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Proceedings 2017, 1(4), 361;

Portable SAW Impedance Sensor Using a 1-Port Resonator Approach

Institute of Materials in Electrical Engineering 1, RWTH Aachen University, 52074 Aachen, Germany
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
Author to whom correspondence should be addressed.
Published: 11 August 2017
(This article belongs to the Proceedings of Eurosensors 2017)
PDF [374 KB, uploaded 13 October 2017]


All actually used SAW sensors have in common that they analyze the transmission characteristics of propagating SAWs. Here, a portable device using the SAW-based impedance sensor type based on one interdigital transducer (IDT) simultaneously as SAW generator and sensor element (1-port approach) is presented. The input port reflection coefficient S11 is measured at the IDT instead of the commonly used S21 transmission forward gain parameter. As a novelty, the so far required expensive vector network analyzer (VNA) is replaced by a hand-held device to measure the impedance spectrum of the SAW sensor by RF-gain-phase meters. The pivotal aspect of the portable system is the transfer of the sophisticated high frequency approach into a quasi-static one. This enables the use of simple lumped electronics without the need of impedance matching circuits. Proof-of-concept was carried out by measuring conductivities of phosphate-buffered solutions (PBS) and viscosities of glycerin. Sensitivities for conductivity of 64 Hz/S cm−1 and for viscosity of 122 mΩ/mPas were obtained, respectively.
Keywords: SAW sensor; impedance; S11 parameter; microfluidics SAW sensor; impedance; S11 parameter; microfluidics
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Nguyen, V.H.; Peters, O.; Serve, S.; Schnakenberg, U. Portable SAW Impedance Sensor Using a 1-Port Resonator Approach. Proceedings 2017, 1, 361.

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