Patent ID: 8506161

Claim:
A method of making a non-contact temperature measurement of a target in a processing chamber comprising: measuring a temperature of a reference target in the processing chamber; measuring a first temperature of a stray blackbody source; measuring a reflectance of the reference target; and replacing the reference target with the target; and performing a non-contact temperature measurement of the target in the processing chamber by: measuring a second temperature of the stray blackbody source; measuring a reflectance of the target by: emitting a light beam incident on the target, where the light beam has a first intensity; detecting a reflected portion of the light beam reflected off the target, where the reflected portion has a second intensity; calculating the reflectance of the target, as the second intensity divided by the first intensity; and calculating a temperature of the target using at least the first temperature of the stray blackbody source, the second temperature of the stray blackbody source, the temperature of the reference target, the reflectance of the reference target, and the reflectance of the target.