The stabilization of a premixed methane/air flame in a narrow quartz tube strongly depends on the thermal environment, especially on convective and conductive heat exchanges between walls and gas. First, to determine heat transfer and better understand the stabilization mechanisms of a flame in a narrow channel, but also to obtain boundary conditions for numerical computations, temperature profile measurements are needed. Several methods for temperature measurements are available but since the outer wall, inner wall and gas flow temperature have to be measured, only a few are compatible. The Laser Induced Phosphorescence (LIP) was then selected for its semi-intrusive characteristic and good accuracy. This method is based on the use of thermographic phosphors. Thus the thermographic phosphor YAG:Pr was selected for its large temperature range. It is composed of trivalent praseodymium (Pr3+) ions doped into an yttrium aluminum garnet (YAG) host. In a first step it is bound to the outer wall surface of a 7mm outer diameter cylindrical quartz tube. A premixed methane/air flame is stabilized inside the tube and emission intensity is captured by an ICCD camera. The intensity ratio approach is then used to determine the temperature map of the wall.