In Chap. 2 we modeled an ultrasonic system as a series of LTI systems, each describing a particular process. Most of those processes involved phenomena associated with wave motion, such as generating pressure waves in a fluid, transmitting pressure waves into a solid in the form of elastic waves, scattering those elastic waves by flaws, etc. Chapter 3 develops fundamental equations governing both pressure waves in a fluid and elastic waves in a solid. In later chapters in this book, these equations provide the basis for obtaining explicit mathematical models for many LTI systems contained in an NDE ultrasonic measurement.
KeywordsElastic Wave Wave Speed Elastic Solid Compressible Fluid Bulk Wave
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