Title :
Thickness of coating tested nondestructively based on Welch frequency
Author :
Qi Lin ; Chun-guang Xu ; Hong-juan Yan ; Shi-yuan Zhou ; Liu Yang
Author_Institution :
Lab. for NDT & Control, Beijing Inst. of Technol., Beijing, China
Abstract :
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.
Keywords :
ceramics; coatings; stainless steel; ultrasonic materials testing; ultrasonic reflection; ultrasonic waves; Welch frequency analysis; Welch power spectrum; ceramics; coating layer; low-frequency immersion focused ultrasonic wave; multiple reflections; nondestructive testing; stainless steel; ultrasonic thickness measurement; Acoustics; Ceramics; Coatings; Frequency measurement; Steel; Thickness measurement; Ultrasonic variables measurement; Welch frequency spectrum; coating; thickness; ultrasonic;
Conference_Titel :
Nondestructive Evaluation/Testing (FENDT), 2014 IEEE Far East Forum on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4799-4731-7
DOI :
10.1109/FENDT.2014.6928245
