@inproceedings{DenglerVinogradovZiemannetal.2021, author = {Dengler, Simon Andreas and Vinogradov, Juri and Ziemann, Olaf and Engelbrecht, Rainer and Schmauß, Bernhard}, title = {Low Cost POF OTDR Reaches 200 m Sensing Distance}, volume = {2021}, publisher = {The International Committee on Polymer Optical Fibers, ICPOF}, address = {Jinhua City}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:92-opus4-26577}, pages = {13}, year = {2021}, language = {en} } @inproceedings{VinogradovMorfDengleretal.2021, author = {Vinogradov, Juri and Morf, Fabian and Dengler, Simon Andreas and Engelbrecht, Rainer and Ziemann, Olaf}, title = {FPGA and APD Based Optical Time Domane Reflectometry in Sensor Applications}, series = {The 28th International Conference on Plastic Optical Fibers 2019-11-20}, booktitle = {The 28th International Conference on Plastic Optical Fibers 2019-11-20}, year = {2021}, abstract = {This paper shows an optical time domain reflectometry (OTDR) system based on an avalanche photodiode (APD) receiver, a 520 nm laser diode transmitter, a high-speed analog-to-digital converter (ADC) and a commercially available field programmable gate array (FPGA). This approach allows OTDR measurements up to 200 m and provides a spatial resolution of 20 cm. Depending on the number of averaging, the measurement time can be between 5 s and 50 s for a range up to 200 m with a good signal to noise ratio.}, language = {en} } @inproceedings{VinogradovKruglovWetzeletal.2024, author = {Vinogradov, Juri and Kruglov, Roman and Wetzel, Ulrich and Engelbrecht, Rainer and Ziemann, Olaf}, title = {200 m Gigabit POF Link Based on 520 nm Laser Diode and PAM Media Converter}, series = {International Conference on Plastic Optical Fibers}, volume = {Proceedings 2024}, booktitle = {International Conference on Plastic Optical Fibers}, year = {2024}, abstract = {This paper shows the results on the data transmission over distances of up to 350 m SI-POF with KDPOF Media Converter based on Gigabit POF Transceiver KD1001 (KD-EVK1001MC Evaluation Kit) and laser diode (LD) operating at 520 nm. A bit rate of 1 Gbit/s with 16-PAM modulation scheme can be achieved over 200 m SI-POF. At longer distances, the bit rate is automatically reduced by KDPOF transceiver according to the actual channel capacity.}, language = {en} } @inproceedings{VinogradovKruglovZiemannetal.2024, author = {Vinogradov, Juri and Kruglov, Roman and Ziemann, Olaf and Engelbrecht, Rainer}, title = {Incoherent OFDR System for Distances up to 200 m SI-POF}, series = {International Conference on Plastic Optical Fibers ; Proceedings 2024}, booktitle = {International Conference on Plastic Optical Fibers ; Proceedings 2024}, year = {2024}, abstract = {We report on a proposal for an incoherent optical frequency domain reflectometry (I-OFDR) for 1-mm core diameter PMMA SI-POF. An avalanche photodiode receiver and optimized transmitter based on a 515-nm laser diode allow measurement up to 200 m SI-POF. The measurements have been carried out using a vector network analyzer; the subsequent data processing has been implemented in MATLAB.}, language = {en} } @inproceedings{DenglerRoseeuGonzalezLuberetal.2022, author = {Dengler, Simon Andreas and Roseeu Gonzalez, R. V. and Luber, M. and Ziemann, Olaf and Engelbrecht, Rainer and Schmauss, B.}, title = {Performance Evaluation of Reference Reflections in Polymer Optical Fibers for Strain Sensing}, series = {27th International Conference on Optical Fiber Sensors}, booktitle = {27th International Conference on Optical Fiber Sensors}, publisher = {Optica Publishing Group}, address = {Washington, D.C.}, isbn = {978-1-957171-14-2}, doi = {10.1364/ofs.2022.tu2.6}, year = {2022}, abstract = {We present a robust concept for quasi distributed strain measurement using optical time domain reflectometry (OTDR) in polymer optical fibers (POF). The spatial shifts of discrete reflective events in the OTDR trace are evaluated as reference points. It is shown how such reference reflections can be prepared and which properties can be expected.}, language = {en} } @inproceedings{DenglerSchmidtLuberetal.2021, author = {Dengler, S. and Schmidt, N. and Luber, M. and Fischer, J. and Ziemann, Olaf and Engelbrecht, Rainer and Hangen, H.}, title = {B8.3 Influence of Temperature on Distributed Strain Sensing with OTDR in Polymer Optical Fibers}, series = {SMSI 2021 - Sensors and Instrumentation}, booktitle = {SMSI 2021 - Sensors and Instrumentation}, publisher = {AMA Service GmbH, Von-M{\"u}nchhausen-Str. 49, 31515 Wunstorf, Germany}, isbn = {978-3-9819376-4-0}, doi = {10.5162/smsi2021/b8.3}, pages = {155 -- 156}, year = {2021}, abstract = {Strain in ground and earthworks can be measured by polymer optical fibers (POF) applied to geotextiles. We measure the increase of backscatter (IOB) in the fiber under strain using optical time domain reflectometry (OTDR). The effect of temperature on this measurement principle is investigated. The local backscatter changes by 0.003 dB/K for common ambient temperature. In addition it is shown, that temperature depended viscoelastic properties of the polymer does affect IOB.}, language = {en} } @inproceedings{DenglerLuberNeffetal.2023, author = {Dengler, Simon Andreas and Luber, Michael and Neff, L{\´e}on and Hangen, Hartmut and Schmauss, Bernhard and Ziemann, Olaf and Engelbrecht, Rainer}, title = {OTDR Strain and Force Sensing by POF on Geotextiles in a Geotechnical Application Test}, series = {28th International Conference on Optical Fiber Sensors}, booktitle = {28th International Conference on Optical Fiber Sensors}, publisher = {Optica Publishing Group}, address = {Washington, D.C.}, isbn = {978-1-957171-30-2}, doi = {10.1364/OFS.2023.W4.91}, year = {2023}, abstract = {With polymer optical fibers (POF) attached to geotextiles, optical time domain reflectometry (OTDR) can be used to measure strain of the geotextile spatially resolved in soil. We test the technique in a geotechnical application test and thus demonstrate the functionality of the sensor for field use.}, language = {en} } @misc{DenglerKaefferleinEngelbrechtetal.2023, author = {Dengler, Simon Andreas and K{\"a}fferlein, Tilmann and Engelbrecht, Rainer and Schmauss, Bernhard and Ziemann, Olaf}, title = {Dependence of POF End Surface Reflectivity on Surface Roughness}, series = {Proceedings POF2023}, journal = {Proceedings POF2023}, year = {2023}, language = {en} } @article{WeilandSchiebahnReisgenetal.2023, author = {Weiland, Josef and Schiebahn, Alexander and Reisgen, Uwe and Luber, Michael and Ziemann, Olaf and Engelbrecht, Rainer}, title = {Zustands{\"u}berwachung struktureller Klebungen unter Scherbeanspruchung durch Integration einer optischen Polymerfaser}, series = {Schweißen und Schneiden}, journal = {Schweißen und Schneiden}, number = {8}, publisher = {DSV Media}, address = {D{\"u}sseldorf}, pages = {542-547}, year = {2023}, abstract = {Das im hier vorgestellten Forschungsrojekt KlebPOF untersuchte Sensorkonzept der Zustands{\"u}berwachung von Klebungen basiert auf der Integration eines Kunststoff-Lichtwellenleiters (polymere optische Faser, POF) in die Klebung. Die {\"a}hnlichen mechanischen Eigenschaften von POF und Klebstoff, beides Kunststoffe, haben zur Folge, dass Beanspruchungen des Klebstoffs auf die POF {\"u}bertragen werden. Die Auswirkungen einer Belastung auf die optischen Eigenschaften des Lichtwellenleiters werden in Bezug auf die transmittierte Lichtleistung sowie auf den Einfluss der Winkelverteilung der aus der Faser austretenden Lichtstrahlen im Fernfeld untersucht und f{\"u}r den Einsatz zur Zustands{\"u}berwachung von Klebverbindungen interpretiert. Die Ergebnisse an Couponproben zeigen, dass sich die Methode insbesondere f{\"u}r semi-strukturelle Klebstoffe, wie zum Beispiel 2K-Polyurethane oder 2K-Methylmethacrylate und eine Beanspruchung der Klebung auf Scherung gut eignet. In den Untersuchungen an dem Funktionsmuster, einer Rohr-Muffe-Klebung, waren sehr deutliche {\"A}nderungen im Sensorsignal fr{\"u}hzeitig vor Versagen detektierbar. Diese {\"A}nderung konnte mit kosteng{\"u}nstigen opto-elektronischen Komponenten detektiert werden. Damit eignet sich die Methode f{\"u}r eine integrale Zustands{\"u}berwachung der gesamten Klebung ohne Ortsaufl{\"o}sung, um einen kosteng{\"u}nstigen Sensor f{\"u}r den Feldeinsatz zu erm{\"o}glichen.}, language = {de} } @article{FischerSchusterWaechteretal.2018, author = {Fischer, Jakob and Schuster, Timo and W{\"a}chter, Christian and Luber, Michael and Vinogradov, Juri and Ziemann, Olaf and Engelbrecht, Rainer}, title = {Isolated sensor networks for high-voltage environments using a single polymer optical fiber and LEDs for remote powering as well as data transmission}, series = {Journal of Sensors and Sensor Systems}, volume = {7}, journal = {Journal of Sensors and Sensor Systems}, number = {1}, publisher = {Copernicus GmbH}, issn = {2194-878X}, doi = {10.5194/jsss-7-193-2018}, pages = {193 -- 206}, year = {2018}, abstract = {Abstract. Many applications in high voltage or explosive environments require sensors which are electrically isolated from other components of a system. These sensors need remote powering as well as wireless or isolated data transmission links. A possible solution can be based on optically powered optical sensor links. These typically employ four different photonic components: for the data communication a fast LED as a transmitter and a photo diode as a receiver, furthermore for sensor powering a high-power light source and a photonic power converter. Additionally, two optical fibers are required for optical remote powering and the optical data link. In this paper we demonstrate an optically powered optical sensor link using only low-cost high-brightness LEDs and a single polymer optical fiber (POF) for all of these tasks. Coupling efficiencies, power transmission and modulation bandwidths are analyzed for LEDs with different colors. Potentials for many mW of electrical remote powering and Mbit s-1 sensor data links are demonstrated over 10 m of POF. This approach can be used for almost any electronic sensor with moderate power requirements.}, language = {en} } @misc{EngelbrechtLuberVinogradovetal.2024, author = {Engelbrecht, Rainer and Luber, Michael and Vinogradov, Juri and Hemmerlein, Moritz and Pick, Mathias and Ziemann, Olaf}, title = {Field Test Results of a POF Sensor for Crack Detection in Blade Bearings of Wind Turbines}, series = {Proceedings POF2024}, journal = {Proceedings POF2024}, year = {2024}, language = {en} } @misc{EngelbrechtDenglerLuberetal.2023, author = {Engelbrecht, Rainer and Dengler, Simon Andreas and Luber, Michael and Vinogradov, Juri and Ziemann, Olaf}, title = {Condition Monitoring with POF: Recent Progress on Geotextiles and Wind Turbines}, series = {Proceedings POF2023}, journal = {Proceedings POF2023}, year = {2023}, language = {en} } @inproceedings{EngelbrechtLuberVinogradovetal.2025, author = {Engelbrecht, Rainer and Luber, Michael and Vinogradov, Juri and Hemmerlein, Moritz and Pick, Mathias and Ziemann, Olaf}, title = {Range Extension of PMMA POF Sensors Beyond 100 M for Monitoring Large Infrastructures}, series = {33rd International Conference on Plastic Optical Fibers}, booktitle = {33rd International Conference on Plastic Optical Fibers}, pages = {5}, year = {2025}, abstract = {A POF integral length and extension sensor based on phase detection of intensity modulated light with fiber sensor lengths beyond 100 m for monitoring large infrastructures is discussed. A theory for a scaling law of the precision limit over length and modulation frequency is presented. Experimental results using green light for sensor ranges above 100 m are shown.}, language = {en} }