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摘要:
FFC (Flexible Flat Cable) type magnetostrictive transducers are developed and used to generate and receive L(0, 1) mode at 160 kHz for the achievement of ultrasonic guided wave inspection of steel strands. FFC which is the sensitive part of developed transducer adopts positive reverse positive configuration and PCB circuit is designed and manufactured for FFC connection. In experiments, FFC type magnetostrictive transducers implement the generation and reception of optimized ultrasonic longitudinal guided wave mode. Impedance matching is achieved to improve the generation and reception efficiency of the developed transducers. Amplitudes and signal-to-noise ratio of received signals increases obviously after impedance matching. Received original signals are denoised effectively by using the method of multi-level discrete wavelet decomposition and single branch reconstruction and the identification to these signals become easier. These research results show that developed FFC type magnetostrictive transducers can be used for the generation and receiption of chosen ultrasonic guided wave mode and have the potential of health inspection of steel strands based on ultrasonic guided wave technology.
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来源 :
Journal of Beijing University of Technology
ISSN: 0254-0037
年份: 2009
期: SUPPL.
卷: 35
页码: 1-5