Laser modulated particulate incandescence noise effects in laser Raman scattering diagnostics

The following problem has been encountered in laser Raman thermometry experiments performed on model combustors. Particulates in the flow absorb laser radiation and heat to temperatures far in excess of the local stream value. Due to the strong sensitivity of incandescence with temperature, the particulate radiation increases substantially and nearly in phase with the laser pulses, precluding the use of phase sensitive discrimination techniques.