Songsuwankit, Kanoknuch

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Songsuwankit, Kanoknuch
Alternative Name
Songsuwankit, K.
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kanoknuch.so@kmitl.ac.th

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    Item type:Publication,
    Linear-range extension for linear variable differential transformer using triangular signal
    (2018-12-10)
    Petchmaneelumka, W.
    ;
    Koodtalang, W.
    ;
    Songsuwankit, K.
    ;
    Riewruja, V.
    This paper presents a linear range extension technique for the linear variable differential transformer (LVDT). The technique is based on a signal conditioning circuit using the analog lookup table, which provides very high resolution of resulting signal. The analog table which is obtained by the triangular signal generator, which has the frequency equal to the excitation frequency. Meanwhile, the referenced signal is obtained by the comparison between the excitation signal and the output signal of LVDT. It is used to synchronize with the triangular signal. The proposed technique is simply circuit configuration and it can be implemented using available commercial devices. The experiment shows that the performances of the proposed circuit can be extended from the normal operating range of LVDT to the maximum stroke range. In addition, the response time of the proposed techniques can be approximated as half period of the excitation signal.
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    Item type:Publication,
    Linear-range extension for linear variable differential transformer using binomial series
    (2020-01-01)
    Petchmaneelumka, Wandee
    ;
    Songsuwankit, Kanoknuch
    ;
    Tongcharoen, Jakkapun
    ;
    Riewruja, Vanchai
    The linear-range extension technique for a linear variable differential transformer (LVDT) is described in this paper. Generally, the LVDT has a narrow linear operating range caused by its nonlinear transfer characteristic. To extend the linear operating range, the nonlinear behavior of the LVDT must be adjusted. In this paper, the circuit building block providing the LVDT inverse transfer characteristic using binomial series approximation is proposed for linearizing the nonlinear behavior of the LVDT. The third-order inverse transfer characteristic of the LVDT is synthesized from analog multipliers and a difference amplifier comprising an operational amplifier (opamp). All active devices used in this study are commercially available. Therefore, the attraction of the proposed technique is in the simple configuration and low cost, making it suitable for an embedded measurement system. The performance of the proposed technique is discussed in detail. Simulation and experimental results confirming the performance are also included. As a result, the linear range of the commercial LVDT used in this study can be extended more than 500%. The full scale error of the measured value is about 0.23% over the entire operating range.