Multiplxed Strain Monitoring of Composite Structures Using Fiber Bragg Grating Sensors

In this paper, we present an improved FBG sensor system using a wavelength swept fiber laser(WSFL) for internal strain monitoring of composite laminates. The WSFL provides unique and functional output characteristics useful for sensor interrogation. In addition a realtime signal processing program was made to measure strains. Five FBG sensors in an optical fiber were used to measure internal strain of the laminated composite under 4 point bending. Experiments showed that the constructed FBG sensor system and the real-time signal processing program could successfully measure the internal strain of composite laminates.