METHOD AND DEVICE FOR THE AIR-COUPLED ULTRASONIC NON-DESTRUCTIVE TESTING OF A STRUCTURE

摘要

A device (1) for the air-coupled ultrasonic non-destructive testing of a structure (2) comprises at least one emitting probe (10) for emitting ultrasonic waves towards said structure and at least one receiving probe (11) for receiving ultrasonic waves after propogation through said structure, the ultrasonic waves being emitted and received through a gaseous medium without contact between said probes and the structure (2). The emission frequency band (BE) of the at least one emitting probe (10) is narrower than the receiving frequency band (BR) of the at least one receiving probe (11) and lies within the latter. According to one method for the air-coupled ultrasonic non-destructive testing of a structure (2), airborne ultrasonic waves are emitted over an emission frequency band (BE) narrower than the receiving frequency band (BR).