Spectral Near Field Data Of Led Systems For Optical Simulations

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Spectral Near Field Data Of Led Systems For Optical Simulations

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Author : Rotscholl, Ingo
language : en
Publisher: KIT Scientific Publishing
Release Date : 2018-05-22

Spectral Near Field Data Of Led Systems For Optical Simulations written by Rotscholl, Ingo and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-22 with Color categories.

Spectral Near Field Data Of Led Systems For Optical Simulations

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Author : Ingo Rotscholl
language : en
Publisher:
Release Date : 2020-10-09

Spectral Near Field Data Of Led Systems For Optical Simulations written by Ingo Rotscholl and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-10-09 with Science categories.

This book presents, validates and applies a fast, accurate and general measurement and modeling technique to obtain spectral near field data of LED systems for optical simulations in order to address the steadily increasing requirements of modern high quality LED systems. It requires only a minimum of goniophotometric near field measurements and no time-consuming angularly resolved spectral measurements. The obtained results can be used directly in state-of-the-art ray tracers. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.

Sensorfusion Zur Kompensation Von Messfehlern Bei Kamerabasierter Farbverteilungsmessung

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Author : Sayanca, Inca Leopoldo
language : de
Publisher: KIT Scientific Publishing
Release Date : 2018-11-15

Sensorfusion Zur Kompensation Von Messfehlern Bei Kamerabasierter Farbverteilungsmessung written by Sayanca, Inca Leopoldo and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-15 with Technology (General) categories.

In this work we introduce a colour measurement method based on sensor fusion for the complete characterization of LED lighting systems. The measurement information from indirect, high-resolution filter camera measurements is combined with spectral and photometric point measurements. The results of the developed measurement method are angle-resolved chromaticity coordinates as well as angle-resolved spectral information.

Lebensdauer Von Led Baugruppen

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Author : Stöger, Fabian
language : de
Publisher: KIT Scientific Publishing
Release Date : 2022-09-15

Lebensdauer Von Led Baugruppen written by Stöger, Fabian and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-09-15 with Technology & Engineering categories.

Diese Arbeit befasst sich mit den Auswirkungen der Degradation, der in der LED eingesetzten Packagematerialien auf die Gesamtalterung von LED-Bauteilen. Dazu werden die im Bauteil vorkommenden Fehlermechanismen anhand der Alterung der verwendeten Packagematerialien beschrieben, vorhergesagt und miteinander in Verbindung gesetzt. Aus den gewonnenen Erkenntnissen werden Ansätze zur Verbesserung der Langzeitstabilität von LED-Baugruppen abgeleitet. - This work deals with the material degradation of LED package materials and their contribution to degradation of the whole LED device. The occurring failure modes within the LED package are described and predicted by the degradation of the used package materials. Based on these findings approaches for long lifetime LEDs are derived.

Weiterentwicklung Der Beleuchtungseinheit Led Basierter Projektionssysteme

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Author : Schulz, Benjamin
language : de
Publisher: KIT Scientific Publishing
Release Date : 2019-02-07

Weiterentwicklung Der Beleuchtungseinheit Led Basierter Projektionssysteme written by Schulz, Benjamin and has been published by KIT Scientific Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-02-07 with Technology (General) categories.

This work deals with the maximum achievable output flux of LED-projectors which is limited by physics. With the objective of increasing the output flux further, the illumination unit of LED-based projectors is enhanced systematically by improving existing technologies and developing new concepts.

Progress In Optics

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Author : Emil Wolf
language : en
Publisher: Elsevier
Release Date : 2012-09-05

Progress In Optics written by Emil Wolf and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-09-05 with Science categories.

In the 50 years since the first volume of Progress in Optics was published, optics has become one of the most dynamic fields of science. The volumes in this series that have appeared up to now contain more than 300 review articles by distinguished research workers, which have become permanent records for many important developments, helping optical scientists and optical engineers stay abreast of their fields. Comprehensive, in-depth reviews Edited by the leading authority in the field

Optochemical Nanosensors

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Author : Andrea Cusano
language : en
Publisher: CRC Press
Release Date : 2012-11-20

Optochemical Nanosensors written by Andrea Cusano and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-20 with Technology & Engineering categories.

Nanosized sensors enable the study of chemical and biochemical processes at a level and in dimensions that may not have been envisioned some 20 years ago. Fueled by their inherent small size and the unusual optical, magnetic, catalytic, and mechanical properties of nanoparticles, remarkable progress has been made in recent years in the development and utilization of nanosensors and optical nanotechnology will further widen the field. However, the design of new sensors requires new materials, new methods for their characterization, new optical sensing schemes, new approaches for creating nanosized structures, and new techniques for their interrogation in complex environments such as small living cells for studying biological signals or big public spaces for environmental monitoring . Optochemical Nanosensors covers the rapidly growing field of optical chemical nanosensing, a new and exciting area of research and development within the large field of optical chemical sensing and biosensing. Its many applications, including the detection of bioterrorist threats, food security, virology, explosive detection and more, are covered in these self-contained yet interrelated chapters. The book reviews optochemical sensors, starting from the basics in optoelectronicsand concluding with the presentation of diverse nanosensors. The authors offer insight into future trends in this growing field and present applications in the fields of medicine, security, and bioterrorism.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1994

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.

An Assessment Of The National Institute Of Standards And Technology Measurement And Standards Laboratories

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Author : National Research Council
language : en
Publisher: National Academies Press
Release Date : 2002-10-26

An Assessment Of The National Institute Of Standards And Technology Measurement And Standards Laboratories written by National Research Council and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-10-26 with Technology & Engineering categories.

This assessment of the technical quality and relevance of the programs of the Measurement and Standards Laboratories of the National Institute of Standards and Technology is the work of the 165 members of the National Research Council's (NRC's) Board on Assessment of NIST Programs and its panels. These individuals were chosen by the NRC for their technical expertise, their practical experience in running research programs, and their knowledge of industry's needs in basic measurements and standards. This assessment addresses the following: The technical merit of the laboratory programs relative to the state of the art worldwide; The effectiveness with which the laboratory programs are carried out and the results disseminated to their customers; The relevance of the laboratory programs to the needs of their customers; and The ability of the laboratories' facilities, equipment, and human resources to enable the laboratories to fulfill their mission and meet their customers' needs.

New Enhanced Sensitivity Infrared Laser Spectroscopy Techniques Applied To Reactive Plasmas And Trace Gas Detection

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Author : Stefan Welzel
language : en
Publisher: Logos Verlag Berlin GmbH
Release Date : 2009

New Enhanced Sensitivity Infrared Laser Spectroscopy Techniques Applied To Reactive Plasmas And Trace Gas Detection written by Stefan Welzel and has been published by Logos Verlag Berlin GmbH this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Science categories.

Infrared laser absorption spectroscopy (IRLAS) employing both tuneable diode and quantum cascade lasers (TDLs, QCLs) has been applied with both high sensitivity and high time resolution to plasma diagnostics and trace gas measurements. TDLAS combined with a conventional White type multiple pass cell was used to detect up to 13 constituent molecular species in low pressure Ar/H2/N2/O2 and Ar/CH4/N2/O2 microwave discharges, among them the main products such as H2O, NH3, NO and CO, HCN respectively. The hydroxyl radical has been measured in the mid infrared (MIR) spectral range in-situ in both plasmas yielding number densities of between 1011 ... 1012 cm-3. Strong indications of surface dominated formation of either NH3 or N2O and NO were found in the H2-N2-O2 system. In methane containing plasmas a transition between deposition and etching conditions and generally an incomplete oxidation of the precursor were observed. The application of QCLs for IRLAS under low pressure conditions employing the most common tuning approaches has been investigated in detail. A new method of analysing absorption features quantitatively when the rapid passage effect is present is proposed. If power saturation is negligible, integrating the undisturbed half of the line profile yields accurate number densities without calibrating the system. By means of a time resolved analysis of individual chirped QCL pulses the main reasons for increased effective laser line widths could be identified. Apart from the well-known frequency down chirp non-linear absorption phenomena and bandwidth limitations of the detection system may significantly degrade the performance and accuracy of inter pulse spectrometers. The minimum analogue bandwidth of the entire system should normally not fall below 250 MHz. QCLAS using pulsed lasers has been used for highly time resolved measurements in reactive plasmas for the first time enabling a time resolution down to about 100 ns to be achieved. A temperature increase of typically less than 50 K has been established for pulsed DC discharges containing Ar/N2 and traces of NO. The main NO production and depletion reactions have been identified from a comparison of model calculations and time resolved measurements in plasma pulses of up to 100 ms. Considerable NO struction is observed after 5 ... 10 ms due to the impact of N atoms. Finally, thermoelectrically cooled pulsed and continuous wave (cw) QCLs have been employed for high finesse cavity absorption spectroscopy in the MIR. Cavity ring down spectroscopy (CRDS) has been performed with pulsed QCLs and was found to be limited by the intrinsic frequency chirp of the laser suppressing an efficient intensity build-up inside the cavity. Consequently the accuracy and advantage of an absolute internal absorption calibration is not achievable. A room temperature cw QCL was used in a complementary cavity enhanced absorption spectroscopy (CEAS) configuration which was equipped with different cavities of up to 1.3 m length. This spectrometer yielded path lengths of up to 4 km and a noise equivalent absorption down to 4 x 10-8 cm-1Hz-1/2. The corresponding molecular concentration detection limit (e.g. for CH4, N2O and C2H2 at 1303 cm-1/7.66 Aem) was generally below 1 x 1010 cm-3 for 1 s integration times and one order of magnitude less for 30 s integration times. The main limiting factor for achieving even higher sensitivity is the residual mode noise of the cavity. Employing a 0.5 m long cavity the achieved sensitivity was good enough for the selective measurement of trace atmospheric constituents at 2.2 mbar.