance spectrum gives 510.25 nm for the main peak, and 539.5 nm for the secondary peak. These results confirm that the multilayer structure is responsible for the blue color of the Calidea Signata bug. Lastly, the curve of the multilayer is responsible for the iridescence.

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