Fabricated sensor structure has dimension of 210 mm x 12 mm and the thickness approximately of 27 μm. It contains 8 digital-like sections along the sensor and one analog section which allows to fine measurements. The sensor was tested in a vessel during filling and emptying with various liquids. Performed tests exhibited the linearity of the sensor characteristic and the lack of hysteresis. Obtained sensitivity of the sensor prototype was approximately 6.8 pF/mm, but it could be easily modify on the design stage due to the fast prototyping feature of inkjet printing technology. Thanks to the flexibility of the substrate, the sensor structure can be applied to any shape of vessel. Furthermore, the sensor construction is fairly simple and costs in mass production could be extremely low. This type of sensor was design especially for autonomous cleaning and washing robots for large areas operation.
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Daniel Paczesny, Grzegorz Tarapata, Michał Marzęcki, Michał Woyke, Ryszard Jachowicz, "The capacitive sensor for liquid level measurement, fabricated with the inkjet printing technology," Proc. SPIE 10161, 14th International Conference on Optical and Electronic Sensors, 1016112 (10 November 2016);