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Author: search.filters.author.Sarkar, Tapan K.Subject: search.filters.subject.Cauchy method

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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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    Application of the natural frequency estimation technique for mangosteen classification
    (2014-12-18)
    Leekul, P.
    ;
    Krairiksh, M.
    ;
    Sarkar, Tapan K.
    The problem of identifying unripe fruits using a non-destructive evaluation methodology is of great interest. In this paper the natural frequency estimation methodology described by the singularity expansion method (SEM) is used to evaluate the state of maturity of the mangosteen fruit using a non-destructive classification technique. The methodology is based on a RADAR identification technique based on the scattered field data is used to accomplish this goal. The classification is carried out using the SEM poles computed using the Cauchy method using the scattered field data for a mangosteen as it matures. Then, a pole library is constructed and is used in a classification scheme.