Title :
Laser ultrasonic investigation of laminate disbonding
Abstract :
Contact laser-ultrasonic evaluation (CLUE) provides ultrasonic testing with sharp probe ultrasonic pulse. It makes it possible to enhance spatial resolution at relatively lower frequency band than piezoelectric ultrasonic testing. The advantage of CLUE is the possibility to distinguish the acoustic wave reflection at the soft or rigid boundary. This feature can be effectively used for the investigation of disbonding in laminate structures. The sample consisting of three aluminum shits glued with polymer layers is tested with CLUE. The results of back-reflection coefficient measurement are compared with the numerical simulation. The signatures from regular area and area with disbonded layer are compared. The sensitivity and resolution of testing is discussed.
Keywords :
bonding processes; laminates; measurement by laser beam; photoacoustic effect; polymers; ultrasonic materials testing; ultrasonic reflection; CLUE; acoustic wave reflection; backreflection coefficient measurement; contact laser-ultrasonic evaluation; laminate disbonding; laminate structures; laser ultrasonic investigation; piezoelectric ultrasonic testing; polymer layers; sharp probe ultrasonic pulse; Acoustic pulses; Acoustic reflection; Acoustic testing; Acoustic waves; Frequency; Laminates; Optical pulses; Optical reflection; Probes; Spatial resolution; nondestructive testing; optoacoustic; ultrasonic;
Conference_Titel :
Ultrasonics Symposium (IUS), 2009 IEEE International
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4389-5
Electronic_ISBN :
1948-5719
DOI :
10.1109/ULTSYM.2009.5441449
