논문 국내 국내전문학술지(KCI급) Refractive index-based soil moisture sensor
- 학술지 구분 국내전문학술지(KCI급)
- 게재년월 2021
- 저자명 Eun-Seon Sim, Su-Bin Hwa, Ik-Hoon Jang, Jun-Hee Na, and Min-Hoi Kim
- 학술지명 Journal of Sensor Science and Technology
- 발행처명 KoreaScience
- 발행국가 국내
- 논문언어 외국어
- 전체저자수 6
홈페이지논문 초록 (Abstract)
We developed a highly accurate, yet inexpensive, refractive index (RI)-based soil moisture sensor. To detect the RI, a light guide was set with a light-emitting diode and photodiode. When the air fills the space between the soil particles, most of the incident light is reflected at the interface between the waveguide and the air because of the large RI difference. As the moisture of the soil increases, the macroscopic soil RI increases. This allows incident light to pass through the interface. The intensity of the light reaching the photodiode was simulated according to the change in the soil RI. Using the simulation results, we designed and manufactured a curved glass waveguide. We evaluated the performance of the RI-based soil sensor by comparing it with a commercially available, high-cost and high-performance time-domain reflectometer (TDR). Our sensor was 96% accurate, surpassing the costly TDR sensor.