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《Fiber Reinforced Plastics/Composites》 2010-03
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XU Yong-chao,DONG En-sheng,JIANG Yi-lin(Department of Aviation Control and Engineering,Aviation University of Air Force,Changchun 130022,China)  
Aiming at detecting damages of composite components on aircraft,a new approach is proposed for research.A uniplanar capacitive sensor with multi-electrode on one plane substrate is designed to apply to the experiment of damage detection for composite components.Square wave is adopted to excite the source electrode of sensor,then the capacitances between the source electrode and the detecting electrodes are measured,and the response signals from the detecting electrodes are sampled and analyzed by fast fourier transform.The effect to sensitivity of the capacitive sensor by square waves with different frequency is discussed.The preliminary experimental results show that,compared with the healthy material,when damage occurs in the composite components,the measured capacitances decrease,and the fundamental amplitude and the harmonic amplitude of FFT spectrums of response signals decrease,and the proposed approach can effectively detect the damages of composite components.The sensitivity of the capacitive sensor improve when the frequency of square wave range from 100Hz to 2MHz.
【CateGory Index】: V250.2
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