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Sensors 2019, 19(3), 443; https://doi.org/10.3390/s19030443

Characterization of a Robust 3D- and Inkjet-Printed Capacitive Position Sensor for a Spectrometer Application

1
Institute for Smart System Technologies, Sensors and Actuators Department, Alpen-Adria-Universität Klagenfurt, 9020 Klagenfurt, Austria
2
Carinthia Tech Research AG, High Tech Campus, 9524 Villach, Austria
*
Author to whom correspondence should be addressed.
This paper is an expanded version of “A Robust 3D- and Inkjet-Printed Capacitive Position Sensor in a Spectrometer Application” published in the Proceedings of the EUROSENSORS 2018, Graz, Austria, 9–12 September 2018.
Received: 13 December 2018 / Revised: 4 January 2019 / Accepted: 16 January 2019 / Published: 22 January 2019
(This article belongs to the Special Issue Eurosensors 2018 Selected Papers)
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Abstract

An inkjet- and 3D-printed capacitive sensor system with an all-digital and flexible sensor read-out hardware is reported. It enables spectrometer devices with significantly reduced device outlines and costs. The sensor is developed as multilayer inkjet-printed electrode structure on a 3D-printed copper housing. Very high required position resolutions of r e s p o s < 50 nm and a wide measurement range of r m = 1000 μ m at an offset of d 0 = 1000 μ m in the considered spectrometers motivate this work. The read-out hardware provides high sampling rates of up to r s 10 ns and enables the generation of trigger signals, i.e., the mirror control signal, without a time lag. The read-out circuitry is designed as a carrier frequency system, which enables flexible choices of bandwidth and measurement signal frequency. It thus allows for separation in frequency from coupling parasitics, i.e., other frequencies present in the device under test, and makes the read-out quasi-noise-immune. View Full-Text
Keywords: capacitive sensor; nanometer position measurement; inkjet-printing; 3D-printed metals; additive manufacturing capacitive sensor; nanometer position measurement; inkjet-printing; 3D-printed metals; additive manufacturing
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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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Faller, L.-M.; Lenzhofer, M.; Hirschl, C.; Kraft, M.; Zangl, H. Characterization of a Robust 3D- and Inkjet-Printed Capacitive Position Sensor for a Spectrometer Application. Sensors 2019, 19, 443.

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