The book "Ultrasonic Nondestructive Evaluation Systems" offers a comprehensive analysis of ultrasonic flaw inspection used in nondestructive testing (NDE). It discusses the application of high-frequency waves for locating and characterizing dangerous material defects, such as cracks. The complex interaction between electrical, electromechanical, and acoustic components is explained in detail to enhance understanding of quantitative flaw measurements. By combining models and measurements, it demonstrates how all elements of an ultrasonic NDE flaw inspection system can be characterized. This includes the pulser/receiver, cabling, transducers, as well as wave propagation and scattering processes. The book presents these extensive modeling and measurement capabilities for the first time and highlights their significant engineering applications, such as the development of new ultrasonic inspections and the optimization of existing procedures. This technology allows for the extraction of information about the nature of the existing flaw from the measured ultrasonic flaw signals, contributing to the assessment of the safety and reliability of materials.