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    Analysis of a Sensor using Rician k-factor for Identification of a Spherical Conductor Submerged in Soil
    (2018-07-02)
    Yoiyod, P.
    ;
    Pathoumvanh, S.
    ;
    Phongcharoenpanich, C.
    ;
    Krairiksh, M.
    The Unexploded Ordnance (UXO) problem is a barrier plaguing for the country's development since the UXO contamination can render lands unusable. The UXO is defined as a metallic material submerged into the soil. Generally, the clearance team uses a handheld metal detector for scanning sub-surface and sensing the location of such a bomb. This outdated method is labor intensive and time consuming when scanning in the large area. Hence, the high-speed and lightweight scanning system for sensing underground object is desired. This paper investigated a feasibility to develop a Ground Penetrating Radar (GPR) system that can detect metallic bombs which is submerged in soil at the depth of 30 cm from the surface. The scattered waves from an object were calculated at different positions and the Rician k-factor was estimated from the ratio of mean to variance. The position with highest k-factor indicates the location of the target UXO.
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    A reflectometer using antenna mixers
    (2016-03-07)
    Inrun, R.
    ;
    Vichianchai, R.
    ;
    Leekul, P.
    ;
    Kittiyanpunya, C.
    ;
    Krairiksh, M.
    This paper presents a sensor for monitoring moisture content of paper. The reflection coefficient of paper at various moisture contents are measured and used for determining humidity of paper. The resultant IF output of 50 MHz from the reflectometer operating at the frequency of 2.40 GHz and 2.45 GHz shows an obvious difference in reflection coefficient for dry and wet paper depicting the feasibility to design a moisture content sensor.
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    Microwave vector reflectometer using self-mixing oscillator antennas
    (2015-01-01)
    Yoiyod, P.
    ;
    Krairiksh, M.
    This paper presents a microwave reflectometer using self-mixing oscillator antennas. A unique characteristic of the proposed reflectometer is its simple structure without a circulator and a directional coupler. Each self-mixing oscillator antenna utilizes a Gunn diode as an active device and a rectangular waveguide as a resonator and a radiator. The determination of dielectric properties of materials was carried out at 9.79 GHz and the measured results using the proposed reflectometer were in good agreement with those by a dielectric probe. In addition, the reflectometer has several industrial applications, e.g. fruit classification, moisture content sensing, etc.
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    Analysis of a cost-effective remote sensing system for fruit monitoring
    (2013-12-01)
    Yoiyod, P.
    ;
    Krairiksh, M.
    This paper presents an analysis of a cost effective remote sensing system for monitoring ripeness of mango. The dielectric property of peel and pulp at various maturity stages are measured and used for determining dielectric property of pulp of mango from the measured reflection coefficient. The results show the suitable operating frequency is in the range 6-18 GHz. An obvious difference in reflection coefficient for unripe and ripe mangoes exhibited the possibility to design a cost effective system. © 2013 IEEE.