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Sensors 2016, 16(8), 1273; doi:10.3390/s16081273

Baseline Signal Reconstruction for Temperature Compensation in Lamb Wave-Based Damage Detection

1
School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
2
Aircraft Strength Research Institute of China, Xi’an 710065, China
*
Author to whom correspondence should be addressed.
Academic Editors: Dipen N. Sinha and Cristian Pantea
Received: 22 June 2016 / Revised: 31 July 2016 / Accepted: 3 August 2016 / Published: 11 August 2016
(This article belongs to the Special Issue Ultrasonic Sensors)
View Full-Text   |   Download PDF [2914 KB, uploaded 11 August 2016]   |  

Abstract

Temperature variations have significant effects on propagation of Lamb wave and therefore can severely limit the damage detection for Lamb wave. In order to mitigate the temperature effect, a temperature compensation method based on baseline signal reconstruction is developed for Lamb wave-based damage detection. The method is a reconstruction of a baseline signal at the temperature of current signal. In other words, it compensates the baseline signal to the temperature of current signal. The Hilbert transform is used to compensate the phase of baseline signal. The Orthogonal matching pursuit (OMP) is used to compensate the amplitude of baseline signal. Experiments were conducted on two composite panels to validate the effectiveness of the proposed method. Results show that the proposed method could effectively work for temperature intervals of at least 18 °C with the baseline signal temperature as the center, and can be applied to the actual damage detection. View Full-Text
Keywords: Hilbert transform; orthogonal matching pursuit; lamb waves; temperature compensation; damage detection Hilbert transform; orthogonal matching pursuit; lamb waves; temperature compensation; damage detection
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Liu, G.; Xiao, Y.; Zhang, H.; Ren, G. Baseline Signal Reconstruction for Temperature Compensation in Lamb Wave-Based Damage Detection. Sensors 2016, 16, 1273.

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