The dynamic response of a Butterworth low-pass filter in an ac-based electrical capacitance tomography system

Dixiang Chen, Wuqiang Yang, Mengchun Pan

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Low-pass filters (LPFs) are widely used in electronic instruments. While the cut-off frequency and the resonant factor of an LPF are two major parameters for designing it, another important parameter, the dynamic response of the transient process or time delay, is often ignored. However, it is the time delay that affects the data acquisition rate of a system. This paper discusses the design of a Butterworth LPF with consideration of the time delay, which is one of the major limits to the data acquisition rate of an ac-based electrical capacitance tomography system. The step response of the LPF has been investigated by theoretical analysis, simulation and experiment. The influence of the resonant factor, component parameters and the order of the LPF on the time delay are studied. A fourth-order Butterworth LPF has been designed and tested. The experimental results are in agreement with simulation. © 2010 IOP Publishing Ltd.
    Original languageEnglish
    Article number105505
    JournalMeasurement Science and Technology
    Volume21
    Issue number10
    DOIs
    Publication statusPublished - Oct 2010

    Keywords

    • Electrical capacitance tomography
    • Low-pass filter
    • Step response
    • Time delay
    • Transient process analysis

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