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Author: search.filters.author.Krongratana, Viriya

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    Full-duplex star redundant system for visible light communication
    (2017-01-01)
    Tipsuwanporn, Vittaya
    ;
    Chanthosot, Pokpoom
    ;
    Krongratana, Viriya
    ;
    Numsomran, Arjin
    The full-duplex star redundant system of visible light communication (VLC) for indoor utilization was developed by adding an IR transmitter into the slave part and an IR receiver into the master part of the previous system, which had only an LED as the transmitter and a photodiode as the receiver. This development allows the system to be capable to transmit and receive images and audios in addition to mere texts as before. The transmitted data were encoded with the technique of Manchester encoding, and then tested with 3 types of photodiodes namely VBPW24R, FDS10X10, and OSD100-E. The data transmission was backed up with 3 LED modules that were controlled by an Arduino microcontroller in case one of the modules is damaged. Moreover, the system has functionality in notifying users via the status monitor to check when malfunction happens with any module.
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    The application of yaw sensor for measuring carriage system
    (2016-01-24)
    Chinchusak, Wanchai
    ;
    Tipsuwanporn, Vittaya
    ;
    Numsomran, Arjin
    ;
    Krongratana, Viriya
    Laser interferometers have generally been used for the angular measurement of measuring tape calibration systems. Yaw error measurements using a yaw sensor have been carried out to determine the characteristics of yaw errors and analyze the behaviors of the structural guide. The yaw sensor technique is identical to the error compensation used in a measuring tape calibration, and also has some special parameters. However, the yaw error observation period is very short, but it is sufficiently accurate for a carriage yaw sensor. This paper presents the yaw sensor innovation for the measuring carriage application that would be compensated by using yaw error is approximately minimized to 65 arcsec and its repeatability is less than 30arcsec.
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    Star redundant system for visible light communication
    (2016-01-24)
    Tipsuwanporn, Vittaya
    ;
    Chanthosot, Pokpoom
    ;
    Krongratana, Viriya
    ;
    Numsomran, Arjin
    Visible Light Communication (VLC) for indoor use equipped with a Star redundant system, using LED (light emitting diode) light bulbs and photodiodes as data receivers and transmitters, respectively, was developed in this research. The data for the transmission experiment was in a text files format encoded with the Manchester algorithm. White-light LEDs were used. This system was tested with three types of photodiodes namely VBPW24R, FDS10×10, and OSD100-E. The data was backed up with 3 redundant control sets of LED modules. Arduino UNO R3 microcontroller was used in a case that one module is damaged. Via its USB port (Universal Serial Bus port), the system can also be connected to other devices such as smart phones and computers. Moreover, its monitor can display useful information about its operation as well as notifications to inform users about any malfunctions happening to a specific module.
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    The developing tool for heat exchanger education in instrumentation engineering
    (2016-01-24)
    Oranpaiboon, Nurawit
    ;
    Krongratana, Viriya
    ;
    Tipsuwanpom, Vittaya
    ;
    Gulpanich, Suphan
    The purpose of this paper is to find out the method for constructing heat exchanger model that is a mathematical model comparing with balance energy technique. Firstly, the energy balance applies energy laws for calculating energy between hot and cold side of temperature which is the energy of input equal to energy of output and the result of this process is the outcome temperature would increase further to energy power that heater provides from hot side of heat exchanger. Secondly, Mathematical Model is related to using equations of thermal and finding transferred functions of system and variables of heat exchanger and simulation for responding viewing of output temperature. Finally, this project about energy balance and Mathematical Model would help some other plants in building plant model and calculating energy of system. The result of this method would help to compare between energy balance method and Mathematical Model and results outcome of both.
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    The measurement uncertainty evaluation of a reversal error for the ALSM
    (2015-12-23)
    Chinchusak, Wanchai
    ;
    Tipsuwanporn, Vittaya
    ;
    Krongratana, Viriya
    Most recently, the measurement uncertainty evaluation employs entirely for evaluating the measurement process which is also use to investigate the residual error of length measuring system. This paper presents the measurement uncertainty of the reversal errors that would be compensated by using the error with the measurement uncertainty compensation module. The confident level of measurement uncertainty is approximately 95%. This evaluation result of the measuring system errors were approximately minimized to 8.0 μm.
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    The indoor use development for visible light communication
    (2015-01-01)
    Chanthosot, Pokpoom
    ;
    Tipsuwanporn, Vittaya
    ;
    Krongratana, Viriya
    ;
    Lilawatthananun, Thanaporn
    The technology of visible light communication (VLC) for indoor use has LED and photodiode as two main components. Despite many advantages, VLC has a major problem regarding the short distance of effective communication due to limited power of the emitted light from LED. This study aims to improve effectiveness of VLC by increasing its distance of wireless data communication when used indoor. The method was based on using white LED Array. The operational results at different distances were presented by using UART as the connection interface between the transmitter and the receiver. This research was successful in increasing the maximum data transmission distance of VLC to be up to 400cm. The type of photodiode that enabled this success was OSD-IOOE Photodiode.