@inproceedings{HartmannTaubert, author = {Hartmann, J{\"u}rgen and Taubert, Dieter Richard}, title = {Assessing blackbody emissivity by monte carlo simulation}, series = {Proc. of the Int. Conference of Infrared Sensors and Systems}, booktitle = {Proc. of the Int. Conference of Infrared Sensors and Systems}, publisher = {AMA Service GmbH}, pages = {133 -- 138}, language = {en} } @inproceedings{Hartmann, author = {Hartmann, J{\"u}rgen}, title = {Measurement of T-T90 down to zinc point temperatures with absolute filter radiometry}, series = {Proc. of TEMPMEKO}, booktitle = {Proc. of TEMPMEKO}, pages = {377 -- 382}, language = {en} } @inproceedings{HartmannManaraZipfetal., author = {Hartmann, J{\"u}rgen and Manara, Jochen and Zipf, Matthias and Stark, Thomas and Arduini, Mariacarla and Ebert, Hans-Peter and Tutschke, Andreas and Hallam, Andrew and Hanspal, Jagdevinder and Langley, Mark}, title = {Development and validation of a long wavelength infrared (LWIR) radiation thermometer for contactless temperature measurements in gas turbines during operation}, series = {EVI-GTI and PIWG Joint Conference on Gas Turbine Instrumentation}, booktitle = {EVI-GTI and PIWG Joint Conference on Gas Turbine Instrumentation}, publisher = {IET}, pages = {1 -- 26}, abstract = {A collection of slides from the author's conference presentation is given. The presentation introduces the infrared-optical characterization of thermal barrier coatings and the development of LWIR pyrometer for measuring temperature in an operating gas turbine. The test facility for evaluating the LWIR pyrometer is also presented. This presentation includes the experimental setup for LWIR calibration and measurement.}, language = {en} } @inproceedings{HartmannSakumaMa, author = {Hartmann, J{\"u}rgen and Sakuma, F. and Ma, L.}, title = {Intercomparison of Radiation Temperature Scales between PTB and NMIJ from 1000-degree Celsius to 2500-degree Celsius}, series = {SICE Annual Conference Program and Abstracts SICE Annual Conference 2002}, booktitle = {SICE Annual Conference Program and Abstracts SICE Annual Conference 2002}, publisher = {The Society of Instrument and Control Engineers}, pages = {13 -- 13}, abstract = {The intercomparison of radiation temperature scales between PTB and NMIJ was carried out in September 2001. PTB sent their radiation thermometer LP3 to Japan and NMIJ made the comparison between the LP3 and NMIJ's Topcon radiation thermometers with a comparison blackbody from 1000 C to 2500 C. Both scales agreed within±0.8 C in the whole range.}, language = {en} } @inproceedings{BlotevogelEgermannGoldlueckeetal., author = {Blotevogel, Thomas and Egermann, Jan and Goldl{\"u}cke, J{\"u}rgen and Leipertz, Alfred and Hartmann, Matthias and Schenk, Martin and Berckm{\"u}ller, Martin}, title = {Untersuchungen zur Gemsichbildung in Wasserstoffmotoren}, editor = {Leipertz, Alfred}, publisher = {Esytec}, address = {Erlangen}, isbn = {3-931901-27-0}, pages = {12}, abstract = {Mittels der planaren laserinduzierten Fluoreszenz (PLIF) k{\"o}nnen im Brennraum eines Transparentmotors Messungen durchgef{\"u}hrt werden, die den Gemischbildungsprozess beim Wasserstoffmotor zweidimensional qualitativ darstellen. Auch quantitative Messungen und damit Aussagen {\"u}ber das Kraftstoff-Luft-Verh{\"a}ltnis im Brennraum sind m{\"o}glich. F{\"u}r diese Messungen wird ein Gasgemisch ans Helium und einer Tracersubstanz verwendet, und der Motor wird geschleppt. Bei Betrieb des Motors in der Teillast sind auch Messungen im gefeuerten Betrieb, d.h. mit Wasserstoff und zugesetzter Tracersubstanz, m{\"o}glich. Durch direkte Messung des Kraftstoff-Luft-Verh{\"a}ltnisses und der Wasserstoffkonzentration am befeuerten Aggregat mit Hilfe der Raman-Spektroskopie konnte nachgewiesen werden, daß mittels PLIF der Einstr{\"o}mvorgang qualitativ und das Kraftstoff-Luft-Verh{\"a}ltnis quantitativ grunds{\"a}tzlich richtig erfaßt werden. Qualitative und quantitative PLIF-Messungen sind prinzipiell nicht nur bei Wasserstoffmotoren, sondern auch bei Gasmotoren mit anderen Brenngasen denkbar. Allerdings sind noch weitere Arbeiten erforderlich, um den Quantifizierungsfehler deutlich abzusenken. Zuk{\"u}nftiges Verbesserungspotential f{\"u}r diese Meßtechnik besteht in verschiedenen Punkten. Dazu geh{\"o}rt die Optimierung und Anpassung der Mischstrecke zur Erzeugung des Gas-Luft-Gemisches mit definiertem Kraftstoff-Luft-Verh{\"a}ltnis an die jeweiligen Meßaufgaben, um den relativen Fehler des Lambda-Wertes noch weiter zu reduzieren. Eine Verringerung der Tracerkonzentration erscheint problemlos m{\"o}glich. Um das Problem der Hintergrundfluoreszenz zu l{\"o}sen, sind verschiedene M{\"o}glichkeiten denkbar, die noch genauer zu untersuchen sind.}, language = {de} } @incollection{BlotevogelGoldlueckeEgermannetal., author = {Blotevogel, Thomas and Goldl{\"u}cke, J{\"u}rgen and Egermann, Jan and Leipertz, Alfred and Hartmann, Matthias and Schenk, Martin and Berckm{\"u}ller, Martin}, title = {Gemischbildungsuntersuchung in Gasmotoren mittels optischer Messverfahren, speziell in Wasserstoffmotoren}, series = {Gasfahrzeuge}, booktitle = {Gasfahrzeuge}, editor = {Dingel, Oliver}, publisher = {expert verlag}, address = {Renningen}, isbn = {3816924395}, publisher = {Hochschule f{\"u}r Angewandte Wissenschaften W{\"u}rzburg-Schweinfurt}, pages = {205 -- 229}, abstract = {Planar laser-induced fluorescence (PLIF) has been successfully used for the investigation of the mixture formation process in hydrogen engines for passenger cars. Detailed information has been obtained about process development (qualitative measurement) and on fuel/air-ratio (quantitative measurement) inside the combustion chamber. These results can be used for further optimization of mixture formation and combustion process concerning emissions and fuel consumption. The measurement technique used is not only limited to hydrogen or to passenger car engines, but can also be applied to other fuel gases like natural gas or to other engine sizes like bus engines. The main topic of this paper is the experimental verification of the procedure which was executed by simultaneous PLIF and Raman scattering measurements. By Raman scattering the fuel/air-ratio can directly be determined from direct concentration measurements of the different gas species. The fuel/air-ratios determined by PLIF and Raman measurements are in good agreement indicating that a quantitative fuel/air-ratio measurement during the mixture formation process of gas and hydrogen engines is possible by PLIF. This fact is also confirmed by other measurements, e.g., global fuel/air-ratio calculated from measured intake air and fuel gas flow.}, language = {de} } @inproceedings{HartmannDobhanEngelmannetal., author = {Hartmann, J{\"u}rgen and Dobhan, Alexander and Engelmann, Bastian and Eberhardt, Lars and Heusinger, Moritz and Raab, C and Schleif, Frank-Michael and T{\"u}rk, M.}, title = {Optimierung von Prozessen und Werkzeugmaschinen durch Bereitstellung, Analyse und Soll-Ist-Vergleich von Produktionsdaten: Digitalkonferenz}, language = {en} } @inproceedings{HartmannHarrerDotterweichetal., author = {Hartmann, J{\"u}rgen and Harrer, S. and Dotterweich, C. and Zink, Markus H. and Hemberger, Frank and Ebert, Hans-Peter and Schnitzler, Tim}, title = {Phase change materials for use in thermally and electrically stressed insulation for high voltage applications}, series = {2016 IEEE Electrical Insulation Conference}, booktitle = {2016 IEEE Electrical Insulation Conference}, publisher = {IEEE}, isbn = {978-1-4673-8706-4}, pages = {605 -- 608}, abstract = {The temperature of high voltage equipment is often the limiting factor when transmitting electrical energy because the electrical insulation can get severely aged when the temperature is exceeding a certain limit. Hence, cooling has to be improved or heat generation must be reduced to avoid damage of the insulation. In this paper a new method was examined by investigating electrically insulating phase change materials which are able to store latent heat during a phase change from the solid to liquid state in times of high energy demand. To verify the electrically insulating properties of paraffins, one class of phase change materials, a special test cell was designed allowing the determination of breakdown voltage of phase change materials. The measurements on one paraffin sample proved the promising electrical insulating properties and it was shown that the breakdown voltage in the liquid state is comparable …}, language = {en} } @inproceedings{ZinkDotterweichHartmannetal., author = {Zink, Markus H. and Dotterweich, C. and Hartmann, J{\"u}rgen and Harrer, S. and Hemberger, F. and Ebert, Hans-Peter and Schnitzler, Tim}, title = {Phase Change Materials for Use in Thermally and Electrically Stressed Insulation for High Voltage Applications}, series = {IEEE Electrical Insulation Conference}, volume = {2016}, booktitle = {IEEE Electrical Insulation Conference}, pages = {605 -- 608}, language = {en} } @inproceedings{HarrerDotterweichHartmannetal., author = {Harrer, S. and Dotterweich, C. and Hartmann, J{\"u}rgen and Zink, M. and Schnitzler, Tim and Ebert, Hans-Peter and Hemberger, Frank}, title = {Paraffine als Phasenwechselmaterialen in der elektrischen Isolierung von Hochspannungsbauteilen}, language = {de} }