대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)
- 대한전기학회 1998년도 추계학술대회 논문집 학회본부 C
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- Pages.764-766
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- 1998
저잡음화 계측회로에 의한 다음극형 용존산소센서의 산소투과특성
Oxygen Permeability Characteristics of the Multi-Cathode Type Dissolved Oxygen Sensor Using the Low Noise Measuring Circuit
- Rhie, Dong-Hee (Univ. of Suwon) ;
- Kim, T.J. (Univ. of Suwon) ;
- Kim, Y.H. (Korea Univ.) ;
- Sung, Yung-Kwon (Korea Univ.)
- 발행 : 1998.11.28
초록
An evaluation method for oxygen permeable characteristics of the membrane covering to each cathode of multiple cathode - single anode type dissolved oxygen sensor, which has high reproducibility and is capable of measuring multiple components in solutions. For this purpose, a measuring circuit for the multiple cathode type DO sensor was designed to lower the noise signal by adapting a digital LPF to readout the sensor output accurately. Digital LPF is designed by setting up the transfer function to set the cutoff frequency to 10Hz, and the transfer function is programmed by C language, and then the filtering characteristics are evaluated with the simulation and experiments. Using this LPF added measuring circuit for the multiple cathode type DO sensor, we have obtained the calibration factor for each cathode to calibrate the variation of the output signals. The calibration factor was obtained by measuring the sensor output signal followed by oxygen partial pressure, using the same oxygen permeable membrane at each cathode of the multiple cathode type DO sensor.
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