Signal Processing Techniques for Recovering Input Waveforms in Dispersive Lamb Wave Propagation

분산성 램파의 전파에서 입력 파형의 복원을 위한 신호처리

An experimental study has been made with the use of time reversal concepts to recover the input waveform in a long range propagation of dispersive Lamb waves. Three techniques have been tested: Regular TR, 1 bit TR and Inverse filter (IF). The IF approach was found to completely recover the original input signal. Moreover, the IF technique significantly increases the contrast, i.e., the ratio of the recovered signal and the sideband signal.