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Sensors 2017, 17(3), 517;

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

Hannover Centre for Optical Technologies, Leibniz University Hannover, Nienburger Straße 17, 0167 Hannover, Germany
Institut für Mikrosystemtechnik - IMTEK, Chemistry and Physics of Interfaces, University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany
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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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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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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