[OPTICAL REVIEW Vol. 5, No. 2 (1998) 119-123]

Simultaneous Laser-Induced Fluorescence Imaging of Unburnt and Reacting Areas in Combustion Fields Using a KrF Excimer Laser

Masayuki TAMURA,1 Teruhiro SAKURAI2 and Hideo TAI1

1Fundamental Technology Research Laboratory, 2Energy Technology Research Institute, Tokyo Gas Co., Ltd., 1-16-25, Shibaura, Minato-ku, Tokyo, 105-0023 Japan

(Received January 26, 1998; Accepted February 25, 1998)

Simultaneous two-dimensional imaging of an unburnt area and a reacting area was performed using laser-induced fluorescence. Acetone was added to fuel as a tracer, and OH radical was used as a marker of the reacting area. A narrow band tunable KrF excimer laser (248 nm) was employed to excite acetone and OH simultaneously. Two intensified CCD cameras with different wavelength filters were used to detect these two kinds of species respectively. Detecting 294-314 nm (A-X (3,2), etc.) for OH and 335-410 nm for acetone, we obtained images of each species without interference of a signal from the other. The method was also successfully applied to flames in a pressurized combustion chamber under the pressure of 0.5 MPa.

Key words : laser-induced fluorescence, LIF, laser-induced predissociation fluorescence, visualization, combustion, fuel, acetone, OH, excimer laser