Optimizing Transducer Configuration of Capacitive Sensors for Agricultural Applications

N. Stroia[1], D. Moga[1], G. Mocanu[1], Z. Barabas[1], R. Moga [2]
[1]Technical University of Cluj-Napoca, Cluj-Napoca, Romania

This work aims to determine optimized configuration using COMSOL Multiphysics® for a class of transducers. Two types of capacitive sensors needed for monitoring and control in agriculture are investigated: a rain sensor and a soil humidity sensor. COMSOL Multiphysics® is used to test various configurations for both transducers, like the number of teeth in the comb, the depth of the teeth, the thickness of the covering glass, the relative permittivity of the glass in the case of the rain sensor, and the distance between the electrodes, electrodes lengths and diameters as well as the type of the covering polymer. The measurements from prototypes were in excellent agreement with those obtained through the COMSOL Multiphysics® simulations.