title: Baseline Signal Reconstruction for Temperature Compensation in Lamb Wave-Based Damage Detection.
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.
authors.affiliation: School of Aerospace Engineering, Tsinghua University, Beijing 100084, China. liugq14@mails.tsinghua.edu.cn.
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Liu
authors.affiliation: Aircraft Strength Research Institute of China, Xi'an 710065, China. xiaoyc623@163.com.
authors.forename: Yingchun
authors.initials: Y
authors.lastname: Xiao
authors.affiliation: Aircraft Strength Research Institute of China, Xi'an 710065, China. nantongzh1988@126.com.
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.affiliation: School of Aerospace Engineering, Tsinghua University, Beijing 100084, China. rengx@tsinghua.edu.cn.
authors.forename: Gexue
authors.initials: G
authors.lastname: Ren
keywords: Hilbert transform; damage detection; lamb waves; orthogonal matching pursuit; temperature compensation