scholarly journals Characterization of the interface roughness of coatings based on ultrasonic reflection coefficient amplitude spectrum

2017 ◽  
Author(s):  
Zhiyuan Ma ◽  
Wei Zhang ◽  
Jianying Gao ◽  
Li Lin ◽  
Sridhar Krishnaswamy
Keyword(s):  
Reflection Coefficient ◽  
Amplitude Spectrum ◽  
Interface Roughness ◽  
Ultrasonic Reflection Coefficient

A Method for Ultrasonic Characterization of Density, Thickness and Velocity of Homogeneous Coating

2011 ◽  
Vol 675-677 ◽  
pp. 1217-1220 ◽  
Author(s):  
Y. Zhao ◽  
Zhen Yue Ma ◽  
Li Lin ◽  
X.M. Li ◽  
M.K. Lei
Keyword(s):  
Experimental Data ◽  
Amplitude Spectrum ◽  
Reference Value ◽  
Nondestructive Method ◽  
Inverse Algorithm ◽  
Ultrasonic Characterization ◽  
Ultrasonic Reflection Coefficient ◽  
Relative Errors

This paper provides a nondestructive method for determination of the density, thickness and velocity of homogeneous coating from an inversion of experimental ultrasonic reflection coefficient amplitude spectrum (URCAS). The detailed analyses of the inverse algorithm and sensitivity of URCAS to the density, thickness and velocity are presented, and the sensitivity is identified as a basis for selecting the experimental data used in inversion. An example of the method and experimental measurement for comparison was given for an epoxy coating with the thickness of 0.277 mm. The relative errors between the inversion and reference value of the density, thickness and velocity were found to be 0.5 %, 3.97 %, and 0.97 %, respectively.

scholarly journals The Characterization of Interface Roughness and Other Defects in Multilayers by X-Ray Scattering

1991 ◽  
pp. 145-149
Author(s):  
S. K. Sinha ◽  
M. K. Sanyal ◽  
A. Gibaud ◽  
S. K. Satija ◽  
C. F. Majkrzak ◽  
...  
Keyword(s):  
Interface Roughness ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Ultrasonic Characterization of EB-PVD Thermal Barrier Coatings Irradiated by HIPIB

2008 ◽  
Vol 373-374 ◽  
pp. 358-362 ◽  
Author(s):  
Li Lin ◽  
Y. Zhao ◽  
J. Chen ◽  
X.M. Li ◽  
M.K. Lei
Keyword(s):  
Reflection Coefficient ◽  
Attenuation Coefficient ◽  
Physical Vapor Deposition ◽  
Ion Beam ◽  
Phase Spectrum ◽  
Transmission Model ◽  
Compact Structure ◽  
Shot Number ◽  
Ultrasonic Reflection Coefficient ◽  
Pulse Echo

High-intensity pulsed ion beam (HIPIB) irradiation at 300 A/cm2 with a shot number of 1, and 5 was performed on the coatings and caused the modification of properties. Porosity and rough surface of EB-PVD (Electron Beam-Physical Vapor Deposition) deposited ZrO2-7%Y2O3 coatings with the thickness of 150 μm on heat-resistant steel have been characterized using the ultrasonic reflection coefficient phase spectrum. With increasing the shot number, the surface remelting and ablating filled gaps and caves between columns, and induced more uniform and compact structure. The ultrasonic measurement was investigated using immersion focusing pulse echo method with a 10 MHz transducer. The ultrasonic reflection coefficient related to frequency, velocity and attenuation coefficient were analyzed based on the acoustic transmission model in a multi-layered structure. For the as-deposited coating and coatings irradiated by HIPIB with the shot number of 1 and 5, the ultrasonic velocity changed from 2950 to 3170, and 3255 m/s respectively. The relationship between the attenuation coefficient and the frequency has been deduced based on the numerical fitting of the phase spectrum. The corresponded expressions are 1.35 α = 0.105 f , 1.2 α = 0.045 f and 1.14 α = 0.035 f , which displays that the attenuation coefficient decreases with the increasing of shot number. The ultrasonic results are in agreement with SEM observations, which have indicated that the coatings became denser and uniform with increasing the shot number. From the velocity and attenuation coefficient, the density, porosity, and microcracks of the coatings can be nondestructively evaluated utilizing the method of this paper.

Grazing-incidence X-Ray Analysis of Surfaces and Thin Films

1991 ◽  
Vol 35 (A) ◽  
pp. 143-150 ◽  
Author(s):  
T. C. Huang
Keyword(s):  
Thin Films ◽  
Depth Profiling ◽  
Grazing Incidence ◽  
Bragg Diffraction ◽  
Interface Roughness ◽  
Phase Identification ◽  
X Ray ◽  
Types Of Information

AbstractGrazing-incidence X-ray analysis techniques which are commonly used for the nondestructive characterization of surfaces and thin films are reviewed. The X-ray reflectivity technicue is used to study surface uniformity and oxidation, layer thickness and density, interface roughness and diffusion, etc. The grazing-incidence in-plane diffraction technique is used to determine in-plane crystallography of epitaxial films. The grazing-incidence asymmetric-Bragg diffraction is used for surface phase identification and structural depth profiling determination of polycrystalline films. Typical examples to illustrate the types of information that can be obtained by the techniques are presented.

A probabilistic study of the ultrasonic reflection coefficient from cortical bones

2015 ◽  
Vol 18 (sup1) ◽  
pp. 1864-1865
Author(s):  
A. Abdoulatuf ◽  
V.-H. Nguyen ◽  
C. Desceliers ◽  
S. Naili
Keyword(s):  
Reflection Coefficient ◽  
Probabilistic Study ◽  
Ultrasonic Reflection Coefficient
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