Hyperspectral imager calibration using ceramic color tiles (Conference Presentation)

2019 ◽  
Author(s):  
Matti A. Eskelinen ◽  
Clarence J. Zarobila ◽  
David W. Allen
Keyword(s):  
Ceramic Color

scholarly journals Comparison of Shade of Ceramic with Three Different Zirconia Substructures using Spectrophotometer

2015 ◽  
Vol 16 (2) ◽  
pp. 135-140 ◽  
Author(s):  
Syed Rashid Habib ◽  
Ibraheem F Al Shiddi
Keyword(s):  
Maximum Difference ◽  
Mean Values ◽  
Tukey Test ◽  
Ceramic Color ◽  
Significant Difference ◽  
Grand Rapids ◽  
All Ceramic ◽  
The Mean ◽  
Type 3

ABSTRACT Objective This study assessed how changing the Zirconia (Zr) substructure affected the color samples after they have been overlaid by the same shade of veneering ceramic. Materials and methods Three commercial Zr materials were tested in this study: Prettau® Zirconia (ZirKonZahn, Italy), Cercon (Dentsply, Germany) and InCoris ZI (Sirona, Germany). For each system, 15 disk-shaped specimens (10 × 1 mm) were fabricated. Three shades of A1, A2 and A3.5 of porcelain (IPS e.MaxCeram, IvoclarVivadent, USA) were used for layering the specimens. Five specimens from each type of Zr were layered with same shade of ceramic. Color measurements were recorderd by a spectrophotometer Color-Eye® 7000A (X-Rite, Grand Rapids, MI). Mean values of L, a, b color coordinates and ?E were recorded and comparisons were made. Results Differences in the ΔE were recorded for the same porcelain shade with different Zr substructures and affected the color of the specimens (p < 0.01, ANOVA). The maximum difference between the ΔE values for the A1, A2 and A3.5 shades with three types of Zr substructures was found to be 1.59, 1.69 and 1.45 respectively. Multiple comparisons of the ΔE with PostHoc Tukey test revealed a statistically significant difference (p < 0.05) between the three types of Zr, except between Type 2 Zr and Type 3 Zr for the Shade A1. The mean values of L, a, b and ΔE for the Prettau® Zirconia substructure were found to be the least among the three types. Conclusions The brand of Zr used influences the final color of the all ceramic Zr based restorations and this has clinical significance. How to cite this article Habib SR, Al Shiddi IF. Comparison of Shade of Ceramic with Three Different Zirconia Substructures using Spectrophotometer. J Contemp Dent Pract 2015;16(2): 135-140.

Effect of fluorescent and nonfluorescent glaze pastes on lithium disilicate pressed ceramic color at different thicknesses

2020 ◽  
Author(s):  
Marta Revilla-León ◽  
John A. Sorensen ◽  
Leonard Y. Nelson ◽  
Iñaki Gamborena ◽  
Yu Michael Yeh ◽  
...  
Keyword(s):  
Lithium Disilicate ◽  
Ceramic Color

scholarly journals Construction of a ceramic color database

Synthesiology ◽  
2013 ◽  
Vol 6 (2) ◽  
pp. 84-92 ◽  
Author(s):  
Toyohiko SUGIYAMA
Keyword(s):  
Ceramic Color

scholarly journals Radiometric Calibration Targets for the Mastcam-Z Camera on the Mars 2020 Rover Mission

2020 ◽  
Vol 216 (8) ◽  
Author(s):  
K. M. Kinch ◽  
M. B. Madsen ◽  
J. F. Bell ◽  
J. N. Maki ◽  
Z. J. Bailey ◽  
...  
Keyword(s):  
Permanent Magnets ◽  
Central Area ◽  
Image Data ◽  
Radiometric Calibration ◽  
Martian Surface ◽  
Primary Target ◽  
Calibration Target ◽  
Black Paint ◽  
Related Information ◽  
Ceramic Color

AbstractThe Mastcam-Z Camera is a stereoscopic, multispectral camera with zoom capability on NASA’s Mars-2020 Perseverance rover. The Mastcam-Z relies on a set of two deck-mounted radiometric calibration targets to validate camera performance and to provide an instantaneous estimate of local irradiance and allow conversion of image data to units of reflectance (R∗ or I/F) on a tactical timescale. Here, we describe the heritage, design, and optical characterization of these targets and discuss their use during rover operations. The Mastcam-Z primary calibration target inherits features of camera calibration targets on the Mars Exploration Rovers, Phoenix and Mars Science Laboratory missions. This target will be regularly imaged during flight to accompany multispectral observations of the martian surface. The primary target consists of a gold-plated aluminum base, eight strong hollow-cylinder Sm2Co17 alloy permanent magnets mounted in the base, eight ceramic color and grayscale patches mounted over the magnets, four concentric, ceramic grayscale rings and a central aluminum shadow post (gnomon) painted with an IR-black paint. The magnets are expected to keep the central area of each patch relatively free of Martian aeolian dust. The Mastcam-Z secondary calibration target is a simple angled aluminum shelf carrying seven vertically mounted ceramic color and grayscale chips and seven identical, but horizontally mounted ceramic chips. The secondary target is intended to augment and validate the calibration-related information derived from the primary target. The Mastcam-Z radiometric calibration targets are critically important to achieving Mastcam-Z science objectives for spectroscopy and photometric properties.

Fluorescence of ceramic color standards

2010 ◽  
Vol 49 (12) ◽  
pp. 2376 ◽  
Author(s):  
Annette Koo ◽  
John F. Clare ◽  
Kathryn M. Nield ◽  
Andrew Deadman ◽  
Eric Usadi
Keyword(s):  
Ceramic Color

scholarly journals The Effect of Investment Materials on the Color of Feldspathic Ceramics

2011 ◽  
Vol 05 (04) ◽  
pp. 433-440 ◽  
Author(s):  
Gloria Beatriz de Azevedo Cubas ◽  
Sílvia Terra Fontes ◽  
Guilherme Brião Camacho ◽  
Flávio Fernando Demarco ◽  
Tatiana Pereira-Cenci
Keyword(s):  
Color Analysis ◽  
Color Coordinates ◽  
Color Parameters ◽  
Ceramic Color

ABSTRACTObjectives: The aim of this study was to evaluate the influence of investment type on the color of feldspathic ceramics. Methods: Ceramic specimens were constructed using the refractory die technique, using four investments (i.e., Vitadurvest, Duravest, Duceralay Superfit, and Fortune) to observe their effect on the color of five commercially available ceramics (i.e., Super Porcelain EX-3, Vision Esthetic, Vintage Halo, IPS Classic, and Vitadur Alpha). The color analysis of the ceramics was performed with a colorimeter using the CIE L*a*b* color coordinates. Results: The investments produced significant alterations on a*, b*, and L* color parameters of the ceramics tested. The ceramic Vision Esthetic was influenced by the type of investment in all color parameters (P<.05). Two investments (Duravest and Fortune) produced alterations in color parameters with three of the five ceramics tested. Conclusions: The investment materials produced alterations on the ceramic color parameters, resulting in unacceptable chromatic alterations (ΔE*). (Eur J Dent 2011;5:433-440)

Stability of ceramic color reflectance standards

1998 ◽  
Vol 23 (6) ◽  
pp. 408-415 ◽  
Author(s):  
Hugh S. Fairman ◽  
Henry Hemmendinger
Keyword(s):  
Ceramic Color

Ceramic colors

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Gerhard Pfaff
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Metal Oxides ◽  
Colloidal Particles ◽  
Solid State Reactions ◽  
Mixed Metal Oxides ◽  
Bone China ◽  
Application Systems ◽  
Ceramic Color ◽  
Gold Silver

Abstract Ceramic colors or stains consist mainly of pigments, glaze or body, and opacifiers. They are used for the decoration of porcelain, earthenware bone china and other ceramics. Glazes and enamels are the main application systems for ceramic colors. Pigments are the color giving components in the composition of a ceramic color. High temperature and chemical stability as well as high tinting strength are characteristics of stains. Technically important ceramic colors are cadmium sulfide and sulfoselenides (occluded in zircon), metals such as gold, silver, platinum, and copper (as colloidal particles), metal oxides (α-Fe2O3, Cr2O3, CuO, Co3O4/CoO, MnO2/Mn2O3, and NiO/Ni2O3), mixed metal oxides and silicates, zirconia-based and zircon-based compositions. Ceramic colors are often produced using solid state reactions.

Synthesis of Spinel Color Pigments from Aluminum Dross Waste

2018 ◽  
Vol 766 ◽  
pp. 282-287 ◽  
Author(s):  
Niti Yongvanich ◽  
Bovornrat Emtip ◽  
Boonyarit Hengprayoon ◽  
Ekkapot Jankat
Keyword(s):  
Spinel Phase ◽  
Ceramic Pigments ◽  
Blue Color ◽  
Spinel Crystal ◽  
Cobalt Ions ◽  
Aluminum Dross ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Ceramic Color ◽  
State Processing ◽  
Spinel Ceramic

Spinel-based ceramic color pigments were successfully synthesized from utilization of aluminum dross waste and relevant oxide precursors by solid-state processing. Cobalt ions were selected as a chromophore to produce blue pigments. The conventional oxide route was also carried out for comparison purposes. The spinel phase readily formed when fired at 1100 °C; longer duration yielded a higher degree of purity. No preferential orientation of XRD reflection was observed, indicating random crystallographic arrangement. Phase formation was also confirmed by Fourier Transformed Infrared Spectroscopy (FTIR) which displayed both Co-O tetrahedral and Al-O octahedral which are the main framework for a spinel crystal. Slightly sharper FTIR peaks for the dross route compared to those from the oxide route suggest a difference in crystallinity between the two with different precursors. The particle size distribution was relatively wide (5 – 30 micron), possibly due to a crude nature of the dross precursor. The UV-vis spectra showed absorption in the range of 450-550 nm which is associated with the blue color caused by a shift of the 3d7 electrons of Co2+. The obtained dross-route pigments possessed both a and b color parameters (a = -2.3 to-2.6; b = -3.4 to-4.0) in the negative territory, implying greenness and blueness respectively. The L values were in the 20-30 range. When incorporating into practical glazes, the b parameters unexpectedly became more negative, indicating an even deeper blue tone. This result suggested a high potential for utilization of this dross waste as an alternative precursor source for sustainable production of spinel ceramic pigments.

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