| Zugriffsnummer | 24908 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Thermal management of light sources |
| Autor(in); Institution |
Hartmann, Jürgen; 7.3, Detektorradiometrie und Strahlungsthermometrie, PTB-Berlin
Völker, Stephan; TU Berlin, Berlin, GERMANY
|
| Quelle/Jahr | TEMPMEKO & ISHM 2010 special issue 2. International Journal of Thermophysics: 32 (2011), 1/2, 513 - 522 |
| ISSN | 0195-928X (PRINT) ; 1572-9567 (ONLINE) |
| DOI | |
| Verlag | Dordrecht: Springer |
| Konferenzangaben | TEMPMEKO & ISHM 2010, Portoroz, 31 May - 04 June, 2010, Slovenia |
| Zusammenfassung | The primary task of light sources is illumination, i.e. the emission of visible radiation – light. However, depending on the generation principle besides light, also heat will be dissipated to the surrounding. Classical thermal light sources generate light by the electrical heating of a tungsten wire to temperatures of about 3000 K. Even at this temperature the majority of the emitted radiation is within the long wavelength range of the spectrum, i.e. not in the range of visible radiation. Generation of light with discharge lamps is totally different and non-thermal, however, even in this case the electrodes are heated up to temperatures well above 2000 K. Thus also discharge lamps suffer from thermal problems. In case of solid-state light sources, also non-thermal light sources, the electrical current causes a heating of the device, which is or should usually be below 150 °C for proper operation. Such relatively low temperatures of solid-state light sources prevent an efficient cooling by thermal radiation, requiring a convective or conductive cooling. For all mentioned light sources the Thermal Management, i.e. the adjusting and maintaining of an optimum operation temperature is vital for the efficiency and life time of the light sources. The paper deals with the methods of generation and measurement of the thermal load and discusses ways to optimize the efficiency and life time of such light sources. Also some practical examples are given to emphasize the relevance of such Thermal Management for industry, pointing out the potential for future more energy-efficient light source concepts. |
