Influence of the electrodes configuration on a differential capacitive rain sensor performances

Temperature influence on a differential capacitive rain sensor performances

“…This increase could be troublesome since a 10 • C temperature variation has the same effect on C 1 behavior as a 4.2 l rain drop at room temperature [3]. Curve 4(b) reveals capacitances balance in dry condition whatever the temperature.…”

“…Imbalance between C 1 and C 2 reveals the presence of water on the sensor. Due to a specific geometric configuration formerly determined by numerical simulation [3], the field lines generated by the coplanar electrodes diverge largely from the electrodes plane in C 1 , while they are mainly kept within the insulator layer in the case of C 2 . Thus, the dielectric volume under electric field influence in C 1 is composed partly of glass (ε glass ≈ 8), partly of air (ε air = 1) and, when water lies on the sensor, partly of water (ε water = 80).…”

“…In a previous work [3], the sensor dimensioning was numerically performed at room temperature at the chosen frequency of 1 kHz to obtain both:…”

“…The performances of the sensor have been experimentally validated at room temperature [3], however, temperature variations generate modifications on sensor materials properties which can affect the capacitances. The differential mode is believed to reduce such undesirable influences if C 1 and C 2 are subject to the same variations.…”

Proximity Capacitance Array Sensor Based on Data Aggregation Strategy for Rainfall Detection

“…(15)(16)(17)(18)(19) Several scholars have optimized capacitive rainfall sensors. In 2010, Nan Li et al developed a new proximity capacitive sensor design for an automatic car wiper control system, but the authors did not conduct follow-up research on the measurement system, and no sensor application was demonstrated.…”