Improvement of FBG/PZT hybrid sensing system for composite materials

Shinji Komatsuzaki; Seiji Kojima; Akihito Hongo; Nobuo Takeda; Yasuhiro Koshioka

doi:10.1117/12.776079

7 April 2008 Improvement of FBG/PZT hybrid sensing system for composite materials

Shinji Komatsuzaki, Seiji Kojima, Akihito Hongo, Nobuo Takeda, Yasuhiro Koshioka

Proceedings Volume 6933, Smart Sensor Phenomena, Technology, Networks, and Systems 2008; 69330A (2008) https://doi.org/10.1117/12.776079
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

Abstract

We have been developing a system for monitoring the health of aircraft structures made of composite materials. In this system, the Lamb waves that are generated by lead zirconium titanate PZT actuators travel through the composite material structures and are received by the embedded FBG sensors. To detect any Bragg wavelength change due to the reception of the Lamb wave, an arrayed waveguide grating (AWG) is used, which converts the Bragg wavelength change into an output power change. Since the conversion ratio is largely dependent on the initial Bragg wavelength, a temperture control was necessary for obtaining an optimum condition. However, we have developed a system that uses a denser AWG to eliminate the need for a temperature control. We suceeded in detecting 25 kHz to 1 MHz Lamb waves using our new system. We have also tried calculating the Bragg wavelength change of the obtained waveform, and confirmed that the Bragg wavelength change due to the reception of Lamb waves was less than 1 pico meter.

Citation Download Citation

Shinji Komatsuzaki, Seiji Kojima, Akihito Hongo, Nobuo Takeda, and Yasuhiro Koshioka "Improvement of FBG/PZT hybrid sensing system for composite materials", Proc. SPIE 6933, Smart Sensor Phenomena, Technology, Networks, and Systems 2008, 69330A (7 April 2008); https://doi.org/10.1117/12.776079

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