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Eurosensors 2014, Date: 2014/09/07 - 2014/09/10, Location: Brescia, Italy

Publication date: 2014-01-01
Volume: 87 Pages: 1123 - 1126
Publisher: Elsevier

EUROSENSORS 2014, the 28th European Conference on Solid-State Transducers

Author:

Keulemans, Grim
Pelgrims, Patrick ; Bakula, Marko ; Ceyssens, Frederik ; Puers, Robert ; Sberveglieri, G ; Ferrari, V

Keywords:

Strain sensor, PDMS, Microchannel, Ionic liquid, AD5933, Impedance spectroscopy, Science & Technology, Technology, Nanoscience & Nanotechnology, Remote Sensing, Science & Technology - Other Topics, PMDS, 09 Engineering

Abstract:

A novel ionic liquid based strain sensor is fabricated for high strain measurements (up to 10% and higher). A tubular silicone microchannel with a diameter of 310 μm and a length of 5 mm is filled with an ionic liquid (1-Butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide). The final sensor has an outer diameter of 650 μm and a length of 15 mm. When the channel is axially loaded, geometrical deformations change the electrical properties of the liquid channel. 4-point impedance spectroscopy with the integrated circuit AD5933 from Analog Devices and a dedicated galvanostatic front-end is performed to characterize this piezoresistive effect. The highest sensitivity is observed in the frequency range from 10 to 25 kHz, with corresponding gauge factors between 2 and 2.5 for an elongation of 10%.