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Sensors 2017, 17(3), 517; doi:10.3390/s17030517

PDMAA Hydrogel Coated U-Bend Humidity Sensor Suited for Mass-Production

1
Hannover Centre for Optical Technologies, Leibniz University Hannover, Nienburger Straße 17, 0167 Hannover, Germany
2
Institut für Mikrosystemtechnik - IMTEK, Chemistry and Physics of Interfaces, University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany
3
Institute for Measurement and Automatic Control, Leibniz University Hannover, Nienburger Straße 17, 30167 Hannover, Germany
*
Author to whom correspondence should be addressed.
Academic Editors: Stefan Bosse, Ansgar Trächtler, Klaus-Dieter Thoben, Berend Denkena and Dirk Lehmhus
Received: 14 November 2016 / Revised: 28 February 2017 / Accepted: 2 March 2017 / Published: 4 March 2017
(This article belongs to the Special Issue System-Integrated Intelligence and Intelligent Systems)
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Abstract

We present a full-polymer respiratory monitoring device suited for application in environments with strong magnetic fields (e.g., during an MRI measurement). The sensor is based on the well-known evanescent field method and consists of a 1 mm plastic optical fiber with a bent region where the cladding is removed and the fiber is coated with poly-dimethylacrylamide (PDMAA). The combination of materials allows for a mass-production of the device by spray-coating and enables integration in disposable medical devices like oxygen masks, which we demonstrate here. We also present results of the application of an autocorrelation-based algorithm for respiratory frequency determination that is relevant for real applications of the device. View Full-Text
Keywords: waveguides; polymer optics; planar systems; humidity sensor; evanescent wave sensor waveguides; polymer optics; planar systems; humidity sensor; evanescent wave sensor
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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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Kelb, C.; Körner, M.; Prucker, O.; Rühe, J.; Reithmeier, E.; Roth, B. PDMAA Hydrogel Coated U-Bend Humidity Sensor Suited for Mass-Production. Sensors 2017, 17, 517.

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