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Temperaturbasierte Methoden zur Bestimmung der Lebensdauer und Stabilisierung von LEDs im System

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Book Series: Spektrum der Lichttechnik / Karlsruher Institut für Technologie (KIT), Lichttechnisches Institut ISSN: 21951152 ISBN: 9783731500445 Year: Volume: 4 Pages: V, 215 p. DOI: 10.5445/KSP/1000035351 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:57
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In dieser Arbeit wird einerseits die Lebensdauer der LEDs im System aus der Datenblattangabe der Hersteller und dem gemessenen Betriebspunkt in Abhängigkeit der Umgebungstemperatur berechnet. Alternativ wird die Lichtstromdegradation des Gesamtsystems über mehrere tausend Stunden gemessen und auf den L70-Wert extrapoliert. Um dabei den Messfehler aufgrund mangelnder thermischer Stabilisierung zu eliminieren, wurde eine Methode zur analytischen Beschreibung der Stabilisierung entwickelt.

Analytisches Design von Freiformoptiken für Punktlichtquellen

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Book Series: Spektrum der Lichttechnik / Karlsruher Institut für Technologie (KIT), Lichttechnisches Institut ISSN: 21951152 ISBN: 9783731500544 Year: Volume: 5 Pages: VI, 146 p. DOI: 10.5445/KSP/1000035589 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:57
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During the development process of nonimaging systems the geometrical modeling of optical surfaces plays a decisive role. The presented mathematical algorithm generates optical freeform surfaces in a direct, non-iterative, calculation according to the specifications given by the optical designer. The shown method is applicable in particular to systems with very small light sources, e.g. LEDs, laser diodes and gas discharge lamps.

Intelligent Freeform Deformation for LED Illumination Optics

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Book Series: Spektrum der Lichttechnik / Karlsruher Institut für Technologie (KIT), Lichttechnisches Institut ISSN: 21951152 ISBN: 9783731507413 Year: Volume: 16 Pages: VII, 151 p. DOI: 10.5445/KSP/1000077210 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-28 18:37:01
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In freeform optics, the optimization is limited due to large number of parameters present in it. This limitation was overcome by a technique known as optimization using freeform deformation (OFFD). Though this technique proved to work well, it has left many challenges to the optical designer. These challenges are solved by providing mathematical design techniques. This implementation transformed the OFFD into an intelligent tool replacing the optical designer's efforts during the design process.

Sensorfusion zur Kompensation von Messfehlern bei kamerabasierter Farbverteilungsmessung

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Book Series: Spektrum der Lichttechnik / Karlsruher Institut für Technologie (KIT), Lichttechnisches Institut ISSN: 21951152 ISBN: 9783731508304 Year: Volume: 18 Pages: VII, 259 p. DOI: 10.5445/KSP/1000085279 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-28 18:37:01
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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.

Spectral near field data of LED systems for optical simulations

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Book Series: Spektrum der Lichttechnik / Karlsruher Institut für Technologie (KIT), Lichttechnisches Institut ISSN: 21951152 ISBN: 9783731507505 Year: Volume: 17 Pages: VIII, 212 p. DOI: 10.5445/KSP/1000078518 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-28 18:37:01
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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.

Farbmessung an LED-Systemen

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Book Series: Spektrum der Lichttechnik / Karlsruher Institut für Technologie (KIT), Lichttechnisches Institut ISSN: 21951152 ISBN: 9783731501732 Year: Volume: 6 Pages: IV, 124 p. DOI: 10.5445/KSP/1000038413 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Physics (General)
Added to DOAB on : 2019-07-30 20:01:59
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The light distribution of LED-systems, especially the colour distribution gets more and more important. As white light of LED-systems is received in a different way than with incandescent or fluorescent lamps different the radiation can contain different colours. Part of this work was to develop a method to present and describe these color shadows based on the results of existing color measurement methods.

Weiterentwicklung der Beleuchtungseinheit LED-basierter Projektionssysteme

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Book Series: Spektrum der Lichttechnik / Karlsruher Institut für Technologie (KIT), Lichttechnisches Institut ISSN: 21951152 ISBN: 9783731508656 Year: Volume: 19 Pages: III, 173 p. DOI: 10.5445/KSP/1000087780 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:00
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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.

Kopplung physiologischer und verfahrenstechnischer Parameter beim Wachstum und bei der Produktbildung der Rotalge Porphyridium purpureum

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ISBN: 9783866444737 Year: Pages: 154 p. DOI: 10.5445/KSP/1000015569 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:58
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Mikroalgen haben ein technisch interessantes Potential für die Herstellung von hochwertigen Naturstoffen wie Pigmente, Polysaccharide, ungasättigte Fettsäuren, Lipide oder Antioxidanten. In dieser Arbeit wurde das Wachstum und die Produktbildung von Porphyridium purpureum unter Hell/Dunkel-Zyklen verschiedener Frequenzen untersucht, da sie eine großen Einfluss auf die Produktivität von außen stehenden Anlagen haben. Das Produkt-Sensing-Verhalten der Rotalge wurde ebenfalls untersucht.

The Planning Polity

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Book Series: RTPI Library Series ISBN: 9780203987032 9780415286541 9780415286558 9781134447909 9781134447893 9781134447855 Year: DOI: 10.4324/9780203987032 Language: English
Publisher: Taylor & Francis
Subject: Architecture
Added to DOAB on : 2019-11-08 11:21:07
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Abstract

Planning is not a technical and value free activity. Planning is an overt political system that creates both winners and losers. The Planning Polity is a book that considers the politics of development and decision-making, and political conflicts between agencies and institutions within British town and country planning. The focus of assessment is how British planning has been formulated since the early 1990s, and provides an in-depth and revealing assessment of both the Major and Blair governments' terms of office. The book will prove to be an invaluable guide to the British planning system today and the political demands on it. Students and activists within urban and regional studies, planning, political science and government, environmental studies, urban and rural geography, development, surveying and planning, will all find the book to be an essential companion to their work.

Keywords

national --- policy --- local --- authority --- led --- system --- unitary --- development --- plans --- guidance

Entwicklung und Herstellung naturähnlich verzweigter Kühlkörper für LED-Systeme

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Book Series: Spektrum der Lichttechnik / Karlsruher Institut für Technologie (KIT), Lichttechnisches Institut ISSN: 21951152 ISBN: 9783731506355 Year: Volume: 14 Pages: IV, 228 p. DOI: 10.5445/KSP/1000066146 Language: GERMAN
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:59
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In terms of general lighting applications, this work deals with the use of natural models for the heat dissipation of LEDs, their implementation into a complete LED system and ultimately its manufacturing. The result is a lighting system that represents a high technical performance in conjunction with a high aesthetic value that can be an example for the development of different LED systems.

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