Other Engineering Commons^™

Multiplexed Sensor Array For Accurate Time-Of-Wetness (Tow) Measurement, Nathaniel G. Sutton, Hongbo Cong, Jiang John Zhe, Shengxi Li, Xiaoliang Zhu

Williams Honors College, Honors Research Projects

In this work, we use electrochemical impedance spectroscopy (EIS) to observe the response of a single, photo-lithographically created, interdigital transducer (IDT) sensor, dimensions 6mm X 6 mm, with capacitive elements 70μm X 500 nm. The IDT was exposed to different wetting conditions, droplets of DI water, 0.1 M NaCl, and 0.6 M NaCl, in volumes of 0.1, 0.3, 1, and 5 μL. Deliquescence of solid NaCl salt particles in a dynamic-humidity (%RH Increasing, 33% to 85%) atmosphere is examined. Equivalent circuit fitting of impedance spectra suggests linear trends for the capacitive equivalent circuit element parameters and a decaying logarithmic trend …