Here the generic high-power combustor test rig developed in the DESIRE project will be used. The burner has optical access to the flame area and to the vibrating liner. It will be modified for this project to operate in an unstable mode. Training will be given in how to measure pressure fields, the velocity of the wall vibrations and the concentration of radicals in the flame. The methods to be used are LIF, chemiluminescence and laser-Doppler velocimetry.