Part of
The state of the art in the optical characterization of materials is advancing rapidly. New insights have been gained into the theoretical foundations of this research and exciting developments have been made in practice, driven by new applications and innovative sensor technologies that are constantly evolving.
Umfang: VII ,178 S.
Preis: 44.00 €
Buchdetails
Die Simulation keramischer Leuchtstoffe mittels der Diffusionsnäherung der Strahlungstransportgleichung wird von rotationssymmetrischen Fällen auf allgemeine, dreidimensionale Problemstellungen erweitert. Der Leuchtstoff wird erstmalig mittels der Diffusionsnäherung mit einer zeitlich und örtlich veränderlichen Laserlichtquelle untersucht. Dazu werden verschiedene Laserlichtquellen verglichen, um erauszuarbeiten, welche der Alternativen sich am besten für die Anwendung im Scheinwerfer eignet.
The simulation of ceramic phosphors by means of the diffusion approximation of the radiation transport equation is extended from rotationally symmetrical cases to general, three-dimensional problems. The phosphor is simulated with the diffusion approximation for a temporal and spacial variable laser light source for the first time. Therefore, different laser light sources are being compared to evaluate, which one of the alternatives is best suited for the intended use in an automotive head lamp.
Umfang: VII, 177 S.
Preis: 42.00 €
Buchdetails
Photonic integrated circuits (PIC) become increasingly important for numerous applications. Mass production of PIC has become widely available, but large-volume low-cost photonic packaging still represents a challenge. Additive micro-fabrication of free-form optical coupling structures is discussed as a concept to overcome this technology gap. Multi-photon 3D-lithography is used to fabricate dielectric waveguides ("photonic wire bonds", PWB) as well as facet-attached microlenses (FaML).
Umfang: XV, 265 S.
Preis: 49.00
Buchdetails
An early detection and diagnosis of atrial fibrillation sets the course for timely intervention to prevent potentially occurring comorbidities. Electrocardiogram data resulting from electrophysiological cohort modeling and simulation can be a valuable data resource for improving automated atrial fibrillation risk stratification with machine learning techniques and thus, reduces the risk of stroke in affected patients.
Umfang: XII, 252 S.
Preis: 49.00 €
Buchdetails
Hybrid perovskite photovoltaics could play a vital role in future’s renewable energy production. However, there are still severe challenges when scaling the technology. In this work, perovskite solution films drying in laminar and slot-jet air flows are investigated extensively by optical in situ characterization. The main results are a quantitative model of perovskite drying dynamics and a novel in situ imaging technique – yielding valuable predictions for large-scale perovskite fabrication.
Umfang: XI, 273 S.
Preis: 48.00 €
Buchdetails
Ein wellenleiterbasierter Sensorchip wird demonstriert, der für Point-of-Care-Anwendungen geeignet ist. Der Biosensor wird mit Hilfe eines mathematischen Modells entworfen, mit dem die Sensitivität der Wellenleiter untersucht wird. Für die Lichteinkopplung in die Wellenleiter wird erstmalig eine neue Klasse von integrierten Laserquellen für sichtbare Wellenlängen untersucht. Die Funktionsfähigkeit des wellenleiterbasierten Biosensorchips durch Detektionsexperimente erfolgreich nachgewiesen.
A waveguide-based sensor chip is demonstrated that is suitable for point-of-care applications. The biosensor is designed using a mathematical model to investigate the sensitivity of the waveguides. A new class of integrated laser sources for visible wavelengths is being investigated for the first time for light coupling into the waveguides. The functionality of the waveguide-based biosensor chip is successfully demonstrated by detection experiments.
Umfang: XV, 190 S.
Preis: 44.00 €
Buchdetails
Eine robuste Navigation sowie die Kartierung der Umgebung ist elementar für autonome Fluggeräte. Dies ist insbesondere in schwierigen Bedingungen durch Einschränkung der Sicht oder des GNSS-Empfangs sehr herausfordernd. Im Rahmen dieser Arbeit werden daher multisensorielle Fusionsverfahren basierend auf FMCW-Radarsensoren, Kameras und Inertialsensorik entwickelt. Diese Verfahren können auch in schwierigen Bedingungen eingesetzt werden, wie in verschiedenen Szenarios demonstriert wird.
Robust navigation as well as mapping of the environment are critical for autonomous aerial vehicles. This is especially challenging in poor visual conditions or degraded GNSS. Therefore, this thesis proposes multi-sensor fusion approaches based on FMCW radar, cameras and inertial sensors. These approaches can cope with such challenging conditions as demonstrated in different scenarios.
Umfang: XVII, 213 S.
Preis: 46.00 €
Buchdetails
This work presents three advances to scale SNSPDs from few-pixel devices to large detector arrays: atomic layer deposition for the fabrication of uniform superconducting niobium nitride films of few-nanometer thickness, a frequency-multiplexing scheme to operate multiple detectors with a reduced number of lines, and the integration of SNSPDs with free-form polymer structures to achieve efficient optical coupling onto the active area of the detectors.
Umfang: VII, 176 S.
Preis: 54.00 €
Buchdetails
Microwave-assisted alkaline hydrolysis of PET can be 20 times faster and at lower temperatures. This work presents a novel industrial microwave applicator at 2.45 GHz with homogeneous distribution to support this reaction, which allows an efficient and continuous operation. In addition, an innovative dielectric and calorimetric measurements setup is presented. Furthermore, the modelling of the reaction kinetics based on the measured dielectric parameters is presented.
Umfang: XXIV, 125 S.
Preis: 42.00 €
Buchdetails
This work presents the development of a new sub-THz source for the generation of trains of coherent high-power ultra-short pulses at 263 GHz via passive mode-locking of two coupled helical gyro-TWTs. For the first time, it is shown that the operation of such passive mode-locked helical gyro-TWTs in the hard excitation regime is of particular importance to reach the optimal coherency of the generated pulses. This could be of particular interest for some new time-domain DNP-NMR methods.
Umfang: XXV, 282 S.
Preis: 52.00 €
Buchdetails
