Temperature measurements of combustible and non-combustible surfaces using laser induced phosphorescence

Summary, in English

In recent years, thermographic phosphors used for surface temperature measurements have been developed to suit combustion applications. Pulsed ultraviolet laser radiation at 266 nm and 7 ns duration was used to excite a thermographic phosphor, Mg4FGeO6:Mn, which was adapted to the surface of the investigated material. The laser-induced emission from the phosphor was recorded. A calibration of the phosphorescence lifetime and spectral properties against temperature allowed surface temperature measurements between 298 and 873 K. The techniques were successfully used in a flame spread scenario for two-dimensional measurements of surface temperature on a low-density fiber board. The phosphorescence images were obtained with eight consecutively gated CCD detectors enable pixel by pixel-lifetime evaluation of the phosphorescence by interpolating an exponentialdecay curve to the counts of the corresponding pixel positions of the sequential CCD images. The best precision, better than +/-5 K, was obtained at these temperatures. The technique was also applied to temperature measurements of decomposing materials in a pyrolysis oven. The material investigated was birch particles. Recent development of the technique has allowed other applications, e.g., to such as engine valve and droplets temperature measurements. (C) 2004 Elsevier Inc. All rights reserved.

• Författare: Alaa Omrane; Frederik Ossler; Marcus Aldén
• Avdelning/ar: Förbränningsfysik
• Publiceringsår: 2004
• Språk: Engelska
• Sidor: 669-676
• Publikation/Tidskrift/Serie: Experimental Thermal and Fluid Science
• Volym: 28
• Issue: 7
• Länkar: http://dx.doi.org/10.1016/j.expthermflusci.2003.12.003
• Dokumenttyp: Artikel i tidskrift
• Förlag: Elsevier
• Ämne: Atom and Molecular Physics and Optics
• Nyckelord: laser diagnostics; temperature measurements; combustion diagnostics
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 1879-2286