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Author: search.filters.author.Mearnchu, Anat

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    Nondestructive measurement for mango inspection
    (2004-12-01)
    Krairiksh, Monai
    ;
    Mearnchu, Anat
    ;
    Phongcharoenpanich, Chuwong
    This research aims to develop a dielectric property measurement system to classify and inspect dielectric object (here is mango). Moment method and geometry theories of diffraction are combined in calculation process of inverse scattering measurement to improve accuracy. Then, a system utilizing such method is developed to operate at 12.4 GHz and calibrated with the measured results in literatures. Measurement results show that the dimension of the object under test should not be too large as compared to the wavelength of the operating frequency, to obtain acceptable accurate results in reasonable short calculation time. For mango measurement, the frequency of 2.45 GHz in Industrial, Scientific and Medical (ISM) band is selected to comply with the mentioned condition. Measured dielectric properties of Namdokmai, Rad and Keausawuay mangoes for various days after harvested are compared to chemical properties, viz., Fructose and pH. The obvious relationship can be found and it is possible to develop a low cost fruit inspection system.
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    Analysis and design of injection-locking steerable active array applicator
    (2002-01-01)
    Thongsopa, Chanchai
    ;
    Krairiksh, Monai
    ;
    Mearnchu, Anat
    ;
    Srimoon, Duang Arthit
    In this paper, the analysis, design and experimental results of active array applicator are presented. The injection-locking technique is used to alter the magnitude of the microwave sources so that the steering of near fields can be achieved. This technique can be applied for microwave hyperthermia cancer treatment to provide the large uniform temperature distribution. The complexity of the system can be reduced by using this technique. The study shows that the temperature distribution can be controlled by varying the modulation index, modulating frequency and initial phase of modulating signal. The temperature distribution is also affected by applicator configuration, spacing between applicators, and heating time. The Spectral Domain approach is used to analyze the near field and then the near field data are used to find the temperature distribution by using the Finite Difference method. The study is carried out at frequency of 2,450 MHz. This design is useful for implementation of the low cost steerable applicator.