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