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Author: search.filters.author.Krairiksh, MonaiSubject: search.filters.subject.Cauchy method

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    Object Detection of Ground-Penetrating Radar in the Frequency Domain Using Three-Antenna System
    (2022-05-01)
    Kittiyanpunya, Chainarong
    ;
    Krairiksh, Monai
    An object detection method of ground-penetrating radar (GPR) in the frequency domain using three-antenna system is proposed in this study. The presented methodology utilizes the electromagnetic (EM) scattering from the object for identification using its natural poles. Two schemes of GPR system were examined. The first scheme was the conventional GPR comprising one transmitter and one receiver. The second scheme comprises two transmitters and one receiver, which the transmitters were excited by out-of-phase generators with each other. The simulations were initially performed using the three-antenna system for GPR. The results indicated that the natural poles in the scattering responses changed according to the characteristics of the object. For comparison, the three-antenna system for GPR was fabricated and experimented in comparison with the conventional GPR configuration. The experimental results revealed that the three-antenna configuration was able to mitigate the ground bounce and antenna coupling effects, while the conventional GPR was interfered by the effect of ground reflection and mutual coupling of the antennas. The three-antenna configuration is thus suitable to be the front-end before extracting the natural poles. In addition, the frequency domain method is compatible with the three-antenna system in the determination of the natural poles for identification. As such, the proposed system for investigating the response in the frequency domain is operationally appropriate in GPR system.
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    Measured natural frequencies of mangosteens
    (2018-11-15)
    Leekul, Prapan
    ;
    Krairiksh, Monai
    Our previous work demonstrated that nondestructive fruit classification using Cauchy method is applicable for mangosteen. This work illustrated the experimental results that the frequency difference of normal and translucent mangosteens is about 12 MHz.{This frequency difference is sufficient for classifying translucent mangosteens from the normal ones. This technique is very useful for quality control of fruit exporting.
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    Nondestructive Determination of the Maturity of the Durian Fruit in the Frequency Domain Using the Change in the Natural Frequency
    (2016-05-01)
    Tantisopharak, Tanawut
    ;
    Moon, Hongsik
    ;
    Youryon, Pannipa
    ;
    Bunya-Athichart, Kanokpon
    ;
    Krairiksh, Monai
    This paper proposes a nondestructive technique to determine the stages of maturity of durian fruits. The presented methodology utilizes the electromagnetic scattering properties from the fruits over time for identification of the stage of maturity using its natural frequencies. Both simulation and experimental results show that the natural frequencies in the scattering responses change with the maturity of the durian fruit. Particularly, the change in the fundamental resonant frequency is used as a possible identification criterion for characterization of the stage of maturity. This is because the dielectric constant of the core of the fruit changes with its degree of maturity. In addition, the experimental results indicate that the variation of the dominant resonant frequency of durian fruits varies at different stages of maturity and this has the potential to be applied as a criterion to identify the stages of maturity.
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    Investigation of the natural resonant frequencies of palmyrah palm juice for quality control
    (2016-03-07)
    Tantisopharak, Tanawut
    ;
    Keowsawat, Panisa
    ;
    Kanahna, Rachen
    ;
    Krairiksh, Monai
    ;
    Sarkar, Tapan K.
    This paper proposes an identification methodology to distinguish between pure and adulterated palmyrah palm juice. The resonance behavior of the palmyrah palm juice has been investigated through numerical electromagnetic simulation. From the scattered response, the natural frequencies of the palmyrah palm juice are extracted. The identification can be performed by cataloging and comparing these pre computed library of the natural resonant frequencies associated with the standard palmyrah palm juice to check for the quality of the samples to be tested.
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    Identification of maturity of fruit in the frequency domain using its natural frequencies
    (2012-11-26)
    Tantisopharak, Tanawut
    ;
    Krairiksh, Monai
    ;
    Moon, Hongsik
    ;
    Lee, Woojin
    ;
    Sarkar, Tapan
    This paper presents an identification methodology to determine the stage of maturity of a fruit by using its natural resonant frequencies, which can be extracted from its scattering response. Since the dielectric properties of a fruit are determined by its chemical properties, the identification can be performed by comparing the libraries of poles to determine the stage of maturity for that fruit. © 2012 IEEE.