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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Bergmann, Alexander
Graz University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2024Comparative analysis of fabrication techniques for sensing windows on silicon nitride waveguide platforms
- 2024Millimeter Wave Metamaterial-based Strain Sensor Concept
- 2023Large-scale automated emission measurement of individual vehicles with point samplingcitations
- 2022Humidity Responsive Reflection Grating Made by Ultrafast Nanoimprinting of a Hydrogel Thin Filmcitations
- 2021Silicon Nitride Photonic Particle Detector-Experiments and Model Assessmentcitations
- 2020Vacuum-Assisted Selective Adhesive Imprinting for Photonic Packaging of Complex MOEMS Devicescitations
- 2020Fast optical humidity sensor based on nanostructured hydrogels
- 2019Vacuum-assisted selective adhesive imprinting for heterogeneous system integration of MOEMS devices
- 2019Fast Optical Humidity Sensor Based on Hydrogel Thin Film Expansion for Harsh Environmentcitations
- 2019State Estimation Approach of Lithium-Ion Batteries by Simplified Ultrasonic Time-of-Flight Measurementcitations
- 2018First Steps towards a Super-Compact in-situ Laser-Induced-Incandescence Sensor System
- 2017Modelling chemical degradation of ionomer in a polymer electrolyte fuel cell
- 2004Interpretation of small-angle scattering data of inhomogeneous ellipsoidscitations
- 2004Small Angle X-Ray Scattering with Cobalt Radiation for Nanostructure Characterization of Fe-Based Specimen
- 2000Evaluation of small-angle scattering data of charged particles using the generalized indirect Fourier transformation techniquecitations
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article
Fast Optical Humidity Sensor Based on Hydrogel Thin Film Expansion for Harsh Environment
Abstract
With the application of a recently developed deposition method called initiated chemical vapor deposition (iCVD), responsive hydrogel thin films in the order of a few hundred nanometers were created. When in contact with humid air, the hydrogel layer increases its thickness considerably. The measurement of the thickness change was realized interferometrically with a laser and a broadband light source in two different implementations. The relative change in thickness with respect to humidity can be described with the Flory–Huggins theory. The required Flory–Huggins interaction parameter was determined for the actual hydrogel composition. The setup was designed without electric components in the vicinity of the active sensor layer and is therefore applicable in harsh environments such as explosive or corrosive ones. The implemented sensor prototype delivered reproducible relative humidity ( RH ) values and the achieved response time for an abrupt change of the humidity τ63≤2.5 s was about three times faster compared to one of the fastest commercially available sensors on the market.