Development of High-Sensitivity Ultrasonic Techniques for In-Service Inspection of Nuclear Reactors.

摘要

During the period covered by this report,an ultrasensitive ultrasonic system,incorporating real-time signal averaging,pulse compression,dynamic focusing,and transducer matching,has been developed. The system was shown to be capable of penetrating highly-attenuating material,such as austenitic steel,and of detecting reflections in the presence of strong background signals due to grain scattering.