Accurate and fast damage thickness estimation in concrete using handheld GPR and spectral pattern matching

IF 2.1 4区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Tsukasa Mizutani, Shunsuke Iwai
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引用次数: 0

Abstract

Handheld Ground Penetrating Radar (GPR) is utilized for detecting rebar, but detecting damage is difficult due to its low reflectance. This study introduces an algorithm to quantitatively estimate damage thickness from GPR-received waveforms. Simple methods to separate peaks from time waveforms at the top and bottom of the crack prove challenging due to destructive interference and side lobes. In previous studies, it has been confirmed that minor variations in damage thickness affect the frequency property. We propose an algorithm to estimate damage thickness using pattern matching with a theoretical amplitude spectrum that accounts for multiple reflections. Initially, the damage thickness is roughly determined by combining low-frequency spectrum centroids with spectrum amplitude. After roughly estimating the damage thickness, subsequent spectral pattern matching is performed within predefined gating and bandwidth ranges. This approach enables quantitative estimation of damage thickness from 2 mm to 180 mm with a millimeter order accuracy, demonstrating its practical application potential.
利用手持式 GPR 和光谱模式匹配准确快速地估算混凝土中的损伤厚度
手持式地面穿透雷达 (GPR) 可用于探测钢筋,但由于其反射率较低,因此很难探测损坏情况。本研究介绍了一种从 GPR 接收波形中定量估算损坏厚度的算法。由于破坏性干扰和侧叶,从裂缝顶部和底部的时间波形中分离峰值的简单方法证明具有挑战性。在之前的研究中,已经证实损伤厚度的微小变化会影响频率特性。我们提出了一种算法,利用模式匹配与理论振幅频谱(考虑到多重反射)来估算损伤厚度。最初,通过将低频频谱中心点与频谱振幅相结合来大致确定损伤厚度。在大致估算出损伤厚度后,在预定义的选通和带宽范围内进行后续的频谱模式匹配。这种方法能够以毫米级的精度定量估计从 2 毫米到 180 毫米的损伤厚度,显示了其实际应用潜力。
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来源期刊
Advances in Structural Engineering
Advances in Structural Engineering 工程技术-工程:土木
CiteScore
5.00
自引率
11.50%
发文量
230
审稿时长
2.3 months
期刊介绍: Advances in Structural Engineering was established in 1997 and has become one of the major peer-reviewed journals in the field of structural engineering. To better fulfil the mission of the journal, we have recently decided to launch two new features for the journal: (a) invited review papers providing an in-depth exposition of a topic of significant current interest; (b) short papers reporting truly new technologies in structural engineering.
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