A New Approach to Guided Wave Ray Tomography for Temperature-Robust Damage Detection Using Piezoelectric Sensors.

Dan Li,Ming Shi,Jianqiu Zhang,Feng Xu,Chengcheng Liu,Dean Ta

doi:10.3390/s18103518

Dan Li, Ming Shi + Show 4 more

Open Access

https://doi.org/10.3390/s18103518

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Abstract

In this paper, a new approach to guided wave ray tomography for temperature-robust damage detection with time-of-flight (TOF) temperature compensation is developed. Based on the linear relationship between the TOF of a guided wave and temperature, analyses show that the TOF of the baseline signal can be compensated by the temperature measurement of the inspected materials without estimating the temperature compensation parameters. The inversion is based on the optimization of the TOF misfit function between the inspected and compensated baseline TOFs of the guided waves, and is applied by the elastic net penalty approach to perform thickness change mapping in a structural health monitoring (SHM) application. Experiments that are conducted in isotropic plates by piezoelectric sensors demonstrate the effectiveness of the proposed method. According to the results, our approach not only eliminates the artefacts that are caused by a temperature variation from 25 °C to 70 °C but also provides more accurate and clearer imaging of damage than conventional ray tomography methods.

Highlights

Damage of industrial infrastructure, aircraft, bridges, pipes, and rails is a significant problem that involves various safety issues [1]
We propose a new approach to guided wave ray tomography for temperature-robust damage detection
The results that are presented in this paper demonstrate that a guided wave that passes through plate-like materials with temperature changes is influenced by the temperature variation

Summary

Introduction

Aircraft, bridges, pipes, and rails is a significant problem that involves various safety issues [1]. In an SHM system that uses guided waves for damage detection, ultrasonic transducers can be permanently attached to plate-like or pipe-like structures. In turn, generates guided waves, which propagate through the structure and interact with damage, and the remaining transducers record the receiving wave motion. These recorded signals can be processed to generate an image with the locations of damage via many algorithms such as travel-time tomography [6,7,8,9], diffraction tomography [10,11], the hybrid algorithm for robust breast ultrasound tomography (HARBUT) algorithms [12,13] and the full waveform inversion (FWI). Damage in inspected materials can cause changes in the guided wave waveforms

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