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김남태(Namtae Kim),이승환(Seunghwan Lee),송한정(Hanjung Song),이응선(Eungsun Lee),유승교(Seoungkyo Yoo) 대한전기학회 2010 정보 및 제어 심포지엄 논문집 Vol.2010 No.10
Detector design is presented for the measurement of liquid conductivity. which can be applied to the air monitoring in a fabrication process of semiconductor chips and the level detection of water contamination. A conductivity detector is designed so that it can apply an AC reference signal to a conductance test cell and synchronously detect an output signal from the cell by a lock-in amplifier. A lowpass filter after the amplifier extracts a DC component of an amplifier output proportional to the liquid conductivity in the cell. Measured results of an experimental detector are in close agreement with the predicted results. Its linearity is shown to approach to that of a commercially available conductivity detector.