Patent ID: 8873053

Claim:
A method for determining at least one gas condition at a location in a combustion chamber of a power plant or a combined heat and power plant by means of a laser pulse, the method comprising: emitting (S 1 ) the laser pulse into the chamber, determining (S 2 ) a first point of time at which the laser pulse is emitted into the chamber, detecting (S 3 ) laser light backscattered by gas molecules at the location in the chamber, determining (S 4 ) a second point of time at which the laser light backscattered by the gas molecules is detected, determining (S 5 ) the location based on the first point of time, the second point of time, and a pulse length of the laser pulse, and determining (S 6 ) the at least one gas condition at the location based on at least one characteristic of the backscattered laser light detected at the second point of time.