P2.7 Study of interdigital electrode structures for the detection of water spray
- 20. GMA/ITG-Fachtagung Sensoren und Messsysteme 2019
2019-06-25 - 2019-06-26
- P2: Messsysteme
- J. Döring, L. Tharmakularajah, K. Krieger - ITEM Universität Bremen (Deutschland)
- 700 - 707
This paper presents a study of interdigital electrode structures suitable for the detection of road surface wetness. The structures are studied by means of the finite element method (FEM) with the aim of analyzing the effect of varying design parameters on the detection of water. A variation of the number of digits on a fixed electrode area shows a trade-off between dynamic range and penetration depth. Furthermore, increasing the ratio of electrode width and distance results in an enhanced signal-to-noise ratio. In addition, the effects of varying the substrate thickness and applying a shield electrode are evaluated. The study of placing a coating layer on the electrode structure shows the significance of the choice of its thickness and permittivity. Finally, simulations with different water drop sizes show the usability of detecting even small amounts of drops and verify the assumptions made before.