Lamb wave sensing using fiber Bragg grating sensors for delamination detection in composite laminates

2005 ◽  
Author(s):  
N. Takeda ◽  
Y. Okabe ◽  
J. Kuwahara ◽  
S. Kojima
Keyword(s):  
Fiber Bragg Grating ◽  
Lamb Wave ◽  
Composite Laminates ◽  
Bragg Grating ◽  
Delamination Detection ◽  
Fiber Bragg Grating Sensors

Fiber Bragg Grating Sensor/Piezoelectric Actuator Hybrid System for Damage Detection in Composite Laminates

2007 ◽  
Vol 334-335 ◽  
pp. 949-952 ◽  
Author(s):  
Pou Man Lam ◽  
Alan Kin Tak Lau ◽  
Hwa Yaw Tam ◽  
Hang Yin Ling ◽  
Zhong Qing Su ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Hybrid System ◽  
Lamb Wave ◽  
Composite Laminates ◽  
Bragg Grating ◽  
Pzt Actuator ◽  
Fbg Sensor ◽  
Glass Fiber Reinforced ◽  
Bragg Grating Sensor ◽  
Non Destructive

In this paper, fiber Bragg grating (FBG) sensor and piezoelectric (PZT) actuator are used to develop a hybrid system for the evaluation of delamination in glass fiber-reinforced epoxy (GF/EP) composite laminates. The surface-bonded PZT actuator generates ultrasonic Lamb wave in the composite laminates, while the FBG sensor, which is embedded in the composite laminates, captures the Lamb wave signal. Wavelet analysis is introduced to extract signal spectrographic characteristics in the time-scale domain appropriately. Since the propagation characteristics of Lamb wave is altered by the existence of damage in the composite laminates, delamination information can be obtained from the received signal. With the assistance of a signal generation and an acquisition system, this methodology enables active sensing and non-destructive evaluation of delamination in the composite laminates. Experiments have been carried out with GF/EP composite beams to examine the feasibility of the proposed detection technique. The acquired and processed Lamb wave signals corresponding to different delamination sizes are compared.

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