ULTRASONIC INSPECTION OF COMPOSITE STRUCTURES: Ultrasonic inspection techniques are needed to assure the integrity of aircraft structures, especially those made of composite materials

摘要

Ultrasonic nondestructive testing equipment is widely applied in the aerospace sector, for inspection both during manufacture and in service. The technique relies on high-frequency sound, generally between 0.5 and 15 MHz, which is directed into the item to be inspected. In the pulse-echo technique, the same transducer is used for pulse emission and echo reception from one side of the item under test. The goal remains to characterize any echoes reflected from flaws or discontinuities.