Exciplex Fluorescence Visualization Systems for Pre-Combustion Diagnosis of an Automotive Gasoline Engine 960826
This paper reports the development of vapor/liquid visualization systems based on an exciplex (excited state complex) formed between dimethyl- or diethyl-substituted aniline and trimethyl-substituted naphthalenes. Quantum yields of individual monomers were measured and the exciplex emission spectra as well as fluorescence quenching mechanisms were analyzed. Among the many systems and formulations investigated in this study, an exciplex consisting of 7% 1,4,6-trimethylnaphthalene (TMN) and 5% N,N-dimethylaniline (DMA) in 88% isooctane was found to be the best system for the laser-induced exciplex fluorescence (LIEF) technique, which is used to observe mixture formation in diesel or spark ignition (SI) engines. Observation of spectrally separated fluorescence from monomer in the gas phase and from exciplex in the gasoline fuel [1] requires that the exciplex forming dopants have boiling points within the distillation range of gasoline (20 to 215°C). The systems reported here are expected to be coevaporative with isooctane solvent and thus they should be effective in tracking the vaporization of automotive gasoline fuel.
Citation: Kim, J., Golding, B., Schock, H., Keller, P. et al., "Exciplex Fluorescence Visualization Systems for Pre-Combustion Diagnosis of an Automotive Gasoline Engine," SAE Technical Paper 960826, 1996, https://doi.org/10.4271/960826. Download Citation
Author(s):
Jong U. Kim, Brage Golding, Harold J. Schock, Philip Keller, Daniel G. Nocera
Affiliated:
Michigan State Univ., Chrysler Technology Center
Pages: 9
Event:
International Congress & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Advances in Engine Combustion and Flow Diagnostics-SP-1157
Related Topics:
Gasoline
Gases
Imaging and visualization
Forming
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