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- Title
Fluorescence spectroscopy of anisole at elevated temperatures and pressures.
- Authors
Tran, K.; Morin, C.; Kühni, M.; Guibert, P.
- Abstract
Laser-induced fluorescence of anisole as tracer of isooctane at an excitation wavelength of 266 nm was investigated for conditions relevant to rapid compression machine studies and for more general application of internal combustion engines regarding temperature, pressure, and ambient gas composition. An optically accessible high pressure and high temperature chamber was operated by using different ambient gases (Ar, N, CO, air, and gas mixtures). Fluorescence experiments were investigated at a large range of pressure and temperature (0.2-4 MPa and 473-823 K). Anisole fluorescence quantum yield decreases strongly with temperature for every considered ambient gas, due to efficient radiative mechanisms of intersystem crossing. Concerning the pressure effect, the fluorescence signal decreases with increasing pressure, because increasing the collisional rate leads to more important non-radiative collisional relaxation. The quenching effect is strongly efficient in oxygen, with a fluorescence evolution described by Stern-Volmer relation. The dependence of anisole fluorescence versus thermodynamic parameters suggests the use of this tracer for temperature imaging in specific conditions detailed in this paper. The calibration procedure for temperature measurements is established for the single-excitation wavelength and two-color detection technique.
- Subjects
FLUORESCENCE spectroscopy; ANISOLE; HIGH temperatures; PRESSURE; TRIMETHYLPENTANE; EXCITATION spectrum
- Publication
Applied Physics B: Lasers & Optics, 2014, Vol 115, Issue 4, p461
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-013-5626-8