Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Sascha Liehr"'
Publikováno v:
Proceedings, Vol 15, Iss 1, p 30 (2019)
We introduce wavelength-scanning coherent optical time domain reflectometry (WS-COTDR) for dynamic vibration sensing along optical fibers. The method is based on spectral shift computation from Rayleigh backscatter spectra. Artificial neural networks
Externí odkaz:
https://doaj.org/article/79cad44d33474e419a3cb886485cdfb8
Publikováno v:
Sensors, Vol 18, Iss 11, p 3952 (2018)
In this paper perfluorinated graded-index polymer optical fibers are characterized with respect to the influence of relative humidity changes on spectral transmission absorption and Rayleigh backscattering. The hygroscopic and thermal expansion coeff
Externí odkaz:
https://doaj.org/article/22de31d92bfc4e1db37ce4e7bb05c4cb
Publikováno v:
Sensors, Vol 17, Iss 4, p 738 (2017)
Distributed measurement of humidity is a sought-after capability for various fields of application, especially in the civil engineering and structural health monitoring sectors. This article presents a method for distributed humidity sensing along po
Externí odkaz:
https://doaj.org/article/ea4826a6072f476cb54db5ca5528e8cf
Autor:
Florian Fricke, Marcelo Brandalero, Sascha Liehr, Simon Kern, Klas Meyer, Stefan Kowarik, Robin Hierzegger, Stephan Westerdick, Michael Maiwald, Michael Hubner
Publikováno v:
IEEE Transactions on Emerging Topics in Computing. 10:87-98
Autor:
Simon Kern, Javier Hoffmann, Stephan Westerdick, Florian Fricke, Michael Hübner, Marcelo Brandalero, Michael Maiwald, Safdar Mahmood, Sascha Liehr, Klas Meyer, Stefan Kowarik
Publikováno v:
DATE
Mass Spectrometry (MS) and Nuclear Magnetic Resonance Spectroscopy (NMR) are critical components of every industrial chemical process as they provide information on the concentrations of individual compounds and by-products. These processes are carri
Autor:
Sascha Liehr
Publikováno v:
OFC
In recent years, artificial neural networks (ANNs) have been increasingly used to enhance the performance of optical fiber sensors for the distributed measurement of strain and temperature. This paper reviews ANN-based approaches for improved and acc
Autor:
Stefan Kowarik, Michael Maiwald, Lukas Wander, Simon Müller, Martin Bornemann-Pfeiffer, Simon Kern, Sascha Liehr
Publikováno v:
Analytical and Bioanalytical Chemistry
Industry 4.0 is all about interconnectivity, sensor-enhanced process control, and data-driven systems. Process analytical technology (PAT) such as online nuclear magnetic resonance (NMR) spectroscopy is gaining in importance, as it increasingly contr
Autor:
Kentaro Nakamura, Kyriacos Kalli, Sascha Liehr, Heeyoung Lee, Yosuke Mizuno, Antreas Theodosiou
Publikováno v:
Photonics Research. 9:1719
Aging degradation and seismic damage of civil infrastructures have become a serious issue for society, and one promising technology for monitoring their conditions is optical fiber sensing. Glass optical fibers have been predominantly used for the pa
Publikováno v:
Optical Sensors 2019.
We compare four different sensing solutions suitable for distributed fiber optic humidity sensing in per uorinated graded-index polymer optical fibers (PFGI-POFs). Compared to silica fbers, polymer optical fibers over advantageous beneffits including
Publikováno v:
Optics Express. 28:39311
A long distance range over tens of kilometers is a prerequisite for a wide range of distributed fiber optic vibration sensing applications. We significantly extend the attenuation-limited distance range by making use of the multidimensionality of dis