Water, the most commonly used couplant in ultrasonic testing, is not compatible with certain industrial processes. It may cause permanent damage to many materials, especially to some of the advanced materials used by the aerospace industry. Therefore, QMI developed the unique SONDA-007CX AIRSCAN digital instrumentation and technique, which uses the air of the natural environment as couplant. The method also allows increasing the scanning speed without being constrained by any couplant.
AIRSCAN is a non-contact air-coupled ultrasonic inspection technique which differs from conventional water-immersion testing, water-jet testing and dry-coupled testing by using air as the acoustic coupling media between the transducers and the part under test.
For most practical applications, AIRSCAN is a through-transmission technique, whereby two transducers are used in the process: one transmitter and one receiver. The transducers are located in a fixed relationship to one another with the test piece between them. A very powerful burst of ultrasonic energy is directed by the transmitter toward one surface of the test piece. A small percentage of that energy will pass through the structure and radiate out the opposite side, detectable by the receiver transducer. The degree to which the energy is modified is dependent upon the internal structure of the panel. In the case of a ‘good’ lamination, a readily detectable signal will be available to the receiver transducer; whereas, in the case of a ‘bad’ lamination (non-bond, disbond, void, or inclusion) the signal will be further modified.
AIRSCAN is intended for use with engineered materials, such as:
Laminated Materials like Aluminium Laminates, CFRP Lay-ups, FRP Lay-ups, Bonded Assemblies.