TEMPERATURE PROFILE CALCULATION FROM EMISSION SPECTROSCOPY MEASUREMENTS IN NITROMETHANE SUBMITTED TO PLATE IMPACTS

A time-resolved emission spectroscopy technique has been developed for spectral analysis of NM submitted to plate impact in the spectral range 0.3-0.85 µm. It enables to obtain the optical characteristics of the different phases of the shock to detonation transition of NM. The emission spectra obtained clearly show the semi-transparency of the media involved. An absorption model of a carbon particles and water vapor mixture is studied in order to explain the radiance measurements. The determination of temperature profiles is carried out with the resolution of the equation of radiative transfer by an inversion method.