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- W2042234549 abstract "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 distortion of the sound field caused by the change in material properties due to temperature gradients. This paper describes two methods for calculating the effects of temperature on ultrasonic propagation in such systems. The first is a ray-tracing method in which 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 through a particular part. The method has been successfully applied to calculating the time of arrival of echoes from various interfaces around a molten weld pool. The second method numerically solves the partial differential equations which describe sound propagation. A previously described computer program [J. A. Johnson, J. Nondest. Eval. 3, 27–37 (1982)] has been modified to account for temperature gradients and used to calculate the sound field as it propagates to a molten weld pool. [Work supported by the U.S. Department of Energy under DOE Contract No. DE-AC07-76ID01570.]" @default.
- W2042234549 created "2016-06-24" @default.
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- W2042234549 date "1984-10-01" @default.
- W2042234549 modified "2023-10-16" @default.
- W2042234549 title "Ultrasonic wave propagation in temperature gradients" @default.
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- W2042234549 doi "https://doi.org/10.1121/1.2021958" @default.
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