Hydrogel on a split-ring resonator soil water content sensing using swelling characteristics
Fumiya NOTO, Soma Sato, Hiroaki Onoe, Tetsuo Kan · The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) · 2024
In recent years, with the development of smart agriculture, the demand for remote sensing technology that does not require a power source is increasing. Therefore, in this study, we used a split ring resonator (SRR), which is a metamaterial structure composed of minute metal structures that exhibits resonance at a specific frequency, as a sensor probe to remotely measure soil moisture content over a wide area. We created a possible device. This device coats SRR with a swellable hydrogel that absorbs and retains water, and detects the amount of water in the soil from the shift in resonance frequency caused by the swelling of the hydrogel. In this study, we aimed to detect the shift of resonant frequency on the soil surface.