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Author: search.filters.author.Keawpoonsuk, AnuchaHas files: No

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    Simple vector summation circuit using opamps
    (2011-01-01)
    Kamsri, Thawatchai
    ;
    Julsereewong, Amphawan
    ;
    Keawpoonsuk, Anucha
    ;
    Petchmaneelumka, Wandee
    ;
    Riewruja, Vanchai
    This paper presents a vector summation circuit using operational amplifiers (opamps) for multiple voltage inputs. The implementation method based on the opamp supply-current sensing utilizes an inherently quadratic characteristic of the opamp class-AB output stage. The distinguishing features of the proposed implementation are simple configuration and low cost. Experimental results verifying the performances of the proposed vector summation circuit are included. © 2011 SICE.
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    High current low frequency eddy current imaging system
    (2007-12-01)
    Rerkratn, Apinai
    ;
    Pulkham, Jirayut
    ;
    Chitsakul, Kitiphol
    ;
    Sangworasil, Manas
    ;
    Keawpoonsuk, Anucha
    Eddy current technique plays an important role in non destructive test. Based on the principal of electromagnetism. We introduce, in this paper our new eddy current imaging system for flaw detection in aluminium plate. The propose system using high current and low frequency with single coil. Results of some preliminary experiments have been shown satisfy sensitivities, resolution and stability of the proposed system. © ICROS.