A method for monitoring a flame in a combustion chamber comprising a wall with an outer side is provided, wherein the radiation which is emitted from a part of the outer side of the wall is optically detected by a sensor. Furthermore, a burner is provided, especially for use in a gas turbine. The burner comprises a wall section with an inner side, which shows towards a combustion zone, and an outer side. The burner further comprises a sensor for optically detecting the radiation emitted from the outer side of said wall section.