Combination with a high temperature combustion chamber and top burner

Claim 1

In combination, a high temperature combustion chamber being the interior of a synthesis gas generator having a thick refractory lining, a downwardly directed burner having two coaxial feed stream conduits at the top of said combustion chamber for introducing feed streams of the constituents of a synthesis gas generation process to be carried out in said synthesis gas generator, said feed stream conduits merging at the outlet ends to form a joint nozzle outlet, and means for transmitting radiant energy for measuring temperature of a predetermined location in said combustion chamber, said radiant energy transmitting means comprising an optical fiber attached to the inside surface of one of said feed stream conduits and having an input end for receiving radiant energy from the interior of said combustion chamber at an angle, means for directing said input end toward the inside of a wall of said combustion chamber so as to receive radiant energy from the interior and at an angle for measuring conditions on the inside of said thick refractory lining, and said optical fiber being located in the path of one of said feed streams inside of said burner.