Development and Application of the Single-Spiral Inductive-Capacitive Resonant Circuit Sensor for Wireless, Real-Time Characterization of Moisture in Sand

Figure 7

The change in the sensor’s resonant frequency as a function of decreasing water content in sand samples. Note that the 𝑥 axis of the plot is the water content in sand (0 means no water in sand), as opposed to the 𝑦 axis of Figure 5, which is the decrease in water content from the saturation level (0 means maximum water in sand).