Acoustic Emission and Acousto-Ultrasonic Monitoring in High-Temperature Environments

This chapter presents a summary of works completed towards the understanding of acoustic emission (AE) and acousto-ultrasonic (AU) monitoring in high-temperature environments. An expanding interest into the development of hypersonic vehicles, operating at Mach numbers greater than five, presents challenges with aerodynamic heating at temperatures exceeding 1000 °C. Monitoring of high-risk systems such as turbojet engines operating at high temperatures present similar challenges for vehicles currently in operation. This work comprises a short review of research into the effects of temperature for AE/AU monitoring as well as the sensors and actuators (S&As) that may be employed in these environments. A discussion is provided regarding considerations and techniques for the future of in situ integrated vehicular health monitoring (IVHM) for AE/AU at high temperatures.