Application of an STFT-based filter in ultrasonic signals for strain monitoring

Lucas Martinho, María F Blasina, Nicolás Pérez, Alan Kubrusly

DOI: 10.14209/sbrt.2019.1570552701

Evento: XXXVII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2019)

Keywords:

Abstract

Monitoring mechanical strain is relevant in several applications. Ultrasonic signals in reverberant media can be used to this purpose by observing the peak of the time reversal or cross-correlation signal. In this paper, we propose a modified technique that uses a new reference signal created using a short-time Fourier Transform based filter to increase the sensitivity to strain. This technique was evaluated in experimental signals and effectively produced up to about fivefold more strain-sensitive signals.

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