Measurement of the combustion temperature of a solid propellant by the CARS method

To measure the solid-propellant combustion temperature, a procedure was used based on examination of the temperature dependence of the Q-branch of the coherent anti-Stokes Raman scattering (CARS) spectrum due to nitrogen contained in combustion products. The measurements were carried out at a pressure of 4 MPa, under which the spectrum demonstrated a substantial overlap between spectral lines. CARS intensities at two frequencies were registered; their ratio was used to determine the combustion temperature of a stoichiometric ammonium dinitramide–polycaprolacton mixture.