An optimized guided waves' focus method to eliminate the effect of dispersion

摘要

This paper aims on the guided wave focus. We propose a phase conjugation method with weighted coefficient to focus dispersive guided waves based on the dispersion characteristics. Through deriving the frequency domain expression of guided waves, we give two source signal algorithms, and name them as optimized and weighted phase conjugation, respectively. Then the numerical simulation is conducted, the received waveforms have large amplitude gains and good focus effect. Compared with time reversal method, the optimized and weighted phase conjugation methods regress the side lobes better. Finally, the experimental research is implemented. The experimental results prove the results of numerical simulation.