Laser imaging inside engines for advanced direct injection gasoline engine development

Imaging techniques (laser Mie scattering, particle image velocimetry, spectrally-resolved spark and combustion luminosity, and laser induced fluorescence) with high repetition rate lasers and multiple CMOS cameras allow fuel injection, fuel/air mixing, ignition, and combustion to be followed within one engine cycle. This aids the design of advanced gasoline direct injection engines by avoiding intermittent poor burning engine cycles. Improvements in tunable uv high repetition rate lasers would expand the range of possible in-cylinder experiments.