Abstract
The major impact of laser-based imaging on engine research and development is due to the ability to visualize, and in some cases quantitatively image, the in-cylinder fuel distribution. Typically, high-power ultra-violet laser beams are used to excite tracers and fluorescence is captured with image-intensified CCD cameras. The need for more detailed information about temporal evolution of fuel distributions within a single cycle and consecutive cycles can now be addressed with the use of frequency-tripled diode-pumped Nd:YAG lasers. In combination with image-intensified CMOS cameras, it is possible to image laser-induced fluorescence signals from biacetyl that is used as a fuel tracer. Examples taken in a direct-injection engine illustrate the capabilities of the technique.
© 2006 Optical Society of America
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