Abstract
In this paper, fiber Bragg gratings (FBGs) were applied to measure dynamic strainsinside a subscale wing under real-time wind tunnel testing. Two re-coated FBGswere embedded in the wing skin. The FBG sensor system includes a wavelengthswept fiber laser with a wavelength indicator and fast signal processing modules.The agreement among the three kinds of sensor inside the subscale wing (FBG,electric strain gauge and PZT sensor) was confirmed in the bench test. Theoptical fiber strain sensors had an excellent resolution (< 5με) inthe time domain and could detect a frequency response up to 100 Hz. Throughthe wind tunnel test of the subscale smart wing, the flutter was experimentallydetected using FBG sensors and their usefulness as an in-flight health monitoringsystem was demonstrated.
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