Influence of rapid laser heating on differently matured soot with double-pulse laser-induced incandescence

For accurate laser-induced incandescence (LII) measurements of soot properties it is great importance to understand the nature physical processes involved during rapid laser heating. In this work, we investigate how well-characterized differently matured fresh from a generator responds purpose, double-pulse LII setup used with 10 ?s time separation between pulses using various combinations two common wavelengths (532 and 1064 nm). Detection performed at wavelength bands for fluorescence analysis, additionally elastic light scattering mass loss analysis We signal changes pre-heating energy, specifically by fluence curve estimate influence thermal annealing, sublimation interference. It shown that extensive absorption enhancement occurs all types as thermally annealed, which manifested through decreasing dispersion coefficient ? an increasing E(m,?). When comparing young mature soot, much larger impact can be observed in curves soot. Also, observe enhanced contribution when performing 532 nm, suggested originate vaporized carbon fragments aromatic structure. This work further shows potential utilizing arrangements detectability poorly absorbing but also highlights heating on may important avoid interferences diagnostics.