Non-contact ultrasonic inspection of skin/core bond in honeycomb with lamb waves
- Authors: Cosenza, C; Cerniglia, D; Djordjevic, B
- Publication year: 2002
- Type: Proceedings
- Key words: Engineering (all)
- OA Link: http://hdl.handle.net/10447/201741
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.