Laser-induced incandescence (LII) was used to quantify the soot volume fraction in five piloted turbulent non-premixed C2H4-N2 jet flames at elevated pressures. In one series of flames, bulk velocity held constant as pressure increased from 1 bar (Re = 10,000) 3 30,000), and then 5 50,000). other series, a Reynolds number 10,000 bar, bar. LII measurements were calibrated with laminar diffusion ...