Thickness of coating tested nondestructively based on Welch frequency

A method for ultrasonic thickness measurement of coatings by Welch power spectrum is described. The multiple reflections of ultrasonic waves in coating layer lead to a series of maximum energy occurred in the Welch power spectrum which can be implemented to evaluate the thickness of coatings. A grea...

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Bibliographic Details
Published in2014 IEEE Far East Forum on Nondestructive Evaluation/Testing pp. 117 - 121
Main Authors Qi Lin, Chun-guang Xu, Hong-juan Yan, Shi-yuan Zhou, Liu Yang
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2014
Subjects
Acoustics
Ceramics
coating
Coatings
Frequency measurement
Steel
thickness
Thickness measurement
ultrasonic
Ultrasonic variables measurement
Welch frequency spectrum
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ISBN1479947318
9781479947317
DOI10.1109/FENDT.2014.6928245

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Summary:A method for ultrasonic thickness measurement of coatings by Welch power spectrum is described. The multiple reflections of ultrasonic waves in coating layer lead to a series of maximum energy occurred in the Welch power spectrum which can be implemented to evaluate the thickness of coatings. A great of experiments verified it is effective and feasible to test nondestructively coating thickness on stainless steel and ceramics used as the substrate by the low-frequency immersion focused ultrasonic wave. The relative errors between the evaluated and actual thickness are estimated less than 6%.The results has proven the feasibility of thickness of coating tested nondestructively based on Welch frequency analysis.
ISBN:1479947318
9781479947317
DOI:10.1109/FENDT.2014.6928245