Abstract : The progress made on non-intrusive optical measurements since many years allow the measurement of temperature, species concentration and velocity in turbulent reactive flows. Although these techniques are very powerful, their use is generally restricted to point measurements.
The aim of this thesis consists of the development of new imaging diagnostics which allow the measurement of instantaneous quantitative fields of temperature and concentration. Two complementary directions were explored. The first one concerns the development of the planar laser induced fluorescence of radical OH for the study of the turbulent combustion. The second one is devoted to the planar laser induced fluorescence of a molecular tracer (acetone) for the study of non-reactive turbulent flows. All these studies were performed using a similar approach : after a compilation of bibliographical data, modeling of the laser induced fluorescence on both species were primarily performed. Then, the results of simulation were used to select the best strategy required to develop the quantitative planar laser-induced fluorescence. Finally, several experiments in laboratory (hydrogen – air flame , jet flows, ...) were carried out in order to optimize the optical techniques and characterize the accuracy of the measurement.
Another applications were performed on semi-industrial facilities to characterize their use in very severe conditions. All the results allow to conclude that the instantaneous quantitative planar laser-induced fluorescence is operational in many situations and can lead to two-dimensional instantaneous quantitative measurements of temperature and species concentrations.