Title :
Non-contact ultrasonic inspection of skin/core bond in honeycomb with Lamb waves
Author :
Cosenza, Claudio ; Cerniglia, Donatella ; Djordjevic, B. Boro
Author_Institution :
Dept. of Mech. & Aeronaut., Palermo Univ., Italy
Abstract :
The assessment of skin/core bond in honeycomb samples was carried out by a bistatic ultrasonic non-contact system. Lamb waves were generated by a Nd:YAG pulsed laser and detected by an air-coupled capacitance transducer located in pitch-catch configuration. Periodically spaced line sources, generated on the sample surface using a four element lenticular array, allowed generation of narrow-band directional Lamb waves. Changes in amplitude of the transmitted signal permitted detection of skin/core disbonds.
Keywords :
composite materials; surface acoustic waves; ultrasonic materials testing; Lamb waves; Nd:YAG pulsed laser; air-coupled capacitance transducer; bistatic ultrasonic noncontact system; four element lenticular array; honeycomb; narrow-band directional Lamb waves; noncontact ultrasonic inspection; periodically spaced line sources; pitch-catch configuration; skin/core bond; skin/core disbonds; transmitted signal; Bonding; Honeycomb structures; Inspection; Laser modes; Narrowband; Optical pulse generation; Skin; Surface acoustic waves; Surface emitting lasers; Surface waves;
Conference_Titel :
Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE
Print_ISBN :
0-7803-7582-3
DOI :
10.1109/ULTSYM.2002.1193507
