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Sensors 2018, 18(2), 649; https://doi.org/10.3390/s18020649

Application of Ground-Penetrating Radar for Detecting Internal Anomalies in Tree Trunks with Irregular Contours

School of Technology, Beijing Forestry University, Beijing 100083, China
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Received: 22 January 2018 / Revised: 17 February 2018 / Accepted: 20 February 2018 / Published: 22 February 2018
(This article belongs to the Special Issue Sensors Signal Processing and Visual Computing)
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Abstract

To assess the health conditions of tree trunks, it is necessary to estimate the layers and anomalies of their internal structure. The main objective of this paper is to investigate the internal part of tree trunks considering their irregular contour. In this respect, we used ground penetrating radar (GPR) for non-invasive detection of defects and deteriorations in living trees trunks. The Hilbert transform algorithm and the reflection amplitudes were used to estimate the relative dielectric constant. The point cloud data technique was applied as well to extract the irregular contours of trunks. The feasibility and accuracy of the methods were examined through numerical simulations, laboratory and field measurements. The results demonstrated that the applied methodology allowed for accurate characterizations of the internal inhomogeneity. Furthermore, the point cloud technique resolved the trunk well by providing high-precision coordinate information. This study also demonstrated that cross-section tomography provided images with high resolution and accuracy. These integrated techniques thus proved to be promising for observing tree trunks and other cylindrical objects. The applied approaches offer a great promise for future 3D reconstruction of tomographic images with radar wave. View Full-Text
Keywords: ground-penetrating radar (GPR); non-destructive testing; tree trunk; internal structure estimation ground-penetrating radar (GPR); non-destructive testing; tree trunk; internal structure estimation
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Li, W.; Wen, J.; Xiao, Z.; Xu, S. Application of Ground-Penetrating Radar for Detecting Internal Anomalies in Tree Trunks with Irregular Contours. Sensors 2018, 18, 649.

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