Cheypoca, Thepjit

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Cheypoca, Thepjit
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thepjit.ch@kmitl.ac.th

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    Item type:Publication,
    OTA-based capacitance-to-period converter for capacitive sensors
    (2013-03-28)
    Kanjanapart, Naratorn
    ;
    Cheypoca, Thepjit
    ;
    Riewruja, Vanchai
    ;
    Petchmaneelumka, Wandee
    A simple design technique for realization of a capacitance-to-period converter based on operational transconductance amplifiers (OTAs) is presented in this paper. The proposed principle utilizes the behavior of astable multivibrator. The configuration of converter is implemented using commercial available and low cost devices. The obtained time period is proportional to sensing capacitance. The conversion gain of proposed scheme can be changed by electronic means. Circuit performances verified by experimental results are agreed with the expected values. © 2013 ICIC International.
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    Item type:Publication,
    System development for orange surface defect detection using image processing
    (2015-01-01)
    Rerkratn, Apinai
    ;
    Cheypoca, Thepjit
    ;
    Kaewpoonsuk, Anucha
    ;
    Kamsri, Thawatchai
    This paper presents system development for orange surface defect detection using image processing. The proposed system consists of conveyer belt, Ultraviolet (UV) lamp, CCD Camera, electronic circuits, interface card and computer. K-means clustering and thresholding techniques are used for inspection of surface defect. The image segments are employed to calculate area of surface defect. The experimental results show that the proposed system can be detection of surface defect.