Microwave Imaging of Voids in Oil Palm Trunk Applying UWB Antenna and Robust Time-Reversal Algorithm

The oil palm trees in Southeast Asia face a great challenge due to voids within tree trunks. Besides, both plantations and the palm oil industry suffered considerable losses due to ineffective inspection of defective trees. Several techniques such as ultrasound, X-ray, capacitive volume, gamma compu...

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Main Authors: Saeidi, T., Ismail, I., Mahmood, S.N., Alani, S., Alhawari, A.R.H.
Format: Article
Published: Hindawi Limited 2020
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85094826543&doi=10.1155%2f2020%2f8895737&partnerID=40&md5=d4f7edec72ff5b3ca3beb33fdda0a1e6
http://eprints.utp.edu.my/23371/
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spelling my.utp.eprints.233712021-08-19T07:23:38Z Microwave Imaging of Voids in Oil Palm Trunk Applying UWB Antenna and Robust Time-Reversal Algorithm Saeidi, T. Ismail, I. Mahmood, S.N. Alani, S. Alhawari, A.R.H. The oil palm trees in Southeast Asia face a great challenge due to voids within tree trunks. Besides, both plantations and the palm oil industry suffered considerable losses due to ineffective inspection of defective trees. Several techniques such as ultrasound, X-ray, capacitive volume, gamma computed tomography, and microwave tomography were applied to detect and control the decay of a trunk. However, all the techniques showed substantial drawbacks (such as limited resolution, tedious processing time, and use of bulky equipment with limited mobility) except for microwave tomography which overtook the other techniques by using a method that distinguishes the dielectric properties of healthy and diseased trunks. This work proposes ultra-wide-band (UWB) signal transmission and reception using antenna sensor arrays that record reflections from affected regions in the trunk. Various factors have been considered, such as different cylindrical arrays of 4, 8, 12, and 16 antennas; different positions of hollows; a heterogeneous trunk; multiple targets; and larger trunk samples (16-30 cm). To validate the system's capabilities, two cylindrical wood samples with different diameters of 100 mm and 140 mm and with one hollow and three hollows within are 3D-printed, investigated, and then measured. The authors recommended a robust time-reversal algorithm (RTR) to reconstruct 2D images that successfully identified and localized cavities with the smallest diameter of 3.5 mm. Furthermore, reconstructed images of measured data verified a practical and reliable oil palm trunk imaging and sensing system with a high structural similarity index and resolution. © 2020 Tale Saeidi et al. Hindawi Limited 2020 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85094826543&doi=10.1155%2f2020%2f8895737&partnerID=40&md5=d4f7edec72ff5b3ca3beb33fdda0a1e6 Saeidi, T. and Ismail, I. and Mahmood, S.N. and Alani, S. and Alhawari, A.R.H. (2020) Microwave Imaging of Voids in Oil Palm Trunk Applying UWB Antenna and Robust Time-Reversal Algorithm. Journal of Sensors, 2020 . http://eprints.utp.edu.my/23371/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
description The oil palm trees in Southeast Asia face a great challenge due to voids within tree trunks. Besides, both plantations and the palm oil industry suffered considerable losses due to ineffective inspection of defective trees. Several techniques such as ultrasound, X-ray, capacitive volume, gamma computed tomography, and microwave tomography were applied to detect and control the decay of a trunk. However, all the techniques showed substantial drawbacks (such as limited resolution, tedious processing time, and use of bulky equipment with limited mobility) except for microwave tomography which overtook the other techniques by using a method that distinguishes the dielectric properties of healthy and diseased trunks. This work proposes ultra-wide-band (UWB) signal transmission and reception using antenna sensor arrays that record reflections from affected regions in the trunk. Various factors have been considered, such as different cylindrical arrays of 4, 8, 12, and 16 antennas; different positions of hollows; a heterogeneous trunk; multiple targets; and larger trunk samples (16-30 cm). To validate the system's capabilities, two cylindrical wood samples with different diameters of 100 mm and 140 mm and with one hollow and three hollows within are 3D-printed, investigated, and then measured. The authors recommended a robust time-reversal algorithm (RTR) to reconstruct 2D images that successfully identified and localized cavities with the smallest diameter of 3.5 mm. Furthermore, reconstructed images of measured data verified a practical and reliable oil palm trunk imaging and sensing system with a high structural similarity index and resolution. © 2020 Tale Saeidi et al.
format Article
author Saeidi, T.
Ismail, I.
Mahmood, S.N.
Alani, S.
Alhawari, A.R.H.
spellingShingle Saeidi, T.
Ismail, I.
Mahmood, S.N.
Alani, S.
Alhawari, A.R.H.
Microwave Imaging of Voids in Oil Palm Trunk Applying UWB Antenna and Robust Time-Reversal Algorithm
author_facet Saeidi, T.
Ismail, I.
Mahmood, S.N.
Alani, S.
Alhawari, A.R.H.
author_sort Saeidi, T.
title Microwave Imaging of Voids in Oil Palm Trunk Applying UWB Antenna and Robust Time-Reversal Algorithm
title_short Microwave Imaging of Voids in Oil Palm Trunk Applying UWB Antenna and Robust Time-Reversal Algorithm
title_full Microwave Imaging of Voids in Oil Palm Trunk Applying UWB Antenna and Robust Time-Reversal Algorithm
title_fullStr Microwave Imaging of Voids in Oil Palm Trunk Applying UWB Antenna and Robust Time-Reversal Algorithm
title_full_unstemmed Microwave Imaging of Voids in Oil Palm Trunk Applying UWB Antenna and Robust Time-Reversal Algorithm
title_sort microwave imaging of voids in oil palm trunk applying uwb antenna and robust time-reversal algorithm
publisher Hindawi Limited
publishDate 2020
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85094826543&doi=10.1155%2f2020%2f8895737&partnerID=40&md5=d4f7edec72ff5b3ca3beb33fdda0a1e6
http://eprints.utp.edu.my/23371/
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