Strain Sensitivity Enhancement of Broadband Ultrasonic Signals in Plates Using Spectral Phase Filtering

The focused signal obtained by the time-reversal or cross-correlation techniques of ultrasonic guided waves in plates changes when medium is subject to strain, which can be used monitor strain level. In this paper, sensitivity cross-correlated signals enhanced a post-processing filtering procedure aiming preserve only strain-sensitive spectrum components. Two different strategies were adopted, based on phase either Fourier transform short-time transform. Both use prior knowledge system impulse response at some technique was evaluated an aluminum plate, effectively providing up twice higher strain. increase depends threshold parameter process. Its performance assessed gain, loss energy concentration capability, and value foreknown Signals synthesized with time–frequency representation, through transform, provided better tradeoff between gain concentration.