Abstract
Laser induced fluorescence method has been employed for the remote, non-intrusive and instantaneous measurements of the temperature of a fuel droplet burning under microgravity. A fuel droplet doped with naphthalene and TMPD was allowed to burn in a quiescent gaseous environments. The fluorescence emission spectra from a droplet subjected to the nitrogen laser excitation were measured with an image intensified optical multichannel analyzer . All the measurements were done under microgravity generated in a capsule of the MGLAB drop shaft. The results showed that a newly developed diagnostic system was found to be applicable successfully for the non-intrusive droplet thermometry under microgravity. The ratio of fluorescence emission intensities at two different wavelengths was an appropriate criterion for the in-situ determination of droplet temperature. The black radiation from the soot in the flame caused no serious trouble in the thermometry .
