This study presents a new experimental methodology to report quantitative measurements of kerosene mole fraction and temperature by combining kerosene-PLIF and OH-PLIF diagnostics. These optical diagnostics are applied simultaneously in a gas turbine model combustion chamber equipped with an Lean Premixed (LP) aero-engine injection system developed by SAFRAN Helicopter Engines (SAFRAN HE), in real operating conditions with pressure up to 1.8 MPa. The method is based on the analysis of kerosene-PLIF images acquired simultaneously on two spectral broadband of collection of the kerosene fluorescence under a 266 nm excitation. To obtain quantitative data, the knowledge of the kerosene fluorescence spectra under a large range of pressure, temperature and oxygen concentration is first determined in a high-pressure cell. An in-situ calibration of the fluorescence signal is then performed in the combustion chamber with operating conditions representative of the kerosene fluorescence signal measured during the experiment. This calibration allows the determination of the kerosene mole fraction accuracy, which is estimated to be better than 12%. Two optical arrangements (axial and radial planes) are finally used to give complementary and previously unseen results. The results highlight the strong correlation between the fuel distribution, the flame topology and the reaction zone intensity.