TY - JOUR A1 - Prata, A. J. A1 - Dezitter, F. A1 - Davies, I. A1 - Weber, Konradin A1 - Birnfeld, M. A1 - Moriano, D. A1 - Bernardo, C. A1 - Vogel, A. A1 - Prata, G. S. A1 - Mather, T. A. A1 - Thomas, H. E. A1 - Cammas, J. A1 - Weber, M. T1 - Artificial cloud test confirms volcanic ash detection using infrared spectral imaging JF - Scientific reports N2 - Airborne volcanic ash particles are a known hazard to aviation. Currently, there are no means available to detect ash in flight as the particles are too fine (radii < 30 μm) for on-board radar detection and, even in good visibility, ash clouds are difficult or impossible to detect by eye. The economic cost and societal impact of the April/May 2010 Icelandic eruption of Eyjafjallajökull generated renewed interest in finding ways to identify airborne volcanic ash in order to keep airspace open and avoid aircraft groundings. We have designed and built a bi-spectral, fast-sampling, uncooled infrared camera device (AVOID) to examine its ability to detect volcanic ash from commercial jet aircraft at distances of more than 50 km ahead. Here we report results of an experiment conducted over the Atlantic Ocean, off the coast of France, confirming the ability of the device to detect and quantify volcanic ash in an artificial ash cloud created by dispersal of volcanic ash from a second aircraft. A third aircraft was used to measure the ash in situ using optical particle counters. The cloud was composed of very fine ash (mean radii ~10 μm) collected from Iceland immediately after the Eyjafjallajökull eruption and had a vertical thickness of ~200 m, a width of ~2 km and length of between 2 and 12 km. Concentrations of ~200 μg m(-3) were identified by AVOID at distances from ~20 km to ~70 km. For the first time, airborne remote detection of volcanic ash has been successfully demonstrated from a long-range flight test aircraft. KW - Luftreinhaltung Y1 - 2016 U6 - https://doi.org/10.1038/srep25620 VL - 6 PB - Springer Nature ER - TY - PAT A1 - Braun, Alexander A1 - Richwin, Matthias A1 - Weber, Thomas T1 - Optoelektronische Sensoreinrichtung für ein Kraftfahrzeug N2 - Beschrieben wird eine optoelektronische Sensoreinrichtung für ein Kraftfahrzeug zur unterscheidenden Detektion von Feuchtigkeit und Salzlösungen auf einer Fahrzeugscheibe, mit einer Beleuchtungseinheit zur Einstrahlung von Licht in eine Fahrzeugscheibe und mit einem Lichtempfänger, welcher von der Fahrzeugscheibe reflektiertes Licht erfasst, sowie mit einem Koppelelement zur Ein- und Auskopplung von Licht in bzw. aus der Fahrzeugscheibe, wobei die Beleuchtungseinrichtung Licht über einen Einfallswinkelbereich in die Fahrzeugscheibe einstrahlt, der sich über mehrere Winkelgrade erstreckt, wobei der Lichtempfänger eine Vielzahl von Empfangselementen aufweist, wobei ein optisches System das von der Fahrzeugscheibe in einen Ausfallswinkelbereich reflektierte Licht auf Empfangselemente des Lichtempfängers abbildet und wobei der Lichtempfänger ein Signal generiert, aus dem eine Auswertevorrichtung den Grenzwinkel der Totalreflexion an der Fahrzeugscheibe ermittelt. Y1 - 2009 UR - https://depatisnet.dpma.de/DepatisNet/depatisnet?action=bibdat&docid=DE102007052704A1 PB - Deutsches Patent- und Markenamt ER - TY - CHAP A1 - Schäfer, Klaus A1 - Harig, Roland A1 - Blumenstock, Thomas A1 - Höfert, Norbert A1 - Weber, Konradin ED - Picard, Richard H. ED - Schäfer, Klaus ED - Comeron, Adolfo ED - van Weele, Michiel T1 - Development of a VDI guideline for passive FTIR measurements in the atmosphere T2 - Remote sensing of clouds and the atmosphere XV : 21 - 23 September 2010, Toulouse, France KW - Luftreinhaltung Y1 - 2010 U6 - https://doi.org/10.1117/12.866466 SN - 0277-786X VL - 7827 PB - SPIE CY - Bellingham, Wash. ER - TY - CHAP A1 - Weber, Konradin A1 - Fischer, Christian A1 - van Haren, Günther A1 - Krause, Horst A1 - Bunte, Gudrun A1 - Schweikert, Wenka A1 - Härdle, Thomas ED - Schubert, Hiltmar ED - Rimski-Korsakov, A. T1 - Stand-Off Detection of Explosives of Suicide Bombers by Means of Open-Path FTIR Spectroscopy T2 - Stand-Off Detection of Suicide Bombers and Mobile Subjects KW - Luftreinhaltung Y1 - 2006 SN - 9781402051579 U6 - https://doi.org/10.1007/1-4020-5159-X_16 SP - 135 EP - 143 PB - Springer Netherlands CY - Dordrecht ER - TY - CHAP A1 - Weber, Konradin A1 - Vogel, Andreas A1 - Reichardt, Roland A1 - Zimmermann, Thomas ED - Altawell, Najib ED - Konstantin, Volkov ED - Cristina, Matos ED - Fernandez de Arroyabe, Pablo T1 - Research aircraft flight for gas leakage investigation at the Elgin wellhead gas platform in the North Sea – initial results T2 - Recent Researches in Environmental and Geological Sciences KW - Luftreinhaltung KW - Forschungsflugzeug KW - Messtechnik KW - Bohrinsel KW - Leckage KW - Erdgas Y1 - 2012 SP - 240 EP - 243 PB - WSEAS ER - TY - CHAP A1 - Weber, Konradin A1 - Fischer, Christian A1 - Lange, Martin A1 - Pohl, Tobias A1 - Böhlke, Christoph A1 - Wagner, Frank A1 - Mattis, Ina A1 - Flentje, Harald A1 - Sturm, Klaus A1 - Barth, Joachim A1 - Steinkopff, Thomas A1 - Vogel, Andreas T1 - Aircraft measurements compared with ceilometer measurements during a sahara dust period in Germany T2 - Geophysical Research Abstracts: EGU General Assembly 2015 N2 - A significant Sahara dust event took place at the beginning of April 2014 over large areas of Germany and Europe. The German Weather Service (DWD) detected and monitored the expansion and propagation of this dust cloud with a ceilometer network of more than 50 ceilometers. Moreover, these ceilometers were also able to track the altitude of the dust cloud at the positions of the ceilometers. Additionally, aircraft measurements over Germany and France were performed with two aircraft by the Duesseldorf University of Applied Sciences. These aircraft were equipped with optical particle counters (OPC) and were able to measure the particle size distribution within the Sahara dust cloud and as a result of this to calculate the particle mass concentration of the dust. The ceilometer measurements and the aircraft measurements complemented each other: whereas the ceilometers gave continuous information about the Sahara dust cloud at the ceilometer positions, the aircraft measurements delivered interpolating results between the ceilometer positions. Moreover, at several ceilometer positions intercomparison flights were performed by spiraling with the aircraft up or down around the ceilometer laser beam. This gave the unique possibility for comparing the remote sensing results of the ceilometers with the in-situ measurements of the aircraft. This study shows that a significant high amount of Saharan dust particles was transported over Germany during a several days long episode. Furthermore, the intercomparison study between the German ceilometer network and aircraft measurements results shows a good agreement. A combination of these techniques could help to detect the vertical and horizontal distribution of the dust cloud and additionally the particle mass concentration. KW - Luftreinhaltung KW - Deutscher Wetterdienst KW - Forschungsflugzeug KW - Messtechnik KW - Atmosphärisches Aerosol KW - Saharastaub Y1 - 2015 UR - https://web.archive.org/web/20250314100317/https://meetingorganizer.copernicus.org/EGU2015/EGU2015-9776.pdf N1 - Vortragsabstract VL - 17 PB - Copernicus CY - Göttingen ER -