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Temperature measurements using exciplex fluorescence with TMPD and methylnaphthalene as tracers

Mats Andersson (Institutionen för tillämpad mekanik, Förbränning) ; Stina Hemdal (Institutionen för tillämpad mekanik) ; Raúl Ochoterena (Institutionen för tillämpad mekanik)
Proc. 22nd European Conference on Liquid Atomization and Spray Systems p. ILASS-08-P-19. (2008)
[Konferensbidrag, övrigt]

Laser-induced exciplex fluorescence has been used to measure the temperature in a spray of a diesel-like fuel. To a model fuel consisting of 70 % n-decane and 30 % 1-methylnaphthalene, TMPD was added in a concentration of 0.2 %. When excited with UV-light TMPD efficiently forms an exciplex with methylnaphthalene fluorescing with a peak intensity at a wavelength around 505 nm at room temperature. When the temperature of the fuel increases the peak position shifts to shorter wavelengths, and the peak reaches a position of 475 nm at 150 ºC. This shift of the fluorescence spectrum can be used to estimate the temperature of the liquid fuel, by measuring the fluorescence light intensity in two different wavelength intervals and evaluate the ratio between them as a function of temperature. The intensity ratio as a function of temperature was evaluated and calibrated, and subsequently used to determine the temperature of the liquid fuel along the spray axis.



Denna post skapades 2009-01-16. Senast ändrad 2012-01-11.
CPL Pubid: 88128

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Förbränning
Institutionen för tillämpad mekanik

Ämnesområden

Optisk fysik

Chalmers infrastruktur