TY - GEN A1 - Hasenstab, Andreas A1 - Krause, Martin ED - Cziesielski, E. T1 - Ultraschallechoverfahren an Holz PY - 2004 SN - 3-433-01705-0 SP - 52 EP - 58 PB - Ernst CY - Berlin AN - OPUS4-3145 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hasenstab, Andreas A1 - Krause, Martin A1 - Rieck, C. A1 - Hillemeier, B. T1 - Use of Low Frequency Ultrasound Echo Technique to Determine Cavities in Wooden Construction Composites T2 - 6th International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) CY - Berlin, Germany DA - 2003-09-16 PY - 2003 UR - http://www.ndt.net/article/ndtce03/papers/p051/p051.htm SN - 3-931381-49-8 SP - 1(?) EP - 9(?) PB - DGZfP CY - Berlin AN - OPUS4-3230 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hertwig, Andreas A1 - Martin, Sven A1 - Krüger, Jörg A1 - Spielmann, C. A1 - Lenner, M. A1 - Kautek, Wolfgang ED - Dausinger, F. ED - Lichtner, F. ED - Lubatschowski, H. T1 - Primary hazards and reliability of protective materials N2 - Femtosecond laser pulses are close to industrial use. The advantages of ultrashort laser pulses for micromachining applications especially in the case of dielectric and biological samples down to pulse durations of 5 fs have been established. The current international standards of laser safety are primarily concerned with CW and pulsed lasers down to the nanosecond range. Therefore, human tissue and laser-protection equipment was investigated with respect to its resistance and protection performance for femtosecond laser illumination down to 30 fs. This included filter glasses for laser protection eyewear, polymer and textile materials used in curtains and guards. Bulk absorber filters can provide enough protection against laser radiation, give a sufficiently broad absorption spectrum. Materials are damaged more easily by femtosecond laser radiation. The need for sufficient spectral broadness as well as the different damage thresholds have to be included in international laser safety standards. This work should trigger the development of novel eye-protection devices that are lighter and ergonomically more acceptable than present commercial models. KW - Lasersicherheit KW - Kurzpulslaser KW - Femtosekunden KW - Lasertechnik KW - Materialbearbeitung PY - 2004 SN - 3-540-20114-9 DO - https://doi.org/10.1007/b96440 SN - 0303-4216 N1 - Serientitel: Topics in applied physics – Series title: Topics in applied physics IS - 96 SP - 287 EP - 307 PB - Springer CY - Berlin AN - OPUS4-4661 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Martin, Sven A1 - Hertwig, Andreas A1 - Lenzner, Matthias A1 - Krüger, Jörg A1 - Kautek, Wolfgang T1 - Spot-size dependence of the ablation threshold in dielectrics for femtosecond laser pulses N2 - The multi-pulse ablation threshold of barium borosilicate glass was measured using 30-fs pulses of a high repetition rate (1 kHz) laser system. The threshold fluence was found to decrease with increasing beam radius ranging from 20 to 400 m. Two existing models are applied by considering thermal accumulation and point defects, respectively . PY - 2003 DO - https://doi.org/10.1007/s00339-003-2213-6 SN - 0947-8396 VL - 77 IS - 7 SP - 883 EP - 884 PB - Springer CY - Berlin AN - OPUS4-6317 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Reinsch, Martin A1 - Töpfer, Antje A1 - Lehmann, Andreas A1 - Nehls, Irene T1 - Determination of ochratoxin A in wine by liquid chromatography tandem mass spectrometry after combined anion-exchange/reversed-phase clean-up N2 - Ochratoxin A (OTA) is a mycotoxin produced by Aspergillus ochraceus and Penicillium verrucosum. It has been found and analysed in several foods and feeds. Owing to its toxicity and occurrence in food and feed, the European Community has issued directives and some countries have their own regulations for OTA contents in food, feed and beverages. This work describes a method for the determination of OTA in mulled and red wine. It is based on combined anion exchange/reversed-phase clean-up and was analysed by liquid chromatography coupled with tandem mass spectrometry (multiple reaction monitoring). The method was validated with natural contaminated and spiked wine samples with OTA contents from 1.34 to 3.48 g kg–1. Owing to its accuracy, good reproducibility and repeatability, this easy method is a good alternative to liquid chromatography–fluorescence detection methods. KW - Ochratoxin A KW - Wine KW - Tandem mass spectrometry KW - Solid-phase extraction KW - Anion exchange KW - Liquid chromatography PY - 2005 DO - https://doi.org/10.1007/s00216-005-3097-4 SN - 1618-2642 SN - 1618-2650 VL - 381 IS - 8 SP - 1592 EP - 1595 PB - Springer CY - Berlin AN - OPUS4-10306 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Starke, K. A1 - Ristau, D. A1 - Martin, Sven A1 - Hertwig, Andreas A1 - Krüger, Jörg A1 - Allenspacher, P. A1 - Riede, W. A1 - Meister, S. A1 - Theiss, C. A1 - Sabbah, A. A1 - Rudolph, W. A1 - Raab, V. A1 - Grigonis, R. A1 - Rakickas, T. A1 - Sirutkaitis, V. ED - Exarhos, G. J. T1 - Results of a round-robin experiment in multiple-pulse LIDT measurement with ultrashort pulses T2 - 35th Annual Boulder Damage Symposium ; 35th Annual Symposium on Optical Materials for High-Power Lasers CY - Boulder, CO, USA DA - 2003-09-22 KW - Multiple-pulse damage KW - ISO 11254-2 KW - S on 1-LIDT KW - Round-robin experiment KW - CHOCLAB PY - 2004 SN - 0-8194-5163-0 DO - https://doi.org/10.1117/12.525135 SN - 0038-7355 N1 - Serientitel: Proceedings of SPIE – Series title: Proceedings of SPIE IS - 5273 SP - 388 EP - 395 PB - SPIE, the International Society for Optical Engineering CY - Bellingham, Wash. AN - OPUS4-4948 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Kautek, Wolfgang A1 - Hertwig, Andreas A1 - Martin, Sven A1 - Krüger, Jörg A1 - Lenzner, Matthias A1 - Spielmann, C. A1 - Lenner, M. A1 - Bunte, J. A1 - Puester, T. A1 - Burmester, T. A1 - Fiedler, A. A1 - Heberer, E. A1 - Brose, M. A1 - Stingl, A. A1 - Kiehl, P. A1 - Hönigsmann, H. A1 - Trautinger, F. A1 - Grabner, G. T1 - Safety in Femtosecond Laser Technology - Recent Results of a European Research Project (406) T2 - International Laser Safety Conference 2003 ; ILSC 2003 CY - Jacksonville, FL, USA DA - 2003-03-10 PY - 2003 SN - 0-912035-38-2 SP - 1(?) EP - 10(?) PB - Laser Institute of America CY - Orlando, Fla. AN - OPUS4-2259 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hasenstab, Andreas A1 - Krause, Martin A1 - Rieck, C. A1 - Hillemeier, B. T1 - Materialuntersuchung an Holz mit niederfrequenter Ultraschall-Echotechnik N2 - Kurzfassung Die Anwendung niederfrequenter Ultraschall-Echotechnik mit Longitudinal- und Transversalwellen für die Materialuntersuchung von Holzbauteilen wird beschrieben. Weiterhin wird der Einfluss der Holzfasern auf die Schallgeschwindigkeiten und Oberflächenwellen an Hand von Messergebnissen aufgezeigt. Die Leistungsfähigkeit des Ultraschall-Echoverfahrens an ungeschädigten Holzkörpern und Körpern mit eingebrachten Bohrungen in Faserrichtung (Kernfäulnissimulation) wird dargestellt. Es ist zudem möglich, bei koppelmittelfreier Ankopplung mit Transversalwellen indirekt Fäulnis von der ungeschädigten Bauteilseite aus zu orten. Als Referenzverfahren werden die Bohrwiderstandsmethode oder die Röntgendurchstrahlung eingesetzt. T2 - Jahrestagung Zerstörungsfreie Materialprüfung 2004 CY - Salzburg, Österreich DA - 2004-05-17 PY - 2004 UR - http://www.ndt.net/article/dgzfp04/papers/v87/v87.htm SN - 3-931381-55-2 SP - 1(?) EP - 9(?) PB - DGZfP CY - Berlin AN - OPUS4-5216 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hasenstab, Andreas A1 - Osterloh, Kurt A1 - Robbel, Joachim A1 - Krause, Martin A1 - Ewert, Uwe A1 - Hillemeier, B. T1 - Mobile Röntgenblitzröhren zum Auffinden von Holzschäden N2 - In diesem Beitrag wird die Anwendung von Radiographiesystemen zum Auffinden von Holzschäden beschrieben. Die Anlage besteht aus einer mobilen Röntgenblitzröhre und einem digitalen Radiographiesystem mit Speicherfolie oder einem Flachdetektor. An Hand der durchgeführten Versuche an Laub- und Nadelbäumen sowie an Eichenbalken der Marienkirche der Lutherstadt- Wittenberg wird die Detektion innerer Schäden gezeigt. T2 - Jahrestagung Zerstörungsfreie Materialprüfung 2004 CY - Salzburg, Österreich DA - 2004-05-17 PY - 2004 UR - http://www.ndt.net/article/dgzfp04/papers/p15/p15.htm SN - 3-931381-55-2 SP - 1(?) EP - 8(?) PB - DGZfP CY - Berlin AN - OPUS4-5217 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Osterloh, Kurt A1 - Hasenstab, Andreas A1 - Ewert, Uwe A1 - Krause, Martin A1 - Goebbels, Jürgen T1 - Mobile radiographische Untersuchung von Holz und Bäumen T2 - DGZfP Jahrestagung CY - Rostock, Deutschland DA - 2005-05-02 KW - Digitale Radiographie KW - Mobiles Röntgen PY - 2005 SN - 3-931381-64-1 N1 - Serientitel: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. – Series title: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. IS - 94-CD SP - 1(?) EP - 8(?) PB - DGZfP CY - Berlin AN - OPUS4-11866 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hasenstab, Andreas A1 - Krause, Martin A1 - Lutz, J. A1 - Hillemeier, B. A1 - Rieck, C. T1 - Niederfrequente Ultraschall-Echo-Verfahren und Bohrwiderstandsmessung zur Untersuchung von Holzbauteilen T2 - DGZfP Jahrestagung CY - Rostock, Deutschland DA - 2005-05-02 KW - ZfP an Holzbauteilen KW - Fehlstellen KW - Minderdicken KW - Ultraschallecho-Experimente an Probekörpern KW - Ultraschall-Echo KW - Fäulnis KW - Bauwesen PY - 2005 SN - 3-931381-64-1 N1 - Serientitel: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. – Series title: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. IS - 94-CD SP - 1(?) EP - 11(?) PB - DGZfP CY - Berlin AN - OPUS4-11960 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hasenstab, Andreas A1 - Krause, Martin A1 - Hillger, w. A1 - Bühling, L. A1 - Ilse, D. A1 - Hillemeier, B. A1 - Rieck, C. T1 - Luftultraschall und Ultraschall-Echo-Technik an Holz T2 - DGZfP Jahrestagung CY - Rostock, Deutschland DA - 2005-05-02 KW - ZfP an Holzbauteilen KW - Fehlstellen KW - Minderdicken KW - Ultraschallecho-Experimente an Probekörpern KW - Ultraschall-Echo KW - Fäulnis KW - Bauwesen KW - Luftultraschall PY - 2005 SN - 3-931381-64-1 N1 - Serientitel: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. – Series title: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. IS - 94-CD SP - 1(?) EP - 15(?) PB - DGZfP CY - Berlin AN - OPUS4-11961 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hasenstab, Andreas A1 - Krause, Martin A1 - Scheer, C. T1 - Zerstörungsfreie Integritätsprüfung von Holz mit dem Ultraschallecho-Verfahren T2 - Forschungskolloquium "Holzbau Forschung + Praxis" CY - Stuttgart, Deutschland DA - 2006-02-23 PY - 2006 SP - 33 EP - 40 PB - Technische Universität Stuttgart CY - Stuttgart AN - OPUS4-12242 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hertwig, Andreas A1 - Martin, Sven A1 - Krüger, Jörg A1 - Kautek, Wolfgang T1 - Interaction area dependence of the ablation threshold of ion-doped glass N2 - The laser ablation behaviour of ion-doped glass filter materials under irradiation with femtosecond laser pulses was investigated with respect to spot size and repetition rate. The damage threshold fluence of Schott BG18 depends on the size of the irradiated area. The effect is discussed in terms of a defect-site model. KW - Femtosecond KW - Laser KW - Materials processing KW - Ablation KW - Threshold KW - Glass PY - 2004 DO - https://doi.org/10.1016/j.tsf.2003.11.131 SN - 0040-6090 VL - 453-454 SP - 527 EP - 530 PB - Elsevier CY - Amsterdam AN - OPUS4-11046 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hertwig, Andreas A1 - Martin, Sven A1 - Krüger, Jörg A1 - Kautek, Wolfgang T1 - Surface damage and color centers generated by femtosecond pulses in borosilicate glass and silica N2 - Color center generation by femtosecond laser pulses (30 fs) is observed in a fluence range below the damage threshold in an alkali-free barium borosilicate (BBS) glass, and in a thin layer of SiO2 on a fused silica substrate. The color centers are characterized spectroscopically. The optical density of the color centers in BBS glass is by two orders of magnitude higher than that in silica. A healing process with a time constant of about 30 h can be found. PY - 2004 UR - http://www.sciencedirect.com/science/journal/0926860X DO - https://doi.org/10.1007/s00339-004-2634-x SN - 0947-8396 VL - 79 SP - 1075 EP - 1077 PB - Springer CY - Berlin AN - OPUS4-11047 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hasenstab, Andreas A1 - Hillemeier, B. A1 - Krause, Martin ED - Bröker, F. T1 - Defect localisation in wood with low frequency ultrasonic echo technique T2 - 14th International Symposium on Nondestructive Testing of Wood CY - Eberswalde, Germany DA - 2005-05-02 PY - 2005 SN - 3-8322-3949-9 SP - 331 EP - 336 PB - Shaker CY - Aachen AN - OPUS4-11307 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Martin, Sven A1 - Krüger, Jörg A1 - Hertwig, Andreas A1 - Fiedler, A. A1 - Kautek, Wolfgang T1 - Femtosecond laser interaction with protection materials N2 - Textile, aluminium and polyethylene used as components in laser protection curtains were investigated with respect to their ablation behaviour. Employing 33-fs pulses (800 nm wavelength, 1 kHz repetition rate), ex situ geometrical measurements of the ablation cavities and in situ acoustic investigations with a microphone were performed to determine the ablation thresholds in the single- and multi-pulse cases. The acoustical method proved advantageous for complex surface morphologies and/or single laser pulse interactions. Incubation phenomena can be observed for all the materials studied. Technically relevant multi-pulse ablation thresholds are presented and are compared with the single-pulse (1-on-1) irradiation. KW - Damage KW - Femtosecond laser ablation KW - Laser safety KW - Threshold KW - Aluminium KW - Textile PY - 2003 DO - https://doi.org/10.1016/S0169-4332(02)01392-2 SN - 0169-4332 SN - 1873-5584 VL - 208-209 SP - 333 EP - 339 PB - North-Holland CY - Amsterdam AN - OPUS4-11546 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bunte, J. A1 - Barcikowski, S. A1 - Burmester, T. A1 - Püster, T. A1 - Hertwig, Andreas A1 - Kautek, Wolfgang A1 - Krüger, Jörg A1 - Martin, Sven A1 - Spielmann, C. A1 - Lenner, M. A1 - Brose, M. T1 - Sicherer Umgang mit Ultrakurzpuls-Lasern, Teil 1: Primäre Gefährdungen PY - 2005 SN - 0945-8875 IS - 2 SP - 6 EP - 11 PB - Magazin-Verl. CY - Bad Nenndorf AN - OPUS4-11001 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bunte, J. A1 - Barcikowski, S. A1 - Burmester, T. A1 - Püster, T. A1 - Hertwig, Andreas A1 - Kautek, Wolfgang A1 - Krüger, Jörg A1 - Martin, Sven A1 - Spielmann, C. A1 - Lenner, M. A1 - Brose, M. T1 - Sicherer Umgang mit Ultrakurzpuls-Lasern, Teil 2: Sekundäre Gefährdungen PY - 2005 SN - 0945-8875 IS - 4 SP - 13 EP - 18 PB - Magazin-Verl. CY - Bad Nenndorf AN - OPUS4-11002 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hertwig, Andreas A1 - Martin, S. A1 - Kautek, Wolfgang A1 - Krüger, Jörg ED - Maruray, L. T1 - Ultra-short Pulse Laser Safety - a Challenge to Materials Science N2 - In this paper, safety-related experiments with ultra-short laser pulses (down to 30 fs) on various components (goggles, curtains) for laser protection are presented. The damage and failure behaviour of protective devices has been investigated dependent on practical conditions such as pulse duration, laser .uence, pulse number, and repetition rate. The e.ects of laser-irradiation on materials can be roughly divided into transient ones like laserinduced transmission (LIT) or short-lived colour centres and permanent damages like the stable colour centres and ablation. The former e.ects are particularly important for transparent devices like laser goggles. To obtain a complete overview on laser safety issues and the prevention of failure there are two important .elds of investigation: 1. the e.ects of laser radiation on human eyes and skin, and 2. on the possible protection materials. Both .elds have been addressed during the recently .nished German project SAFEST (safety aspects in femtosecond technology). The amount of safety data available in the ultrashort pulse region has been increased remarkably. This allows for a re-evaluation of known laser protection materials for this region of pulse durations and for the evaluation of new designs that promise high protection levels while being light-weight and convenient to use. T2 - Optical design and engineering II CY - Jena, Germany DA - 2005-09-13 PY - 2005 N1 - Serientitel: Proceedings of SPIE – Series title: Proceedings of SPIE IS - 5962 SP - 59622J-1 - 59622J-10 PB - SPIE CY - Bellingham AN - OPUS4-11593 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hasenstab, Andreas A1 - Krause, Martin T1 - Ultraschall-Echo-Technik zur Ortung von Minderdicken und Schäden in Holzbauteilen T2 - DGZfP-Fachtagung Bauwerksdiagnose "Praktische Anwendungen Zerstörungsfreier Prüfungen" CY - Berlin, Deutschland DA - 2006-02-22 KW - Zerstörungsfreie Prüfung KW - Holz KW - Ultraschallecho KW - ZfP an Holzbauteilen KW - Fehlstellen KW - Minderdicken KW - Ultraschall-Echo KW - Fäulnis KW - Bauwesen PY - 2006 SN - 3-931381-71-4 SP - 1(?) EP - 11(?) PB - DGZfP CY - Berlin AN - OPUS4-14233 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -