Laminar acetylene/air diffusion flame stabilized on a 15 mm diameter co-flow burner and pulsed at 1 Hz.

5W Argon Ion laser sheet.

Mie Scattering image shows that soot is present in thin streaks suggesting that peak soot volume fractions are present in a narrow mixture fraction range.

Photograph is also on display at the Building and Fire Research Laboratory, National Institute of Standards and Technology.

10 msec exposure on 1600 ASA film, with no filters.