Ultrasonic wave propagation in temperature gradients

Autor:	Nancy M. Carlson, John A. Johnson, Layman A. Lott
Rok vydání:	1987
Předmět:	Traverse Materials science Wave propagation business.industry Mechanical Engineering Acoustics Metallurgy Ultrasonic testing Welding law.invention Mechanics of Materials law Nondestructive testing Weld pool Ultrasonic sensor Material properties business
Zdroj:	Journal of Nondestructive Evaluation. 6:147-157
ISSN:	1573-4862 0195-9298
DOI:	10.1007/bf00568010
Popis:	Ultrasonic methods are being developed for sensing and control of high temperature material processes such as welding and solidification. One of the problems in these methods is the distortion of the sound field caused by the change in material properties due to temperature gradients. This paper describes a ray-tracing method for calculating the effects of temperature on ultrasonic propagation in such systems. In the ray-tracing method, the material is conceptually divided into a number of plane layers. The refraction at each layer boundary is calculated from Snell's law using the sound speeds determined from the temperatures of the adjacent layers. The time required for an ultrasonic pulse to traverse each layer is also calculated, allowing the determination of the total time along a particular path. The method is applied to calculating the time of arrival of echoes from various interfaces around a molten weld pool.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d3797d2c10b8c1d6d3f8c049f63bc51a https://doi.org/10.1007/bf00568010 Zobrazit plný text záznamu Full text from SpringerLink