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Author: search.filters.author.Manyanon, Apinan

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    The analysis of cause from fusion splice in single mode optic fiber for reducing splicing loss between fusion splicing
    (2003-01-01)
    Jumpates, Ashira
    ;
    Leepila, Ruchaneeya
    ;
    Manyanon, Apinan
    ;
    Noppanakeepong, Suthichai
    This article is study on loss from fusion splice for single mode optic fibers from any errors in order to find out the actual loss cause. The loss from hsion splicing is compared with the loss obtained from simulation. The result can predict the error caused by firsion splicing. It will be an actual error at junction, so fusion splicing loss of fiber optic can be reduced. Sometimes, the technician just notices that fusion splicing has some loss but he does not know the actual cause. Researcher want to find out and prepare the Microsoft access program for checking Ioss and cause from any errors. It will be useful for the technician to train and to decrease any errors from fusion splice. The heat to be radiated from fusion splice and parameters of b i o n splice are important to be considered. The comparison involves the development of optic fiber to the gateway of data high speed. This simulation is. technically easy and can do actual performance and can be adapted to telecommunications system.
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    Rain rate estimation by simplified method using UHF wind profiler measurement at KMITL
    (2000-01-01)
    Somboonlarp, Chaiwat
    ;
    Leelaruji, Nipha
    ;
    Hemmakorn, Narong
    ;
    Manyanon, Apinan
    ;
    Ohno, Yuichi
    In this paper, we propose a simplified method for rain rate estimation only using simple parameters instead of the fitting or retrieval calculation using data of UHF wind profiler measurement, which operated by King Mongkut's Institute of Technology Ladkrabang (KMITL) in Bangkok, Thailand. The simple parameters in this method use only the peak position of rain echo and Doppler velocity of clear air echo from Doppler spectral for estimated rain drop size distribution (DSD), which more important to calculate rain rate. Doppler spectra of UHF wind profiler at KMITL during the rainy season are used for testing the availability of this simplified rain estimation method. Rough agreement between rain rate estimation from the surface rain gauge and UHF wind profiler at KMITL can be seen at the range of low rain rate. At the range of high rain rate, the estimation by this method does not correspond to the surface rain gauge since the Doppler spectra seems saturated with too strong rain echo.
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    Lower atmospheric wind observation by L-band Doppler radar in Thailand
    (2000-01-01)
    Leelaruji, Nipha
    ;
    Somboonlarp, Chaiwat
    ;
    Sangonchat, Parichart
    ;
    Hemmakorn, Narong
    ;
    Manyanon, Apinan
    The study of low atmospheric boundary layer wind by wind profiler radar is the aim of this present. The L-band Doppler radar used as the meteorological equipment using operating frequency 1357.5 MHz. The transmitter radiates the pulse signal of peak power 1 kW through the upper air. The single parabolic antenna is steering into three directions, vertical, north and east respectively. This radar received the echo scattered back by the irregularity of atmospheric refractivity along the beam. The Doppler shift frequency deviates by the movement of turbulent are used to calculate the wind velocity and wind direction. The observation height starts from 150 meters to 4 km. The diurnal and seasonal wind had been observed for six years continuously. It shows the variation of wind in each year, which correspond to Asia monsoon, Northeastern monsoon and Southwestern monsoon. While the radio sonde, which operates by radio propagation technique is used for wind measurements too. The comparisons of both systems are present in correlation method.
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    Total ionospheric electron content observation and ETS-V beacon experiment for studying GHz-band scintillation in the equatorial zone
    (1997-01-01)
    Igarashi, K.
    ;
    Nagayama, M.
    ;
    Ohtani, A.
    ;
    Hamamoto, N.
    ;
    Hashimoto, Y.
    A L-band CW-beacon experiment using ETS-V satellite for mobile satellite communications experiments was made with the small satellite ground stations installed at Fiji, Indonesia, Papua New Guinea, Thailand and Japan in order to study propagation effects on satellite-to-ground-links in the equatorial zone. GPS observations of total ionospheric electron content and monitoring of geomagnetic variations were started at the same ground stations in Bandung, Indonesia and Bangkok, Thailand from November, 1993. During the severe ionospheric disturbances on February 22, 1994 Japanese Broadcasting Satellite BS-3a stopped its broadcasting for about one hour by an unexpected satellite trouble. We focused on this event by comparing between TEC observed in low-latitude and mid-latitude of northern hemisphere. The cause of this sattelite trouble is supposed mainly by the electric static discharge (ESD) in the satellite. The severe geomagnetic storm on 21 February, 1994 is related in this paper as one of the cause for this satellite trouble. ©1997 COSPAR. All rights reserved.