Pan Pacific Symposium Conference Proceedings


Author: James C. P. McKeon
Company: Sonix, Inc.
Date Published: 2/18/2003   Conference: Pan Pacific Symposium

Abstract: The use of water to couple ultrasonic waves from an ultrasonic transducer into a sample of interest is well known in scanning acoustic microscopy (SAM). Water is readily available and has been found to be one of the least attenuative couplant fluids. Typically, the water bath is kept at room temperature; however, elevated water temperatures are starting to be considered as a means to simulate in situ conditions for microelectronic packages.

Before this can be done, it is necessary to understand the effect that increased water temperatures will have on the ultrasonic behavior of a SAM system. In this paper, the effect of increased temperature on the time-of-flight, amplitude, and frequency content of the ultrasonic signal as well as the quality of the resulting image will be examined.

Key words: SAM, nondestructive, microelectronics, C-Scans, water bath temperature.

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