Overview and comparison of microwave noncontact wood measurement techniques

Bogosanović, Mirjana; Al-Anbuky, Adnan; Emms, Grant

doi:10.1007/s10086-010-1119-0

Cited by 22 publications

(20 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Electromagnetic tomography [31,38,39] Electromagnetic wave permittivity: the tomogram is obtained by variations in the return signal. The variation is reflected by the receiving antenna when the electromagnetic wave emitted by the transmitting antenna encounters a boundary with a different dielectric constant.…”

Section: Technique Principle and Brief Description Key Highlightsmentioning

confidence: 99%

Infrared Thermography Applied to Tree Health Assessment: A Review

Vidal

Pitarma

2019

Agriculture

View full text Add to dashboard Cite

The tree is a fundamental living being. It contributes to nature and climate behaviour, as well to urban greening. It is also a source of wealth and employment. Most tree health inspection techniques are invasive or even destructive. Infrared thermography (IRT) is not invasive, and it has shown advantages when applied for inspection to trees and wood to detect deterioration or voids that could compromise its structure, stability, and durability. This study reviews the literature about IRT applied to a tree health inspection. It is framed in the context of the importance of trees for the balance of ecosystems, and the different techniques to detect tree deterioration. It highlights the difference when applied to wood or trees and the main factors that have been proven to cause disturbances in the thermal pattern of trees. The IRT, as other non-destructive methods, does not distinguish what type of damage it is, nor its causative agent. However, it enables identifying healthy and deteriorated tissues. The technology is very promising since it reveals that is efficient, fast, economical, and sustainable.

show abstract

Section: Technique Principle and Brief Description Key Highlightsmentioning

confidence: 99%

Infrared Thermography Applied to Tree Health Assessment: A Review

Vidal

Pitarma

2019

Agriculture

View full text Add to dashboard Cite

show abstract

“…A review of different microwave wood testing techniques is given in [1] and these include propagation modelling, measurement techniques, hardware implementation, and determination of wood properties. According to [2,3], microwave heating, for example, offers several advantages over other drying methods and chemical procedures because its technique is eco-friendlier and causes less damage in the timber sample compared to employing toxic chemicals.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Focusing Effects of Microwaves inside Wood Due to Timber Ring Structure

Montero

López-Espí

Martinez-Rojas

et al. 2018

Forests

View full text Add to dashboard Cite

Abstract:The aim of this study is the detailed calculation of microwave propagation inside raw timber in cylindrical configurations. Two different approaches have been used. The first one uses an exact formulation and analytical approximations in order to explore the electromagnetic field distribution inside dry wood. The introduction of conductivity in the exact model makes it so complex that the equations are unsuitable for analytical manipulation. In order to further explore the effect of moisture in cylindrical wood structures, a full scale numerical simulation using commercial software has been performed. The results show that for microwave frequencies in the 3 GHz range and for typical wood parameters, a cylindrical log behaves as a kind of Fresnel lens. This work has important applications in microwave treatment and sensing of wood.

show abstract

“…Non-destructive, non-contact microwave inspection of wood shows great potential for application in industry. However, a detailed literature study, reported by the authors et al [1], shows that microwave techniques are still not commonly used. Variability in wood structure presents a major problem and additional indicators of wood properties in the measured microwave transmitted wave would be very beneficial.…”

Section: Introductionmentioning

confidence: 99%

“…A Focused Beam Antenna Technique [8] was used, as its affordability and simplicity recommend it for industrial application [1]. A detailed description of the measurement system is presented in Section II of this paper.…”

Section: Introductionmentioning

confidence: 99%

Utilizing wave polarization in microwave characterization of heterogeneous anisotropic materials with application to the wood industry

Bogosanović

Emms

2014

International Journal on Smart Sensing and Intelligent Systems

View full text Add to dashboard Cite

This paper presents a novel approach to microwave non-contact, non-destructive testing of wood, investigating additional indicators of wood structure, in particular the significance of wave polarization in transmission measurements. Contribution of wave polarization to wood characterization is studied, considering detection of rapid and gradual variations in wood structure, determination of moisture content and density distribution along the sample, as well as bulk properties detection. A set of microwave sensors in a collinear arrangement was used in two orthogonal linear polarizations. Significant findings are reported, in particular polarization dependence of moisture related attenuation, as well as improved defect detection accuracy when measurements in two orthogonal linear polarizations are considered. In addition, sorting wood samples into categories is considered and the advantages of this approach are presented.

show abstract

Overview and comparison of microwave noncontact wood measurement techniques

Cited by 22 publications

References 29 publications

Infrared Thermography Applied to Tree Health Assessment: A Review

Infrared Thermography Applied to Tree Health Assessment: A Review

Numerical Study of Focusing Effects of Microwaves inside Wood Due to Timber Ring Structure

Utilizing wave polarization in microwave characterization of heterogeneous anisotropic materials with application to the wood industry

Contact Info

Product

Resources

About