Abstract
This paper is a review of published studies involving the use of ground penetrating radar (GPR) on wood structures. It also contains background information to help the reader understand how GPR functions. The use of GPR on wood structures began to grow in popularity at the turn of the millennium. GPR has many characteristics that make it attractive as an inspection tool for wood: it is faster than many acoustic and stress wave techniques; it does not require the use of a couplant; while it can also detect the presence of moisture. Moisture detection is of prime concern, and several researchers have labored to measure internal moisture using GPR. While there have been several laboratory studies involving the use of GPR on wood, its use as an inspection tool on large wood structures has been limited. This review identified knowledge gaps that need to be addressed to improve the efficacy of GPR as a reliable inspection tool of wood structure. Chief among these gaps, is the ability to distinguish the type of internal feature from the GPR output and the ability to identify internal decay.
Highlights
Graduate Program of Forest Science, Southwestern Bahia State University, Bem Querer Drive, Abstract: This paper is a review of published studies involving the use of ground penetrating radar (GPR) on wood structures
Ground penetrating radar (GPR) is a nondestructive inspection tool based upon the electromagnetic (EM) theory that radio wave propagation is governed by the EM properties of a dielectric material [1]
GPR was used to identify the internal features and validated against nondestructive testing methods commonly used for wood, such as stress wave, visual inspection, and resistance drilling
Summary
Ground penetrating radar has several characteristics which make it an attractive inspection tool for wood [1,4,5,6,7,8,9]. The authors moved the antenna by hand at a affixing the−1unit to a carriage, allowing for width scanning beisperformed rate of 0.2 ms and obtained sharp output data. Another advantage is the ability to estimate feature depth in addition to l speed of inspection is much faster than many acoustic or stress wave techniques, which Another combined to as provide a 2D image, referred as aisradargram, of the internal stru advantage is the ability to estimate feature depth in addition to location. Several adjacent 1D scans can be combined to that are visible include internal moisture pockets, knots, voids, and metal connect provide a 2D image, referred to as a radargram, of the internal structure of the inspected abilitySeveral to detect the presence of internal moisture important because object.
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