한국토양비료학회지 (Korean Journal of Soil Science and Fertilizer)
- 제33권1호
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- Pages.15-23
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- 2000
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- 0367-6315(pISSN)
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- 2288-2162(eISSN)
유전율 토양 수분 쎈서의 콘덴서 특성
Condenser Characteristics of Dielectric Soil Moisture Sensor
- Oh, Yong-Taeg (National Institute of Agricultural Sciences and Technology) ;
- Eorn, Ki-Cheol (National Institute of Agricultural Sciences and Technology) ;
- Jo, In-Sang (National Institute of Agricultural Sciences and Technology) ;
- Shin, Jae-Sung (National Institute of Agricultural Sciences and Technology)
- 발행 : 2000.02.28
초록
비닐 튜브로 절연한 센서 봉을 토양에 박아 콘덴서로 하고, RC 발전식으로 토양의 유전율을 측정하는 수분 센서의 반응 특성을 조사하였다. 출력은 표준 콘덴서에 비교된 상대 카피씨티, C였는데, 이 카파시티의 등가 회로는 병렬로 연결된 기본 카파씨티와 센서 봉 카파씨티인데, 센서봉 카파씨티는 다시 직렬로 연결된 센서봉 절연 튜브 카파씨티와 센서봉 사이 측정 부위 유전율, U에 따라 변하는 카파시티로 구성되어, 아래 반응 수식에 따라 작동하였다.
RC oscillation method was applied to study the condenser characteristics of two metal sticks insulated by vinyl tube and used in the dielectric constant determinations of most soils. Its capacitance as influenced by the contacted ambient materials was measured as relative capacitance of the sensor sticks compared with the standard one on the RC oscillation circuit. According to the equivalent circuit of the sensor stick set, the measured capacitance was composed of a basic capacitance connected in parallel with sensor stick capacitance, which was composed of lineally connected vinyl tube capacitances and the sensing part capacitance. The dielectric constant (U) of the contacted ambient moist soil located in the sensing part around the sticks interrelated with the other parameters as following equation.
키워드