TY - GEN
T1 - Characterization of the interface roughness of coatings based on ultrasonic reflection coefficient amplitude spectrum
AU - Ma, Zhiyuan
AU - Zhang, Wei
AU - Gao, Jianying
AU - Lin, Li
AU - Krishnaswamy, Sridhar
N1 - Funding Information:
The China Scholarship Council to support Zhiyuan Ma's study at Northwestern University is gratefully acknowledged.
Publisher Copyright:
© 2017 Author(s).
PY - 2017/2/16
Y1 - 2017/2/16
N2 - In order to nondestructively characterize the interface roughness of coatings effectively, the ultrasonic reflection coefficient amplitude spectrum (URCAS) involving interface roughness was derived based on the phase-screen approximation theory. The interface roughness was determined by a two-parameter inversion combined with a cross-correlation algorithm. For homogeneous coatings, the effects of ultrasonic wavelength λ, beam coverage, and shape variations of the coating on the roughness measurements were analyzed through numerical calculation. A series of simulations indicated that measurement errors were less than 10% when the relationship between interface roughness and wavelength satisfied Rq=1.5%λ∼11%λ approximately. Ultrasonic experiments were carried out on standard roughness specimens utilizing water immersion, flat transducers. The roughness Rq of the standard roughness specimens were 8.5 μm, 14.2 μm, and 28.6 μm measured by confocal laser scanning microscope (CLSM), respectively. Experimental results show that the roughness of standard roughness specimens obtained by the proposed ultrasonic measurement are in good agreement with the CLSM observations, and the relative errors are less than 8.5%.
AB - In order to nondestructively characterize the interface roughness of coatings effectively, the ultrasonic reflection coefficient amplitude spectrum (URCAS) involving interface roughness was derived based on the phase-screen approximation theory. The interface roughness was determined by a two-parameter inversion combined with a cross-correlation algorithm. For homogeneous coatings, the effects of ultrasonic wavelength λ, beam coverage, and shape variations of the coating on the roughness measurements were analyzed through numerical calculation. A series of simulations indicated that measurement errors were less than 10% when the relationship between interface roughness and wavelength satisfied Rq=1.5%λ∼11%λ approximately. Ultrasonic experiments were carried out on standard roughness specimens utilizing water immersion, flat transducers. The roughness Rq of the standard roughness specimens were 8.5 μm, 14.2 μm, and 28.6 μm measured by confocal laser scanning microscope (CLSM), respectively. Experimental results show that the roughness of standard roughness specimens obtained by the proposed ultrasonic measurement are in good agreement with the CLSM observations, and the relative errors are less than 8.5%.
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U2 - 10.1063/1.4974665
DO - 10.1063/1.4974665
M3 - Conference contribution
AN - SCOPUS:85016070019
T3 - AIP Conference Proceedings
BT - 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 36
A2 - Bond, Leonard J.
A2 - Chimenti, Dale E.
PB - American Institute of Physics Inc.
T2 - 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2016
Y2 - 17 July 2016 through 22 July 2016
ER -