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Browsing by Subject "Laser applications"

Now showing items 1-20 of 37

Approaches toward optimized laser-induced damage thresholds of dispersive compensating mirrors applying nanolaminates

Willemsen, T.; Brinkmann, M.; Jupé, M.; Gyamfi, M.; Schlichting, S.; Ristau, Detlev (Bellingham, WA : S P I E - International Society for Optical Engineering, 2017)

Ultra-short laser applications require high quality dielectric optics. The natural dispersion of light needs to be matched by dielectric components. However such dispersive components are very challenging for the deposition ...
Beam extraction using non vacuum electron beam by reduced acceleration voltage

Hassel, T.; Klimov, G.; Beniyash, A. (Bristol : Institute of Physics Publishing, 2018)

One of the disadvantages of the non-vacuum electron beam (NVEB) systems is a high acceleration voltage, which leads to an increase of defence against X-ray radiation. Due to the reduced acceleration voltage. On the one ...
The benefit of 3D laser scanning technology in the generation and calibration of FEM models for health assessment of concrete structures

Yang, Hao; Xu, Xiangyang; Neumann, Ingo (Basel : MDPI AG, 2014)

Terrestrial laser scanning technology (TLS) is a new technique for quickly getting three-dimensional information. In this paper we research the health assessment of concrete structures with a Finite Element Method (FEM) ...
Characterization of the optical encoder angular noise from terrestrial laser scanners

Kermarrec, Gaël; Hartmann, Jens (Washington, DC : Optica, 2021)

Rigorous statistical testing of deformation using a terrestrial laser scanner (TLS) can avoid events such as structure collapses. Such a procedure necessitates an accurate description of the TLS measurements’ noise, which ...
Comparison of target-and mutual informaton based calibration of terrestrial laser scanner and digital camera for deformation monitoring

Omidalizarandi, Mohammad; Neumann, Ingo (Göttingen : Copernicus GmbH, 2015)

In the current state-of-the-art, geodetic deformation analysis of natural and artificial objects (e.g. dams, bridges,.) is an ongoing research in both static and kinematic mode and has received considerable interest by ...
Deformation analysis using B-spline surface with correlated terrestrial laser scanner observations-a bridge under load

Kermarrec, Gaël; Kargoll, Boris; Alkhatib, Hamza (Basel : MDPI AG, 2020)

The choice of an appropriate metric is mandatory to perform deformation analysis between two point clouds (PC)-the distance has to be trustworthy and, simultaneously, robust against measurement noise, which may be correlated ...
Digital laser micro- and nanoprinting

Li, Qingfeng; Grojo, David; Alloncle, Anne-Patricia; Chichkov, Boris; Delaporte, Philippe (Berlin : De Gruyter, 2018)

Laser direct writing is a well-established ablation technology for high-resolution patterning of surfaces, and since the development of additive manufacturing, laser processes have also appeared very attractive for the ...
Electrical and optical properties linked to laser damage behavior in conductive thin film materials

Steinecke, Morten; Naran, Tank Ankit; Keppler, Nils Christian; Behrens, Peter; Jensen, Lars; Jupé, Marco; Ristau, Detlev (Washington, DC : OSA - The Optical Society, 2021)

Epsilon-near-zero-materials (ENZ-materials) and their unique properties are key to the successful integration and miniaturization of optical components. Novel concepts, which promise significant progress in this field of ...
Enhancement of the damage resistance of ultra-fast optics by novel design approaches

Willemsen, Thomas; Jupé, Marco; Gyamfi, Mark; Schlichting, Sebastian; Ristau, Detlev (Washington, DC : Optical Society of America, 2017)

Dielectric components are essential for laser applications. Chirped mirrors are applied to compress the temporal pulse broadening crucial in the femtosecond regime. However, the design sensitivity and the electric field ...
Exploring ALS and DIM data for semantic segmentation using CNNs

Politz, F.; Sester, M. (Katlenburg-Lindau : Copernicus Publications, 2018)

Over the past years, the algorithms for dense image matching (DIM) to obtain point clouds from aerial images improved significantly. Consequently, DIM point clouds are now a good alternative to the established Airborne ...
Fast and automatic depth control of iterative bone ablation based on optical coherence tomography data

Fuchs, Alexander; Pengel, Steffen; Bergmeier, Jan; Kahrs, Lüder Alexander; Ortmaier, Tobias (Bellingham, Wash. : SPIE, 2015)

Laser surgery is an established clinical procedure in dental applications, soft tissue ablation, and ophthalmology. The presented experimental set-up for closed-loop control of laser bone ablation addresses a feedback ...
Finite element analysis based on a parametric model by approximating point clouds

Xu, Wei; Neumann, Ingo (Basel : MDPI AG, 2020)

Simplified models are widely applied in finite element computations regarding mechanical and structural problems. However, the simplified model sometimes causes many deviations in the finite element analysis (FEA) of ...
Fluxless Brazing of aluminum alloys using non vacuum electron beam by 60kV acceleration voltage

Klimov, G.; Maier, H.-J.; Beniyash, A.; Hassel, T. (Bristol : Institute of Physics Publishing, 2018)

Lightweight construction materials, in particular aluminum alloys, have recently become more important as construction materials due to their low weight with high strength and sufficient wear and corrosion properties. In ...
A framework based on reference data with superordinate accuracy for the quality analysis of terrestrial laser scanning-based multi-sensor-systems

Stenz, Ulrich; Hartmann, Jens; Paffenholz, Jens-André; Neumann, Ingo (Basel : MDPI AG, 2017)

Terrestrial laser scanning (TLS) is an efficient solution to collect large-scale data. The efficiency can be increased by combining TLS with additional sensors in a TLS-based multi-sensorsystem (MSS). The uncertainty of ...
Functionality of laser-sintered shape memory micro-actuators

Dudziak, S.; Gieseke, M.; Haferkamp, H.; Barcikowski, S.; Kracht, D. (Amsterdam : Elsevier B.V., 2010)

NiTi shape memory alloys are considered to be difficult to machine. Dimensional accuracy can hardly be met especially in micro-machining. Being a non-contact tool and therefore independent from machining forces, the laser ...
Gold nanoparticle-mediated laser stimulation causes a complex stress signal in neuronal cells

Johannsmeier, Sonja; Heeger, Patrick; Terakawa, Mitsuhiro; Kalies, Stefan; Heisterkamp, Alexander; Ripken, Tammo; Heinemann, Dag (Bellingham, WA : S P I E - International Society for Optical Engineering, 2017)

Gold nanoparticle mediated laser stimulation of neuronal cells allows for cell activation on a single-cell level. It could therefore be considered an alternative to classical electric neurostimulation. The physiological ...
High-precision 3D object capturing with static and kinematic terrestrial laser scanning in industrial applications-approaches of quality assessment

Stenz, Ulrich; Hartmann, Jens; Paffenholz, Jens-André; Neumann, Ingo (Basel : MDPI AG, 2020)

Abstract Terrestrial laser scanning is used in many disciplines of engineering. Examples include mobile mapping, architecture surveying, archaeology, as well as monitoring and surveillance measurements. For most of the ...
How significant are differences obtained by neglecting correlations when testing for deformation: A real case study using bootstrapping with terrestrial laser scanner observations approximated by b-spline surfaces

Kermarrec, Gaël; Paffenholz, Jens-André; Alkhatib, Hamza (Basel : MDPI AG, 2019)

B-spline surfaces possess attractive properties such as a high degree of continuity or the local support of their basis functions. One of the major applications of B-spline surfaces in engineering geodesy is the least-square ...
Improving partial wetting resolution on flexible substrates for application of polymer optical waveguides

Hoffmann, Gerd-Albert; Wolfer, Tim; Reitberger, Thomas; Franke, Jörg; Suttmann, Oliver; Overmeyer, Ludger (Bellingham, WA : S P I E - International Society for Optical Engineering, 2017)

Considering the increasing amount of data for communication and infotainment applications, fabrication of optical networks and bus systems is a challenging task for production engineering. A two-step manufacturing process ...
Integrity and collaboration in dynamic sensor networks

Schön, Steffen; Brenner, Claus; Alkhatib, Hamza; Coenen, Max; Dbouk, Hani; Garcia-Fernandez, Nicolas; Fischer, Colin; Heipke, Christian; Lohmann, Katja; Neumann, Ingo; Nguyen, Uyen; Paffenholz, Jens-André; Peters, Torben; Rottensteiner, Franz; Schachtschneider, Julia; Sester, Monika; Sun, Ligang; Vogel, Sören; Voges, Raphael; Wagner, Bernardo (Basel : MDPI AG, 2018)

Global Navigation Satellite Systems (GNSS) deliver absolute position and velocity, as well as time information (P, V, T). However, in urban areas, the GNSS navigation performance is restricted due to signal obstructions ...

Now showing items 1-20 of 37

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