Nondestructive Characterization of Enviromental Barrier Coatings Applied to Monolithic Ceramics

2002 ◽  
Author(s):  
W. A. Ellingson ◽  
C. Deemer ◽  
S. Erdman ◽  
A. Parikh
Keyword(s):  
Thermal Imaging ◽  
Optical Scattering ◽  
Test Results ◽  
Infrared Thermal Imaging ◽  
Environmental Barrier Coating ◽  
Barrier Coating ◽  
Turbine Vanes ◽  
Monolithic Ceramics ◽  
Nondestructive Characterization

Full-size silicon nitride gas-turbine vanes coated with an environmental barrier coating (EBC) were evaluated in an exploratory way by two nondestructive methods: polarized elastic optical scattering and infrared thermal imaging. Initial test results indicate that the laser scatter data correlate with EBC thickness. A description of the methods and results of recent tests are presented.

X-Ray Refraction Characterization of the Interface Structure of Ceramics

2000 ◽  
Author(s):  
Manfred P. Hentschel ◽  
Karl-Wolfram Harbich ◽  
Joerg Schors ◽  
Axel Lange
Keyword(s):  
High Performance ◽  
Ceramic Composites ◽  
Interface Structure ◽  
X Rays ◽  
X Ray ◽  
Surfaces And Interfaces ◽  
X Ray Scattering ◽  
Monolithic Ceramics ◽  
Nondestructive Characterization

Advanced ceramics require specific methods for their nondestructive characterization. X-ray refraction techniques determine the specific surfaces and interfaces of high performance ceramics, composites and other low density materials down to nano-meter dimensions. X-ray refraction occurs due to the interference of phase shifted X-rays in ultra small angle X-ray scattering (USAXS) at objects above 100 nm size. Applications to monolithic ceramics and ceramic composites are presented. The well localized mean pore size of ceramics and the crack growth of ceramic composites are measured non-destructively.

scholarly journals Photo-activated raster scanning thermal imaging at sub-diffraction resolution

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
M. Bouzin ◽  
M. Marini ◽  
A. Zeynali ◽  
M. Borzenkov ◽  
L. Sironi ◽  
...  
Keyword(s):  
Thermal Imaging ◽  
Super Resolution ◽  
Far Infrared ◽  
Biological Tissues ◽  
Morphological Properties ◽  
Temperature Variations ◽  
Synthetic Materials ◽  
Skin Biopsies ◽  
Nondestructive Characterization

AbstractActive thermal imaging is a valuable tool for the nondestructive characterization of the morphological properties and the functional state of biological tissues and synthetic materials. However, state-of-the-art techniques do not typically combine the required high spatial resolution over extended fields of view with the quantification of temperature variations. Here, we demonstrate quantitative far-infrared photo-thermal imaging at sub-diffraction resolution over millimeter-sized fields of view. Our approach combines the sample absorption of modulated raster-scanned laser light with the automated localization of the laser-induced temperature variations imaged by a thermal camera. With temperature increments ∼0.5–5 °C, we achieve a six-time gain with respect to our 350-μm diffraction-limited resolution with proof-of-principle experiments on synthetic samples. We finally demonstrate the biological relevance of sub-diffraction thermal imaging by retrieving temperature-based super-resolution maps of the distribution of Prussian blue nanocubes across explanted murine skin biopsies.

A Possible Basis for Nondestructive Characterization of Ropes of Nylon 6

1997 ◽  
Vol 503 ◽  
Author(s):  
H. Jiang ◽  
M. K. Davis ◽  
R. K. Eby ◽  
P. Arsenovic
Keyword(s):  
Tensile Strength ◽  
Service Life ◽  
Fiber Diameter ◽  
Structural Parameters ◽  
Crystal Form ◽  
Nylon 6 ◽  
Remaining Service Life ◽  
Nondestructive Characterization ◽  
Fractional Content

ABSTRACTPhysical properties and structural parameters have been measured for ropes of nylon 6 as a function of the number of use operations. The fractional content of the α crystal form, sound velocity, birefringence, tensile strength and length all increase systematically and significantly with increasing the number of use operations. The fractional content of the γ crystal form and fiber diameter decrease with use. These trends indicate that the measurement of such properties and structural parameters, especially the length, provide a possible basis for establishing a reliable, rapid, and convenient nondestructive characterization method to predict the remaining service life of nylon 6 ropes.

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